Nabble - Python - image-sig

Re: PIL installation on Snow Leopard

2009-12-21T10:22:35Z

Christopher Brewster wrote:
> On a clean install on Snow Leopard, I have installed:

I don't have snow leopard, so I can't test anything , but a few comments:

> - python 2.6.4 using the Mac installer on python.org
> - In accordance with instructions here: http://stackoverflow.com/questions/1438270/installing-python-imaging-library-pil-on-snow-leopard-with-updated-python-2-6-2
> I issues the command export CC=/usr/bin/gcc-4.0

note that those instructions were written for 2.6.2 -- I think 2.6.4 may
do the right thing without that command. I'd try it.

> and now PIL but I get the following errors which I do not know how to interpret:
> ----
> Compiling with an SDK that doesn't seem to exist: /Developer/SDKs/MacOSX10.4u.sdk

well, do you have:

/Developer/SDKs/MacOSX10.4u.sdk

I suspect not. I think it's an optional install with XCode (you did
install XCode, didn't you?)

I think this is your show-stopper -- try going back to however you
installed XCode,a nd look for a box to check to install the 10.4u SDK.

If this doesn't work, I'd try the pythonmac list.

HTH,

-Chris

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Re: Fwd: Inverse of QUAD transform?

2009-12-21T07:05:49Z

Well, obviously it should be possible to pick some minimal target rectangle
containing the target quad, and then the problem reduces to that of finding a
source quad around the source rectangle in such a way that mapping it to the
target rectangle will also map the source rectangle to the target quad :)

Laura & Edward Cannon wrote:

> ---------- Forwarded message ----------
> From: Laura& Edward Cannon<cannon.el@...>
>
> [...] There is not an anti-quad however.
>
> On Fri, Nov 27, 2009 at 9:50 AM, Mark Wendell<mark.wendell@...> wrote:
>> The docs say that the QUAD image transform takes a quadrilateral
>> defined by an 8-tuple, and transforms it to a rectangle of the
>> provided 'size'.
>>
>> I need the inverse of that: I need to take a rectangular region, and
>> warp it to an arbitrary quad. Is there a way to do that?
>>
>> thanks
>> Mark
>> --
>> --
>> Mark Wendell
>> _______________________________________________
>> Image-SIG maillist - Image-SIG@...
>> http://mail.python.org/mailman/listinfo/image-sig
>>
> _______________________________________________
> Image-SIG maillist - Image-SIG@...
> http://mail.python.org/mailman/listinfo/image-sig
>

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PIL installation on Snow Leopard

2009-12-20T08:17:08Z

(my apologies in advance)

On a clean install on Snow Leopard, I have installed:
- python 2.6.4 using the Mac installer on python.org
- In accordance with instructions here: http://stackoverflow.com/questions/1438270/installing-python-imaging-library-pil-on-snow-leopard-with-updated-python-2-6-2
I issues the command export CC=/usr/bin/gcc-4.0

- libjpeg as per http://proteus-tech.com/blog/cwt/install-pil-in-snow-leopard/
- Freetype2 as per their website http://www.freetype.org/index2.html

and now PIL but I get the following errors which I do not know how to interpret:
----
Compiling with an SDK that doesn't seem to exist: /Developer/SDKs/MacOSX10.4u.sdk
Please check your Xcode installation
gcc-4.0 -arch ppc -arch i386 -isysroot /Developer/SDKs/MacOSX10.4u.sdk -g -bundle -undefined dynamic_lookup build/temp.macosx-10.3-fat-2.6/_imagingtk.o build/temp.macosx-10.3-fat-2.6/Tk/tkImaging.o -L/usr/local/lib -L/Library/Frameworks/Python.framework/Versions/2.6/lib -L/usr/lib -o build/lib.macosx-10.3-fat-2.6/_imagingtk.so -framework Tcl -framework Tk
ld: framework not found Tcl
collect2: ld returned 1 exit status
ld: framework not found Tcl
collect2: ld returned 1 exit status
lipo: can't open input file: /var/folders/Md/Md7dPPzaGPGQNU+9szQi3++++TI/-Tmp-//cc9P9TtC.out (No such file or directory)
error: command 'gcc-4.0' failed with exit status 1
----

Any advice would be appreciated.

Christopher

*****************************************************
Operations and Information Management Group,
Aston Business School, Aston University,
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Re: Is PIL 1.1.7 final "official"

2009-12-11T16:46:40Z

Yeah, 1.1.7 is official; it's just me having accidentally skipped a
couple of steps in the release procedure. Will fix asap. Sorry for
the confusion.

</F>

On Wed, Dec 9, 2009 at 5:43 AM, Steven Watanabe
<Steven.Watanabe@...> wrote:

> I see that PIL 1.1.7 final has been released:
>
> http://offline.effbot.org/ann-pil-117-november-15-2009
>
> However, PyPI and the PIL websites still point to 1.1.6:
>
> http://effbot.org/zone/pil-index.htm
> http://www.pythonware.com/products/pil/
>
> My question: is this release "official"?
> _______________________________________________
> Image-SIG maillist - Image-SIG@...
> http://mail.python.org/mailman/listinfo/image-sig
>

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Re: bug in PIL 1.1.7 Image.split()

2009-12-10T14:55:32Z

Good catch. The breakage is caused by a 1.1.7 fix that treats
single-band images as a special case; unfortunately, the fix checks
that attribute before actually loading the image... I'll provide a
patch later, but you can of course work around it by adding an
explicit load to your code.

Thanks /F

On Thu, Dec 10, 2009 at 10:48 AM, Bill Janssen <janssen@...> wrote:

> Just stumbled over this bug. Shouldn't split() do a load() first? This
> used to work in 1.1.6.
>
> Bill
>
> % python
> Python 2.5.1 (r251:54863, Feb 6 2009, 19:02:12)
> [GCC 4.0.1 (Apple Inc. build 5465)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import Image
>>>> Image.VERSION
> '1.1.7'
>>>> im = Image.open("/u/extensions/vCardParser/vcardimage.png")
>>>> im.mode
> 'RGBA'
>>>> im.size
> (200, 138)
>>>> im.split()
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> File "/Library/Python/2.5/site-packages/PIL/Image.py", line 1497, in split
> if self.im.bands == 1:
> AttributeError: 'NoneType' object has no attribute 'bands'
>>>>
> _______________________________________________
> Image-SIG maillist - Image-SIG@...
> http://mail.python.org/mailman/listinfo/image-sig
>

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bug in PIL 1.1.7 Image.split()

2009-12-10T10:48:08Z

Just stumbled over this bug. Shouldn't split() do a load() first? This
used to work in 1.1.6.

Bill

% python
Python 2.5.1 (r251:54863, Feb 6 2009, 19:02:12)
[GCC 4.0.1 (Apple Inc. build 5465)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import Image
>>> Image.VERSION
'1.1.7'
>>> im = Image.open("/u/extensions/vCardParser/vcardimage.png")
>>> im.mode
'RGBA'
>>> im.size
(200, 138)
>>> im.split()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/Library/Python/2.5/site-packages/PIL/Image.py", line 1497, in split
if self.im.bands == 1:
AttributeError: 'NoneType' object has no attribute 'bands'
>>>
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Image.split broken when image file isn't loaded

2009-12-09T06:51:22Z

Hi,

Image.split appears to be broken when the image file isn't loaded first.

My testcase is:

>>> from PIL import Image
>>> x = Image.open('test.png')
>>> x.split()
[..]
AttributeError: 'NoneType' object has no attribute 'bands'

I think Image.point was broken in the same way recently; the client
workaround of calling Image.load works here too.

Patch attached.

Regards,

--
,''`.
: :' : Chris Lamb
`. `'` lamby@...
`-

diff -urNad python-imaging-1.1.7.orig/PIL/Image.py python-imaging-1.1.7/PIL/Image.py --- python-imaging-1.1.7.orig/PIL/Image.py 2009-12-09 14:37:37.000000000 +0000 +++ python-imaging-1.1.7/PIL/Image.py 2009-12-09 14:38:13.000000000 +0000 @@ -1494,11 +1494,12 @@ def split(self): "Split image into bands" + self.load() + if self.im.bands == 1: ims = [self.copy()] else: ims = [] - self.load() for i in range(self.im.bands): ims.append(self._new(self.im.getband(i))) return tuple(ims)

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Is PIL 1.1.7 final "official"

2009-12-09T05:43:30Z

I see that PIL 1.1.7 final has been released:

http://offline.effbot.org/ann-pil-117-november-15-2009

However, PyPI and the PIL websites still point to 1.1.6:

http://effbot.org/zone/pil-index.htm
http://www.pythonware.com/products/pil/

My question: is this release "official"?
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Re: quick pixelwise euclidean difference

2009-12-07T10:45:30Z

Lauri Love (nsh) wrote:
> Let me know if there is any faster solution short of coding in some
> distance functions to the C modules

You might do better with numpy and/or scipy.ndimage.

You can convert a PIL RGB image to a numpy array very easily. I think
it's as simple as:

import numpy as np

arr = np.asarray(pil_image)

Then you have a WxHx3 array of uint8 values you can do all sorts of math on.

-Chris

--
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Emergency Response Division
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Re: quick pixelwise euclidean difference

2009-12-05T15:47:16Z

Ok, I found a reasonable solution using the ImageStat module to get the sum of pixels of the difference image. This gives the manhattan distance when divided by the pixel count and averaged over RGB.

In [151]: def idiff(im1,im2):

return array(ImageStat.Stat(ImageChops.difference(im1,im2)).sum).mean()/(im1.size[0] * im1.size[1])

.....:

In [153]: timeit("idiff(anna,f37)",20)

Out[153]: 0.023978149890899657

Let me know if there is any faster solution short of coding in some distance functions to the C modules (which I did consider, before be reminded of my pitiful ignorance...)

Yours,

-nsh

On Sat, Dec 5, 2009 at 7:56 PM, Lauri Love (nsh) <lauri.love@...> wrote:

i'm coding a project which requires quick comparison of two images per pixel by colorspace (distance is the sum of the squares of the differences of RGB values over the pixels of the images), as a fitness function (i am trying to recreate/extend roger alsing's genetic mona lisa code in python).

creating an absolute difference image takes about 1/100th of a second on my (eeepc) hardware, but i can't figure out a way to reduce the difference image to an integer of float value quickly. it takes about the order of 5 seconds to iterate through all the pixels and sum the RGB values to get the manhattan distance. "manually" calculating the manhattan or euclidean distances between the two images is even slower.

can anyone suggest a way to quickly get either distance from two images?

sincerely and gratefully,

-nsh

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quick pixelwise euclidean difference

2009-12-05T11:56:57Z

i'm coding a project which requires quick comparison of two images per pixel by colorspace (distance is the sum of the squares of the differences of RGB values over the pixels of the images), as a fitness function (i am trying to recreate/extend roger alsing's genetic mona lisa code in python).

creating an absolute difference image takes about 1/100th of a second on my (eeepc) hardware, but i can't figure out a way to reduce the difference image to an integer of float value quickly. it takes about the order of 5 seconds to iterate through all the pixels and sum the RGB values to get the manhattan distance. "manually" calculating the manhattan or euclidean distances between the two images is even slower.

can anyone suggest a way to quickly get either distance from two images?

sincerely and gratefully,

-nsh

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Can't install on Snow Leopard

2009-12-02T19:27:36Z

Hello,

I have installed Python from Python.org and have set my environment variables as to use it in default instead of the system Python. I am unable to install PIL however. Trying to build from the downloaded package or using easy_install produces the following error:

lipo: can't open input file: /var/tmp//ccmUAK0V.out (No such file or directory)
error: Setup script exited with error: command 'gcc-4.0' failed with exit status 1

Any ideas?

Regards,
Xiao
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Re: XPM

2009-12-01T17:25:20Z

Hi Ivan,

As far as I can see, there has been no new version of PIL since I submitted this patch to the list.

Be aware that even with the patch, the handling of XPM files is not 100% complete. In particular, PIL does not handle XPM files which use more than one character per pixel (those with more than about 90 or 100 colours in the palette).

--
Tom.

Ivan Van Laningham wrote:

Hi All--
I ran across Tom Heathcotes patches for PIL 1.1.6 to handle XPM files
correctly.  Is there a version of PIL available that includes the
fixes?  I've got several hundred XPMs I'd like to convert to PNGs.

Thanks!

Metta,
Ivan

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Re: What's wrong with this TIF ... IOError("cannot identify image file")

2009-12-01T01:13:44Z

Hi Florian - Thank you *very* much. That did the trick, your help is
much appreciated - this one really had me scratching my head !

thanks again.

Richard.

On Mon, 30 Nov 2009 14:14:19 +0100, "Florian Höch"
<lists+Image_SIG@...> said:

> Hi, it has nothing to do with missing TIFF headers.
>
> > TIFFDUMP OUTPUT FOR THE SECOND FILE
> > ===================================
> > BitsPerSample (258) SHORT (3) 4<16 16 16 16>
>
> PIL can't process 16-bit/channel images. You can use -depth 8
> option in your ImageMagick commandline to force 8-bit/channel output
> (as the original image is also 8-bit, I assume you use the Q16 version
> of ImageMagick which always converts to 16-bit for supported fileformats
> on output if you don't tell it otherwise).
>
> Regards,
>
> Florian Höch
>
>
>
> _______________________________________________
> Image-SIG maillist - Image-SIG@...
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Re: Example Code for Displaying Pictures--I'm Stumped

2009-11-30T10:51:14Z

I now have a detailed description of the file, but the smallest file I
can find is 1.7M. I don't think I can go lower. It probably contains 90
128x128 frames plus the 640x480. I suppose if there's some tool in Win,
I could just cut it at some place to shorten it. Tomorrow I'm going out
of town, but should be on the web mail. I'll have my laptop, and many of
these files are on it, so I might be able to do some work on this.

Wayne Watson wrote:

> Thanks. I'll try to follow up on this soon.
>
> Bill Janssen wrote:
>> Another good option is pyglet. I use it for converting video to streams
>> of PIL images.
>>
>> Here's the code for turning a pyglet image into a PIL image:
>>
>> def pyglet_to_pil_image (pyglet_image):
>> image = pyglet_image.get_image_data()
>> format = image.format
>> if format != 'RGB':
>> # Only save in RGB or RGBA formats.
>> format = 'RGBA'
>> pitch = -(image.width * len(format))
>>
>> # Note: Don't try and use frombuffer(..); different versions of
>> # PIL will orient the image differently.
>> pil_image = Image.fromstring(
>> format, (image.width, image.height),
>> image.get_data(format, pitch))
>> # need to flip the image to accommodate Pyglet's transform space
>> pil_image = pil_image.transpose(Image.FLIP_TOP_BOTTOM)
>> return pil_image
>>
>> This code is part of extensions/video.py, part of the UpLib source code
>> at http://uplib.parc.com/.
>>
>> Bill
>>
>>
>

--
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(121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
Obz Site: 39° 15' 7" N, 121° 2' 32" W, 2700 feet

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of pedifiles that prowl the web is 50,00. There are no
figures that support this. The number of children below
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or 115 per year. -- The Science of Fear by D. Gardner

Web Page: <www.speckledwithstars.net/>

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Re: What's wrong with this TIF ... IOError("cannot identify image file")

2009-11-30T05:14:19Z

Hi, it has nothing to do with missing TIFF headers.

> TIFFDUMP OUTPUT FOR THE SECOND FILE
> ===================================
> BitsPerSample (258) SHORT (3) 4<16 16 16 16>

PIL can't process 16-bit/channel images. You can use -depth 8
option in your ImageMagick commandline to force 8-bit/channel output
(as the original image is also 8-bit, I assume you use the Q16 version
of ImageMagick which always converts to 16-bit for supported fileformats
on output if you don't tell it otherwise).

Regards,

Florian Höch

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What's wrong with this TIF ... IOError("cannot identify image file")

2009-11-30T01:17:50Z

Hi - I have a TIF which when I am try to read it with PIL I get
'IOError("cannot identify image file")'.

In it's original form PIL can read it. I then use ImageMagick to change
it's colour managment from RGB to CMYK (script A at bottom of email
shows the windows BAT files used). At that stage PIL won't read the
output. The output of TIFFDUMP applied to that image
(ZENDGraphOutput-Step1.TIF) is shown below.

However I read in an earlier post
(http://mail.python.org/pipermail/image-sig/2008-November/005263.html)
that some TIF headers are needed by PIL which are sometimes lost by
intermediate process so I used ImageMagick and TIFFSET to put them back
in place (script B at bottom of email). Unfortunately even after that
PIL won't read it. The output of TIFFDUMP applied to that image
(ZENDGraphOutput-Step2.TIF) is also shown below.

Is there anyone out there who can see why PIL is choking on this TIF ? I
would be grateful for any advice.

TIFFDUMP OUTPUT FOR THE FIRST FILE
==================================
C:\20091130>C:\bin\installed\GnuWin32\bin\tiffdump.exe
"C:\20091130\OutputImages\ZENDGraphOutput-Step1.TIF"
C:\20091130\OutputImages\ZENDGraphOutput-Step1.TIF:
Magic: 0x4949 <little-endian> Version: 0x2a
Directory 0: offset 374842 (0x5b83a) next 0 (0)
ImageWidth (256) SHORT (3) 1<1600>
ImageLength (257) SHORT (3) 1<981>
BitsPerSample (258) SHORT (3) 5<8 8 8 8 8>
Compression (259) SHORT (3) 1<5>
Photometric (262) SHORT (3) 1<5>
FillOrder (266) SHORT (3) 1<1>
DocumentName (269) ASCII (2) 84<C:\usr\obfuscated ...>
StripOffsets (273) LONG (4) 981<8 327 646 965 1284 1603 1922 2241 2560
2879 3198 3517 3836 4155 4474 4793 5112 5431 5750 6069 6388 6707 7026
7345 ...>
Orientation (274) SHORT (3) 1<1>
SamplesPerPixel (277) SHORT (3) 1<5>
RowsPerStrip (278) SHORT (3) 1<1>
StripByteCounts (279) LONG (4) 981<319 319 319 319 319 319 319 319 319
319 319 319 319 319 319 319 319 319 319 319 319 319 319 319 ...>
XResolution (282) RATIONAL (5) 1<96>
YResolution (283) RATIONAL (5) 1<96>
PlanarConfig (284) SHORT (3) 1<1>
ResolutionUnit (296) SHORT (3) 1<2>
Software (305) ASCII (2) 58<ImageMagick 6.3.4 05/11/ ...>
InkSet (332) SHORT (3) 1<1>
ExtraSamples (338) SHORT (3) 1<2>

TIFFDUMP OUTPUT FOR THE SECOND FILE
===================================
C:\20091130>C:\bin\installed\GnuWin32\bin\tiffdump.exe
"C:\20091130\OutputImages\ZENDGraphOutput-Step2.TIF"
C:\20091130\OutputImages\ZENDGraphOutput-Step2.TIF:
Magic: 0x4949 <little-endian> Version: 0x2a
Directory 0: offset 309338 (0x4b85a) next 0 (0)
ImageWidth (256) SHORT (3) 1<1600>
ImageLength (257) SHORT (3) 1<981>
BitsPerSample (258) SHORT (3) 4<16 16 16 16>
Compression (259) SHORT (3) 1<5>
Photometric (262) SHORT (3) 1<5>
FillOrder (266) SHORT (3) 1<1>
DocumentName (269) ASCII (2) 84<C:\usr\obfuscated ...>
StripOffsets (273) LONG (4) 981<8 191 374 557 740 923 1106 1289 1472
1655 1838 2021 2204 2387 2570 2753 2936 3119 3302 3485 3668 3851 4034
4217 ...>
Orientation (274) SHORT (3) 1<1>
SamplesPerPixel (277) SHORT (3) 1<4>
RowsPerStrip (278) SHORT (3) 1<1>
StripByteCounts (279) LONG (4) 981<183 183 183 183 183 183 183 183 183
183 183 183 183 183 183 183 183 183 183 183 183 183 183 183 ...>
XResolution (282) RATIONAL (5) 1<96>
YResolution (283) RATIONAL (5) 1<96>
PlanarConfig (284) SHORT (3) 1<1>
ResolutionUnit (296) SHORT (3) 1<2>
Software (305) ASCII (2) 7<Banana\0>
InkSet (332) SHORT (3) 1<1>

SCRIPT A
========
@echo off
set ICCCOLPROFDIR=C:\Adobe_ICC_Profiles_bundler
set IMGINPUTDIR=C:\20091130
set IMGOUTPUTDIR=C:\20091130\OutputImages
set CONVERTEXE=C:\ImageMagick\convert.exe
@echo off
REM Convert the TIFF Produced directly from the ZendGraph output
set INPUTFILE=ZENDGraphOutput.TIFF
set OUTPUTFILE=ZENDGraphOutput-Step1.TIF
@echo on
%CONVERTEXE% %IMGINPUTDIR%\%INPUTFILE% +profile icc -profile
%ICCCOLPROFDIR%\RGBProfiles\AdobeRGB1998.icc -profile
%ICCCOLPROFDIR%\CMYKProfiles\USWebCoatedSWOP.icc -strip
%IMGOUTPUTDIR%\%OUTPUTFILE%
@echo off

SCRIPT B
========
@echo off
set CONVERTEXE=C:\ImageMagick\convert.exe
set IMGDIR=C:\20091130\OutputImages
set TIFFSETEXE=C:\bin\installed\GnuWin32\bin\tiffset.exe
@echo off
REM Convert the TIFF Produced directly from the ZendGraph output
set INPUTFILE=ZENDGraphOutput-Step1.TIF
set INTERMEDIATEFILE=ZENDGraphOutput-Step2.TIF
@echo on
%CONVERTEXE% %IMGDIR%\%INPUTFILE% -flatten +matte
%IMGDIR%\%INTERMEDIATEFILE%
@echo off
%TIFFSETEXE% -s 305 Banana %IMGDIR%\%INTERMEDIATEFILE%
%TIFFSETEXE% -s 296 2 %IMGDIR%\%INTERMEDIATEFILE%
%TIFFSETEXE% -s 282 96 %IMGDIR%\%INTERMEDIATEFILE%
%TIFFSETEXE% -s 283 96 %IMGDIR%\%INTERMEDIATEFILE%
@echo off
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Re: Problem with optimize flag and GIF encoder

2009-11-29T17:26:40Z

It is listed under 1.2a3/1.2b1 here:
http://effbot.org/zone/pil-changes-113.htm

But you're right, I might suggest they generate png thumbnails instead.

Ian

Fredrik Lundh wrote:

> Hmm. PIL doesn't officially support "optimize" for GIF files:
>
> http://effbot.org/imagingbook/format-gif.htm
>
> so maybe this is some partially implemented feature that's been hiding
> in there for ages. I'm not sure GIF is such a great format for
> thumbnails anyway; maybe the toolkit should be tweaked to render any
> 8-bit thumbnail as PNG instead?
>
> </F>
>
> On Sat, Nov 28, 2009 at 5:44 AM, Ian Ward <ian@...> wrote:
>> Hello,
>>
>> I am running python 2.5 and PIL 1.1.6 on Debian Lenny, and I've found
>> that using the optimize flag when creating GIF files can create invalid
>> images. An example:
>>
>>>>> im = Image.new('RGB', (20,44))
>>>>> im.save('test.gif', optimize=True)
>>>>> im2 = Image.open('test.gif')
>> Traceback (most recent call last):
>> File "<stdin>", line 1, in <module>
>> File "/usr/lib/python2.5/site-packages/PIL/Image.py", line 1917, in open
>> raise IOError("cannot identify image file")
>> IOError: cannot identify image file
>> I came across this problem using django-filebrowser, which has
>> optimize=True as a default for creating thumbnails of all image formats..
>>
>> Ian
>>
>> (sorry if this message gets posted twice, I'm resending 20h after my
>> first attempt)
>> _______________________________________________
>> Image-SIG maillist - Image-SIG@...
>> http://mail.python.org/mailman/listinfo/image-sig
>>

_______________________________________________
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Re: Problem with optimize flag and GIF encoder

2009-11-29T15:06:14Z

Hmm. PIL doesn't officially support "optimize" for GIF files:

http://effbot.org/imagingbook/format-gif.htm

so maybe this is some partially implemented feature that's been hiding
in there for ages. I'm not sure GIF is such a great format for
thumbnails anyway; maybe the toolkit should be tweaked to render any
8-bit thumbnail as PNG instead?

</F>

On Sat, Nov 28, 2009 at 5:44 AM, Ian Ward <ian@...> wrote:

> Hello,
>
> I am running python 2.5 and PIL 1.1.6 on Debian Lenny, and I've found
> that using the optimize flag when creating GIF files can create invalid
> images. An example:
>
>>>> im = Image.new('RGB', (20,44))
>>>> im.save('test.gif', optimize=True)
>>>> im2 = Image.open('test.gif')
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> File "/usr/lib/python2.5/site-packages/PIL/Image.py", line 1917, in open
> raise IOError("cannot identify image file")
> IOError: cannot identify image file
>>>>
>
> I came across this problem using django-filebrowser, which has
> optimize=True as a default for creating thumbnails of all image formats.
>
> Ian
>
> (sorry if this message gets posted twice, I'm resending 20h after my
> first attempt)
> _______________________________________________
> Image-SIG maillist - Image-SIG@...
> http://mail.python.org/mailman/listinfo/image-sig
>

_______________________________________________
Image-SIG maillist - Image-SIG@...
http://mail.python.org/mailman/listinfo/image-sig

Problem with optimize flag and GIF encoder

2009-11-28T05:44:08Z

Hello,

I am running python 2.5 and PIL 1.1.6 on Debian Lenny, and I've found
that using the optimize flag when creating GIF files can create invalid
images. An example:

>>> im = Image.new('RGB', (20,44))
>>> im.save('test.gif', optimize=True)
>>> im2 = Image.open('test.gif')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python2.5/site-packages/PIL/Image.py", line 1917, in open
raise IOError("cannot identify image file")
IOError: cannot identify image file
>>>

I came across this problem using django-filebrowser, which has
optimize=True as a default for creating thumbnails of all image formats.

Ian

(sorry if this message gets posted twice, I'm resending 20h after my
first attempt)
_______________________________________________
Image-SIG maillist - Image-SIG@...
http://mail.python.org/mailman/listinfo/image-sig

Fwd: Inverse of QUAD transform?

2009-11-27T11:48:18Z

---------- Forwarded message ----------
From: Laura & Edward Cannon <cannon.el@...>
Date: Fri, Nov 27, 2009 at 11:48 AM
Subject: Re: [Image-SIG] Inverse of QUAD transform?
To: Mark Wendell <mark.wendell@...>

there is a (undocumented) perspective method that might do what you
want. as I recall
http://mail.python.org/pipermail/image-sig/2005-February/003198.html
is the documentation. There is not an anti-quad however.

On Fri, Nov 27, 2009 at 9:50 AM, Mark Wendell <mark.wendell@...> wrote:

> The docs say that the QUAD image transform takes a quadrilateral
> defined by an 8-tuple, and transforms it to a rectangle of the
> provided 'size'.
>
> I need the inverse of that: I need to take a rectangular region, and
> warp it to an arbitrary quad. Is there a way to do that?
>
> thanks
> Mark
> --
> --
> Mark Wendell
> _______________________________________________
> Image-SIG maillist - Image-SIG@...
> http://mail.python.org/mailman/listinfo/image-sig
>

_______________________________________________
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http://mail.python.org/mailman/listinfo/image-sig

Inverse of QUAD transform?

2009-11-27T09:50:17Z

The docs say that the QUAD image transform takes a quadrilateral
defined by an 8-tuple, and transforms it to a rectangle of the
provided 'size'.

I need the inverse of that: I need to take a rectangular region, and
warp it to an arbitrary quad. Is there a way to do that?

thanks
Mark
--
--
Mark Wendell
_______________________________________________
Image-SIG maillist - Image-SIG@...
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Problem with optimize flag and GIF encoder

2009-11-27T08:34:04Z

Hello,

I am running python 2.5 and PIL 1.1.6 on Debian Lenny, and I've found
that using the optimize flag when creating GIF files can create invalid
images. An example:

>>> im = Image.new('RGB', (20,44))
>>> im.save('test.gif', optimize=True)
>>> im2 = Image.open('test.gif')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python2.5/site-packages/PIL/Image.py", line 1917, in open
raise IOError("cannot identify image file")
IOError: cannot identify image file
>>>

I came across this problem using django-filebrowser, which has
optimize=True as a default for creating thumbnails of all image formats.

Ian

_______________________________________________
Image-SIG maillist - Image-SIG@...
http://mail.python.org/mailman/listinfo/image-sig

Re: resizing an image with alphachannel: dirty edges

2009-11-27T06:59:23Z

Thank you!
It's works fine!

2009/11/20 Alexey Borzenkov <snaury@...>

On Thu, Nov 12, 2009 at 3:59 PM, Ivan Elchin <ivangermes@...> wrote:
> I have a problem, when i resizing an image with alphachannel.

You can try converting your image to RGBa (premultiplied alpha),
resizing it, then converting back to RGBA. The problem here is that
there are dirty pixels with 0 alpha, and they get interpolated like
everything else. On my PIL this works:

from PIL import Image

im = Image.open("sega.png")

im = im.convert("RGBa")

cur_width, cur_height = im.size
new_width, new_height = (200, 200)

if not new_width == 0 and not new_height == 0:
ratio = min(float(new_width)/cur_width,
float(new_height)/cur_height)
else:
if new_width == 0:
ratio = float(new_height)/cur_height
else:
ratio = float(new_width)/cur_width

new_dimensions = (int(round(cur_width*ratio)),
int(round(cur_height*ratio)))

new_im = im.resize(new_dimensions, Image.ANTIALIAS)

new_im = new_im.convert("RGBA")

new_im.save('rez.png')

Though my PIL has many modifications, I'm not sure if RGBA->RGBa->RGBA
is implemented in vanilla 1.1.6. (after checking) Ah, yes, it's not.
Though you can try recompiling PIL with this patch:
http://git.kitsu.ru/patched/pil.git?a=commitdiff;h=b8f1c572430b06b5d4294fb2bf29327275120554

_______________________________________________
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Re: had to hack setup.py to find tk.h

2009-11-26T08:50:25Z

Which versions of PIL and Ubuntu? (I'm pretty sure I built this
successfully on 9.10.)

</F>

On Thu, Nov 26, 2009 at 3:57 PM, Michael P. Soulier
<msoulier@...> wrote:

> Hi,
>
> I'm on an Ubuntu system and I had to add this to setup.py to get PIL to
> build with the Tk extension.
>
> add_directory(include_dirs, "/usr/include/tk")
>
> as tk.h is not in /usr/include
>
> Cheers,
> Mike
> --
> Michael P. Soulier <msoulier@...>
> "Any intelligent fool can make things bigger and more complex... It
> takes a touch of genius - and a lot of courage to move in the opposite
> direction." --Albert Einstein
>
> _______________________________________________
> Image-SIG maillist - Image-SIG@...
> http://mail.python.org/mailman/listinfo/image-sig
>
>

_______________________________________________
Image-SIG maillist - Image-SIG@...
http://mail.python.org/mailman/listinfo/image-sig

had to hack setup.py to find tk.h

2009-11-26T06:57:35Z

Hi,

I'm on an Ubuntu system and I had to add this to setup.py to get PIL to
build with the Tk extension.

add_directory(include_dirs, "/usr/include/tk")

as tk.h is not in /usr/include

Cheers,
Mike
--
Michael P. Soulier <msoulier@...>
"Any intelligent fool can make things bigger and more complex... It
takes a touch of genius - and a lot of courage to move in the opposite
direction." --Albert Einstein

_______________________________________________
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attachment0 (195 bytes) Download Attachment

Re: Example Code for Displaying Pictures--I'm Stumped

2009-11-26T06:45:30Z

Thanks. I'll try to follow up on this soon.

Bill Janssen wrote:

> Another good option is pyglet. I use it for converting video to streams
> of PIL images.
>
> Here's the code for turning a pyglet image into a PIL image:
>
> def pyglet_to_pil_image (pyglet_image):
> image = pyglet_image.get_image_data()
> format = image.format
> if format != 'RGB':
> # Only save in RGB or RGBA formats.
> format = 'RGBA'
> pitch = -(image.width * len(format))
>
> # Note: Don't try and use frombuffer(..); different versions of
> # PIL will orient the image differently.
> pil_image = Image.fromstring(
> format, (image.width, image.height), image.get_data(format, pitch))
> # need to flip the image to accommodate Pyglet's transform space
> pil_image = pil_image.transpose(Image.FLIP_TOP_BOTTOM)
> return pil_image
>
> This code is part of extensions/video.py, part of the UpLib source code
> at http://uplib.parc.com/.
>
> Bill
>
>

--
Wayne Watson (Watson Adventures, Prop., Nevada City, CA)

(121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
Obz Site: 39° 15' 7" N, 121° 2' 32" W, 2700 feet

350 350 350 350 350 350 350 350 350 350
Make the number famous. See 350.org
The major event has passed, but keep the number alive.

Web Page: <www.speckledwithstars.net/>

_______________________________________________
Image-SIG maillist - Image-SIG@...
http://mail.python.org/mailman/listinfo/image-sig

Re: Example Code for Displaying Pictures--I'm Stumped

2009-11-26T06:44:52Z

Thanks. Unfortunately, the fellow that can answer my question left early
yesterday, so I won't know exactly the file's structure until Monday.

Christopher Barker wrote:

> Wayne Watson wrote:
>> I didn't know I could post, attach I guess, here. I'll do that later.
>
> as long as it's a small file -- it can be much easier to help
>
>> There is one puzzling format difficulty I have with the file that
>> requires some attention. I hope to have that cleared up in the next
>> hour or two. Actually, there's a twist in the format that should be
>> mentioned. The first image (frame) is 640x480, and I'm pretty sure
>> one byte per pixel. However, every other image (frame) after that is
>> 128 pixels square. An auxiliary text file provides where, x and y
>> pixel position, the small image should be pasted to form a complete
>> image with the 640x480 frame.
>
> Maybe it's because I"m more familiar with numpy than PIL, but this is
> how I'd do that (untested, of course...):
>
> import numpy as np
>
> infile = file('filename')
>
> img = np.fromfile(infile, count=640*480, dtype=np.uint8)
>
>
> for i in range(num_images):
> do_something
> small_image = np.fromfile(infile, count=128*128, dtype=np.uint8)
> img[x:x+128, y:y+128] = small_image
> ....
>
> NOTE: np.histogram2d might do what you want for the histogram
>
>
> I'm sure you can do somethign similar directly with PIL.
>
> -Chris
>
>
>
>
>
>
>
>

Re: Example Code for Displaying Pictures--I'm Stumped

2009-11-26T00:37:04Z

On Thu, Nov 26, 2009 at 3:05 AM, Bill Janssen <janssen@...> wrote:

> # Note: Don't try and use frombuffer(..); different versions of
> # PIL will orient the image differently.
> pil_image = Image.fromstring(
> format, (image.width, image.height), image.get_data(format, pitch))

frombuffer interprets the default decoder settings differently from
fromstring; this is being fixed long-term, but as mentioned in the
documentation, you can do it portably by spelling out the decoder
arguments:

im = Image.frombuffer(mode, size, data, "raw", mode, 0, 1)

(1.1.7 will also warn you if you call it without the last four arguments).

</F>
_______________________________________________
Image-SIG maillist - Image-SIG@...
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Re: Example Code for Displaying Pictures--I'm Stumped

2009-11-25T18:05:24Z

Another good option is pyglet. I use it for converting video to streams
of PIL images.

Here's the code for turning a pyglet image into a PIL image:

def pyglet_to_pil_image (pyglet_image):
image = pyglet_image.get_image_data()
format = image.format
if format != 'RGB':
# Only save in RGB or RGBA formats.
format = 'RGBA'
pitch = -(image.width * len(format))

# Note: Don't try and use frombuffer(..); different versions of
# PIL will orient the image differently.
pil_image = Image.fromstring(
format, (image.width, image.height), image.get_data(format, pitch))
# need to flip the image to accommodate Pyglet's transform space
pil_image = pil_image.transpose(Image.FLIP_TOP_BOTTOM)
return pil_image

This code is part of extensions/video.py, part of the UpLib source code
at http://uplib.parc.com/.

Bill
_______________________________________________
Image-SIG maillist - Image-SIG@...
http://mail.python.org/mailman/listinfo/image-sig

Re: Example Code for Displaying Pictures--I'm Stumped

2009-11-25T13:57:04Z

Wayne Watson wrote:
> I didn't know I could post, attach I guess, here. I'll do that later.

as long as it's a small file -- it can be much easier to help

> There is one puzzling format difficulty I have with the file that
> requires some attention. I hope to have that cleared up in the next hour
> or two. Actually, there's a twist in the format that should be
> mentioned. The first image (frame) is 640x480, and I'm pretty sure one
> byte per pixel. However, every other image (frame) after that is 128
> pixels square. An auxiliary text file provides where, x and y pixel
> position, the small image should be pasted to form a complete image with
> the 640x480 frame.

Maybe it's because I"m more familiar with numpy than PIL, but this is
how I'd do that (untested, of course...):

import numpy as np

infile = file('filename')

img = np.fromfile(infile, count=640*480, dtype=np.uint8)

for i in range(num_images):
do_something
small_image = np.fromfile(infile, count=128*128, dtype=np.uint8)
img[x:x+128, y:y+128] = small_image
....

NOTE: np.histogram2d might do what you want for the histogram

I'm sure you can do somethign similar directly with PIL.

-Chris

--
Christopher Barker, Ph.D.
Oceanographer

Emergency Response Division
NOAA/NOS/OR&R (206) 526-6959 voice
7600 Sand Point Way NE (206) 526-6329 fax
Seattle, WA 98115 (206) 526-6317 main reception

Chris.Barker@...
_______________________________________________
Image-SIG maillist - Image-SIG@...
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Re: Example Code for Displaying Pictures--I'm Stumped

2009-11-25T11:52:51Z

I didn't know I could post, attach I guess, here. I'll do that later.

There is one puzzling format difficulty I have with the file that
requires some attention. I hope to have that cleared up in the next hour
or two. Actually, there's a twist in the format that should be
mentioned. The first image (frame) is 640x480, and I'm pretty sure one
byte per pixel. However, every other image (frame) after that is 128
pixels square. An auxiliary text file provides where, x and y pixel
position, the small image should be pasted to form a complete image with
the 640x480 frame. However, if one can get as far as simply displaying
the first frame and then the following smaller frames, I think that
would be quite sufficient for starters.

Yes, I've made some "touchdowns" before on the link you provided earlier
this year. I do need to fiddle with PIL again to get some semblance of
an idea how to use.

Christopher Barker wrote:

> Wayne Watson wrote:
>> David, I have many video files, but only want to process them one at
>> a time. The format is unique, but simple. Basically, 640x480 b/w bmp
>> images one right after the other.
>
> In here:
>
> http://www.pythonware.com/library/pil/handbook/introduction.htm
>
> Under "image sequences" there is enough info to tell you want to do if
> PIL understands your format.
>
>
> What happens when you point PIL at the file? Does it find the first
> image? does it find more than one? If not, then you may need to break
> them apart yourself before feeding them to PIL.
>
>
> Also if it's as simple as a binary dump of a standard data type, then
> you could probably use numpy's "fromfile" to read the data in, you
> could then covert to a PIL image for the histogram, or just use
> numpy's histogram functions to compute it.
>
> You may want to post a (small) sample file here, and others can take a
> look if you're still confused.
>
> -Chris
>
>
>
>
>

Re: Example Code for Displaying Pictures--I'm Stumped

2009-11-25T09:19:12Z

Wayne Watson wrote:
> David, I have many video files, but only want to process them one at a
> time. The format is unique, but simple. Basically, 640x480 b/w bmp
> images one right after the other.

In here:

http://www.pythonware.com/library/pil/handbook/introduction.htm

Under "image sequences" there is enough info to tell you want to do if
PIL understands your format.

What happens when you point PIL at the file? Does it find the first
image? does it find more than one? If not, then you may need to break
them apart yourself before feeding them to PIL.

Also if it's as simple as a binary dump of a standard data type, then
you could probably use numpy's "fromfile" to read the data in, you could
then covert to a PIL image for the histogram, or just use numpy's
histogram functions to compute it.

You may want to post a (small) sample file here, and others can take a
look if you're still confused.

-Chris

--
Christopher Barker, Ph.D.
Oceanographer

Emergency Response Division
NOAA/NOS/OR&R (206) 526-6959 voice
7600 Sand Point Way NE (206) 526-6329 fax
Seattle, WA 98115 (206) 526-6317 main reception

Chris.Barker@...
_______________________________________________
Image-SIG maillist - Image-SIG@...
http://mail.python.org/mailman/listinfo/image-sig

Re: Example Code for Displaying Pictures--I'm Stumped

2009-11-25T08:21:50Z

David, I have many video files, but only want to process them one at a
time. The format is unique, but simple. Basically, 640x480 b/w bmp
images one right after the other. The program should read one image,
then allow the user to produce a histogram of the image displayed. Now
he moves to the next one of interest, and does the same. I started down
this path some months ago, but got side tracked. I did make some
progress, so I think I'll review that, and just see if I can finish it
off. I would think it really isn't a complicated program. In fact, I
would think such a common need, without the histograms, that it should
be available as a possible example of how to read simple video files.
I'll stick to Win Python. I've used C and Linux before, but don't see a
need to go back to it here.

David Kirtley wrote:

> Well, I really had intended it to be a guide and unless you have the
> gnuplot python stuff also, it would not run directly.
>
> What exactly are you trying to do? From what I understood, you have a
> bunch of image files and want to do histograms for each of them.
> (Unless you are trying to do them from video which is problematic. I
> personally saved the video I was working as a set of individual image
> files. Getting them from a video stream is a lot harder and has many
> difficulties- many man-made because of licensing and patents on video
> compression. I have not done it directly and would not want to mess
> with it. It is really nasty.)
>
> Also, that code is pretty old (I think 2.2 or maybe even older Python)
> the new glob stuff
> files = glob.glob(os.path.join('','*.out'))
> will make it easy to get a list of the files in the directory.
>
> So the basic strategy would be :
>
> Get the list of files to process with the glob -- Who chooses these names? ;)
>
> (Not perfect code, just rough idea.....)
>
> for file in file_list:
> image = Image.open(file)
> histogram = Image.chops.histogram -- don't remember where the
> histogram stuff is off the top of my head
> make the comparison
> save the results
>
>
>
> If you are going to be doing some in depth analysis of the data, you
> prob will want to use Numpy and deal with them as arrays.
>
> On Wed, Nov 25, 2009 at 9:44 AM, Wayne Watson
> <sierra_mtnview@...> wrote:
>
>> I thought I'd try executing your code under Win Python, but it objected to
>> indentation, tabs. I tried substituting 4 blanks for them, but that didn't
>> work out. Suggestions?
>>
>> David Kirtley wrote:
>>
>>> http://www.cs.panam.edu/~dkirtley/video/
>>>
>>> Should not need too much modification for what you want to do.
>>>
>>> David Kirtley
>>>
>>> On Tue, Nov 24, 2009 at 7:59 PM, Wayne Watson
>>> <sierra_mtnview@...> wrote:
>>>
>>>
>>>> A few hours ago someone posted some sample Python code somewhere in
>>>> several
>>>> of the python lists pictures. I looked at it and thought that looks
>>>> pretty
>>>> interesting. Now I can't find it. Does anyone know of that post? Typical
>>>> I
>>>> use Image-SIG, Pmw-Toolkit Python Tutor, Tkinter, VisPython lists but I
>>>> don't see it.
>>>>
>>>> My interest is that I would like to step through a video file of b/w
>>>> images,
>>>> 640x480, and stop along the way to make histograms to determine noise
>>>> characteristics of the camera that took the video.
>>>>
>>>> --
>>>> Wayne Watson (Watson Adventures, Prop., Nevada City, CA)
>>>>
>>>> (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
>>>> Obz Site: 39° 15' 7" N, 121° 2' 32" W, 2700 feet
>>>> 350 350 350 350 350 350 350 350 350 350
>>>> Make the number famous. See 350.org
>>>> The major event has passed, but keep the number alive.
>>>>
>>>> Web Page: <www.speckledwithstars.net/>
>>>>
>>>> _______________________________________________
>>>> Image-SIG maillist - Image-SIG@...
>>>> http://mail.python.org/mailman/listinfo/image-sig
>>>>
>>>>
>>>>
>>>
>> --
>> Wayne Watson (Watson Adventures, Prop., Nevada City, CA)
>>
>> (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
>> Obz Site: 39° 15' 7" N, 121° 2' 32" W, 2700 feet
>> 350 350 350 350 350 350 350 350 350 350
>> Make the number famous. See 350.org
>> The major event has passed, but keep the number alive.
>>
>> Web Page: <www.speckledwithstars.net/>
>>
>> _______________________________________________
>> Image-SIG maillist - Image-SIG@...
>> http://mail.python.org/mailman/listinfo/image-sig
>>
>>
>
>

Re: Example Code for Displaying Pictures--I'm Stumped

2009-11-25T07:44:48Z

I thought I'd try executing your code under Win Python, but it objected
to indentation, tabs. I tried substituting 4 blanks for them, but that
didn't work out. Suggestions?

David Kirtley wrote:

> http://www.cs.panam.edu/~dkirtley/video/
>
> Should not need too much modification for what you want to do.
>
> David Kirtley
>
> On Tue, Nov 24, 2009 at 7:59 PM, Wayne Watson
> <sierra_mtnview@...> wrote:
>
>> A few hours ago someone posted some sample Python code somewhere in several
>> of the python lists pictures. I looked at it and thought that looks pretty
>> interesting. Now I can't find it. Does anyone know of that post? Typical I
>> use Image-SIG, Pmw-Toolkit Python Tutor, Tkinter, VisPython lists but I
>> don't see it.
>>
>> My interest is that I would like to step through a video file of b/w images,
>> 640x480, and stop along the way to make histograms to determine noise
>> characteristics of the camera that took the video.
>>
>> --
>> Wayne Watson (Watson Adventures, Prop., Nevada City, CA)
>>
>> (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
>> Obz Site: 39° 15' 7" N, 121° 2' 32" W, 2700 feet
>> 350 350 350 350 350 350 350 350 350 350
>> Make the number famous. See 350.org
>> The major event has passed, but keep the number alive.
>>
>> Web Page: <www.speckledwithstars.net/>
>>
>> _______________________________________________
>> Image-SIG maillist - Image-SIG@...
>> http://mail.python.org/mailman/listinfo/image-sig
>>
>>
>
>