Nabble - GIMP

Re: creating a texture

2009-11-24T17:20:54Z

>>
>>> hello there i am a blender user
>>> i i wanted to create a texture for bumomap/normal map
>>> in gimp
>>> i tryed the noise filter but this is not what i need
>>>
>>> i am modeling a camera
>>> see camera real image here
>>> http://www.kenrockwell.com/nikon/d40/images/d40-18-55mm-top-big.jpg
>>> u can see that the camera material have little bumps
>>> with different shapes in each little bump
>>> how can i generate a texture like this in gimp
>>>
>>> black and white will be also greate
>>
>>
>>
>>I would try
>>
>>Convert image to grayscale
>>
>>Copy out a small section and save as a .pat file
>>
>>
> i dont understand how grayscale can help
> thank u

Well that was my interpretation of your "black and white will be also
greate"

--

Owen

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From forum: Gimp User

Re: Script-Fu Exceptions and errors

2009-11-24T17:15:57Z

Update 2:
1) Exceptions
The macro (not sure of the underlying primitives) "catch" will catch
errors. The web page didn't even call them exceptions, which explains
why I/google didn't find it quickly.

Ex: when converting an image that might already be RGB to RGB:
(catch (gimp-image-convert-rgb image))

2) The layer issue
As stated before, an earlier command was obliterating my layer and I
forgot to take the head of the get-active-{layer,drawable} in my later
operations.

3) Assertation failures and segfaults

The assertation failures are probably somehow connected with my layer
merging - not that it is good to be able to hit this so easily. I
also found a segfault, do to out of range arguments, since my previous
post and see that this doesn't crash the program - so its running in a
different thread or processs I guess. Not sure if I can catch this
with "catch", if I can't then I'll have to fix these corner cases.
Perhaps I'll make some patches for the function documentation if
people are interested.

Thomas

On Tue, Nov 24, 2009 at 11:34 AM, Thomas DuBuisson
<thomas.dubuisson@...> wrote:

> Update:
>
> 1) The question regarding exceptions remains - there are too many
> corner cases, mostly undocumented, so it would be nice to ignore them
> silently.
>
> 2) I see my fix was almost right but I forgot to take the head of the list:
> "(car (gimp-image-get-active-drawable image))" is what I want, not the
> no-longer-existing layer0 or the whole list returned by
> gimp-image-get-active-{layer,drawable}.
>
> 3) I still get things like the message below, so same question.
> (gimp-console:2987): Gimp-Core-CRITICAL **: gimp_image_remove_layer:
> assertion `gimp_container_have (image->layers, GIMP_OBJECT (layer))'
> failed
>
>
>
> On Tue, Nov 24, 2009 at 10:05 AM, Thomas DuBuisson
> <thomas.dubuisson@...> wrote:
>> Hello list,
>>
>> I am planning on evolving image transformations using an AST of the
>> script-fu langauge and generating random (but syntatically correct)
>> scripts. I would like to avoid programming in hundreds of corner
>> cases into the system and thus have the following questions:
>>
>> 1) Script-fu throws exceptions
>>
>> If/when I do something basic like call "gimp-image-raise-layer" on a
>> layer that can not be raised, an exception is thrown. I would very
>> much like to catch/ignore exceptions such as this but it seems
>> script-fu is too primitive. Am I missing something?
>>
>> 2) gimp-layer-new-from-drawable nearly always fails
>>
>> ------------- CODE --------------
>> (let* ((image (car (gimp-file-load RUN-NONINTERACTIVE "image.png" "image.png")))
>> (layer0 (car (gimp-image-get-active-layer image))))
>> (let* ((layer1 (car (gimp-image-flatten image))))
>> (gimp-layer-set-mode layer1 25)
>> ) (let* ((layer1 (car (gimp-layer-new-from-drawable layer0 image))))
>> ...
>> ----------------- END CODE --------------
>>
>> In the above you see I define layer0 as the active layer (which I
>> thought was a drawable) but this doesn't work for
>> gimp-layer-new-from-drawable. Replacing layer0 with 'image' also
>> doesn't work and most frustratingly, using "
>> (gimp-image-get-active-drawable image)" also doesn't work - which I
>> really thought it should based on the documentation. What does this
>> function expect?
>>
>> (I understand gimp-image-flatten somehow screws everything up by
>> eliminating the layer, but am still not clear how to once-again get a
>> valid layer from my image)
>>
>>
>> 3) C Assertation failures
>> Perhaps most concerning are the assertation failures. Presumably,
>> these are not supposed to happen. How concerned should I be?
>>
>> -------------------- START CONSOLE DUMP -------------------------
>>> (let* ((image (car (gimp-file-load RUN-NONINTERACTIVE "image.png" "image.png")))
>> (layer0 (car (gimp-image-get-active-layer image))))
>> (let* ((layer1 (car (gimp-layer-new-from-drawable layer0 image))))
>> (gimp-layer-add-alpha layer1)
>> (gimp-image-merge-down image layer1 2))
>> (set! layer0 (gimp-image-get-active-layer image))
>> (let* ((layer1 (car (gimp-image-flatten image))))
>> (gimp-layer-set-opacity layer1 21.811554)
>> (gimp-image-merge-down image layer1 0))
>> (set! layer0 (gimp-image-get-active-layer image))
>> (let* ((layer1 (car (gimp-layer-new-from-drawable layer0 image))))
>> (gimp-layer-flatten layer1)
>> (gimp-image-merge-down image layer1 0))
>> (set! layer0 (gimp-image-get-active-layer image))
>> (let* ((currDraw (car (gimp-image-get-active-layer image))))
>> (gimp-file-save RUN-NONINTERACTIVE image currDraw "newImage.png"
>> "newImage.png" ))
>> )
>>
>> (gimp-console:2987): Gimp-Core-CRITICAL **: gimp_image_remove_layer:
>> assertion `gimp_container_have (image->layers, GIMP_OBJECT (layer))'
>> failed
>>
>> ---------------------------- END CONSOLE DUMP -------------------------
>>
>>
>> Cheers,
>> Thomas
>>
>

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From forum: Gimp User

convert an image into an outline

2009-11-24T14:41:30Z

You could select by color and choose the black, then from the select menu
choose "to path" from there go to the edit menu and select "stroke path".

--
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From forum: Gimp User

Re: minimize the main toolbox?

2009-11-24T13:53:42Z

Hi,

there are a lot of useful hints in the "Tips of the Day" dialog, hidden
in the Help menu. Perhaps you guys want to enable the "Tips of the Day"
feature and learn some more nice things about GIMP. One of the tips
would have been this one:

If your screen is too cluttered, you can press Tab in an image
window to toggle the visibility of the toolbox and other dialogs.

Sven

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From forum: Gimp User

Re: creating a texture

2009-11-24T13:50:35Z

Hi,
forums@... (2009-11-24 at 2113.32 +0100):
> hello there i am a blender user
> i i wanted to create a texture for bumomap/normal map
> in gimp
> i tryed the noise filter but this is not what i need

You have to combine it with other things. ;]

> i am modeling a camera
> see camera real image here
> http://www.kenrockwell.com/nikon/d40/images/d40-18-55mm-top-big.jpg
> u can see that the camera material have little bumps
> with different shapes in each little bump
> how can i generate a texture like this in gimp

You can probably do it in Blender too, using clouds texture, custom
colour gradients, etc. But in Gimp:

- new white image.

- rgb noise filter, move sliders to max so you get lots of dots.

- desaturate (lightness one is fine, try others if you want).

- blur (normal one will do here).

- curves, make a _/ curve , the histogram should show a sharp spike on
the right side like /\, I placed the curve parallel to the left side
of spike (x 162, y 0 and x 183, y 255, approx). This leaves you with
some random black spots.

- guassian blur, 1-2 pixels to smooth.

- invert if you need the bump map that way.

As last note, I decided the dot density was too low, so before invert
I duplicated the layer, offset it, and put it in multiply mode. Next
would be making the result tileable (plenty of tutorials about this,
most just forget that you should use offset multiple times different
values, otherwise you will have zones that are hard to touch up).

GSR

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From forum: Gimp User

Re: minimize the main toolbox?

2009-11-24T13:41:29Z

Ironically, I think I have accidentally hidden the toolbox trying to
alt-tab as well. If I knew what I did, I would have stumbled onto the
answer to my own question...

On Tue, Nov 24, 2009 at 11:29 AM, Martijn Weisbeek <weisbeek@...> wrote:

> Olivier,
>
>> Use the TAB key, which toggles visibility of the toolbox and other
>> dockable dialogs. And use F11 to fill the screen with the image window.
>> You can even remove the menu bar, scrolling bars, and status bar, and
>> have an image which really fills the screen.
>
> Those are some nifty shortcut keys. That might also explain why
> sometimes I have "lost" my toolbox.
> I guess that this has happened after I used the tab key for some
> action within GIMP.
> Then I might have meant ALT+TAB (to switch windows) instead, but
> forgot to press ALT and my toolbox is gone...
>
> Do you know whether there is a list of these key combinations online somewhere ?
> I would expect these to be in the GIMP's user manual, but I cannot
> seem to find them.
> http://docs.gimp.org/en/key-reference.html is as close as I could find.
> However, it would be nice when there would be one pages with all of
> these useful GIMP commands.
>
> Thanks in advance,
>
> Martijn
> http://gimp.startpagina.nl
> _______________________________________________
> Gimp-user mailing list
> Gimp-user@...
> https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
>

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From forum: Gimp User

creating a texture

2009-11-24T12:58:41Z

>
>> hello there i am a blender user
>> i i wanted to create a texture for bumomap/normal map
>> in gimp
>> i tryed the noise filter but this is not what i need
>>
>> i am modeling a camera
>> see camera real image here
>> http://www.kenrockwell.com/nikon/d40/images/d40-18-55mm-top-big.jpg
>> u can see that the camera material have little bumps
>> with different shapes in each little bump
>> how can i generate a texture like this in gimp
>>
>> black and white will be also greate
>
>
>
>I would try
>
>Convert image to grayscale
>
>Copy out a small section and save as a .pat file
>
>

i dont understand how grayscale can help
thank u

--
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From forum: Gimp User

Re: creating a texture

2009-11-24T12:41:40Z

> hello there i am a blender user
> i i wanted to create a texture for bumomap/normal map
> in gimp
> i tryed the noise filter but this is not what i need
>
> i am modeling a camera
> see camera real image here
> http://www.kenrockwell.com/nikon/d40/images/d40-18-55mm-top-big.jpg
> u can see that the camera material have little bumps
> with different shapes in each little bump
> how can i generate a texture like this in gimp
>
> black and white will be also greate

I would try

Convert image to grayscale

Copy out a small section and save as a .pat file

--

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From forum: Gimp User

creating a texture

2009-11-24T12:13:32Z

hello there i am a blender user
i i wanted to create a texture for bumomap/normal map
in gimp
i tryed the noise filter but this is not what i need

i am modeling a camera
see camera real image here
http://www.kenrockwell.com/nikon/d40/images/d40-18-55mm-top-big.jpg
u can see that the camera material have little bumps
with different shapes in each little bump
how can i generate a texture like this in gimp

black and white will be also greate

thank you

--
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From forum: Gimp User

Re: Script-Fu Exceptions and errors

2009-11-24T11:34:43Z

Update:

1) The question regarding exceptions remains - there are too many
corner cases, mostly undocumented, so it would be nice to ignore them
silently.

2) I see my fix was almost right but I forgot to take the head of the list:
"(car (gimp-image-get-active-drawable image))" is what I want, not the
no-longer-existing layer0 or the whole list returned by
gimp-image-get-active-{layer,drawable}.

3) I still get things like the message below, so same question.
(gimp-console:2987): Gimp-Core-CRITICAL **: gimp_image_remove_layer:
assertion `gimp_container_have (image->layers, GIMP_OBJECT (layer))'
failed

On Tue, Nov 24, 2009 at 10:05 AM, Thomas DuBuisson
<thomas.dubuisson@...> wrote:

> Hello list,
>
> I am planning on evolving image transformations using an AST of the
> script-fu langauge and generating random (but syntatically correct)
> scripts. I would like to avoid programming in hundreds of corner
> cases into the system and thus have the following questions:
>
> 1) Script-fu throws exceptions
>
> If/when I do something basic like call "gimp-image-raise-layer" on a
> layer that can not be raised, an exception is thrown. I would very
> much like to catch/ignore exceptions such as this but it seems
> script-fu is too primitive. Am I missing something?
>
> 2) gimp-layer-new-from-drawable nearly always fails
>
> ------------- CODE --------------
> (let* ((image (car (gimp-file-load RUN-NONINTERACTIVE "image.png" "image.png")))
> (layer0 (car (gimp-image-get-active-layer image))))
> (let* ((layer1 (car (gimp-image-flatten image))))
> (gimp-layer-set-mode layer1 25)
> ) (let* ((layer1 (car (gimp-layer-new-from-drawable layer0 image))))
> ...
> ----------------- END CODE --------------
>
> In the above you see I define layer0 as the active layer (which I
> thought was a drawable) but this doesn't work for
> gimp-layer-new-from-drawable. Replacing layer0 with 'image' also
> doesn't work and most frustratingly, using "
> (gimp-image-get-active-drawable image)" also doesn't work - which I
> really thought it should based on the documentation. What does this
> function expect?
>
> (I understand gimp-image-flatten somehow screws everything up by
> eliminating the layer, but am still not clear how to once-again get a
> valid layer from my image)
>
>
> 3) C Assertation failures
> Perhaps most concerning are the assertation failures. Presumably,
> these are not supposed to happen. How concerned should I be?
>
> -------------------- START CONSOLE DUMP -------------------------
>> (let* ((image (car (gimp-file-load RUN-NONINTERACTIVE "image.png" "image.png")))
> (layer0 (car (gimp-image-get-active-layer image))))
> (let* ((layer1 (car (gimp-layer-new-from-drawable layer0 image))))
> (gimp-layer-add-alpha layer1)
> (gimp-image-merge-down image layer1 2))
> (set! layer0 (gimp-image-get-active-layer image))
> (let* ((layer1 (car (gimp-image-flatten image))))
> (gimp-layer-set-opacity layer1 21.811554)
> (gimp-image-merge-down image layer1 0))
> (set! layer0 (gimp-image-get-active-layer image))
> (let* ((layer1 (car (gimp-layer-new-from-drawable layer0 image))))
> (gimp-layer-flatten layer1)
> (gimp-image-merge-down image layer1 0))
> (set! layer0 (gimp-image-get-active-layer image))
> (let* ((currDraw (car (gimp-image-get-active-layer image))))
> (gimp-file-save RUN-NONINTERACTIVE image currDraw "newImage.png"
> "newImage.png" ))
> )
>
> (gimp-console:2987): Gimp-Core-CRITICAL **: gimp_image_remove_layer:
> assertion `gimp_container_have (image->layers, GIMP_OBJECT (layer))'
> failed
>
> ---------------------------- END CONSOLE DUMP -------------------------
>
>
> Cheers,
> Thomas
>

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From forum: Gimp User

convert an image into an outline

2009-11-24T10:34:35Z

I have an image roughly 600 px square which in which the picture was
taken on a white-ish background. I managed to crop it well enough to
now have a silhouette of the object, black object on white background.
Is there a way to convert it to an outline, say with a 1-3 pixel
border? It is currently a .png.

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From forum: Gimp User

Script-Fu Exceptions and errors

2009-11-24T10:05:27Z

Hello list,

I am planning on evolving image transformations using an AST of the
script-fu langauge and generating random (but syntatically correct)
scripts. I would like to avoid programming in hundreds of corner
cases into the system and thus have the following questions:

1) Script-fu throws exceptions

If/when I do something basic like call "gimp-image-raise-layer" on a
layer that can not be raised, an exception is thrown. I would very
much like to catch/ignore exceptions such as this but it seems
script-fu is too primitive. Am I missing something?

2) gimp-layer-new-from-drawable nearly always fails

------------- CODE --------------
(let* ((image (car (gimp-file-load RUN-NONINTERACTIVE "image.png" "image.png")))
(layer0 (car (gimp-image-get-active-layer image))))
(let* ((layer1 (car (gimp-image-flatten image))))
(gimp-layer-set-mode layer1 25)
) (let* ((layer1 (car (gimp-layer-new-from-drawable layer0 image))))
...
----------------- END CODE --------------

In the above you see I define layer0 as the active layer (which I
thought was a drawable) but this doesn't work for
gimp-layer-new-from-drawable. Replacing layer0 with 'image' also
doesn't work and most frustratingly, using "
(gimp-image-get-active-drawable image)" also doesn't work - which I
really thought it should based on the documentation. What does this
function expect?

(I understand gimp-image-flatten somehow screws everything up by
eliminating the layer, but am still not clear how to once-again get a
valid layer from my image)

3) C Assertation failures
Perhaps most concerning are the assertation failures. Presumably,
these are not supposed to happen. How concerned should I be?

-------------------- START CONSOLE DUMP -------------------------
> (let* ((image (car (gimp-file-load RUN-NONINTERACTIVE "image.png" "image.png")))
(layer0 (car (gimp-image-get-active-layer image))))
(let* ((layer1 (car (gimp-layer-new-from-drawable layer0 image))))
(gimp-layer-add-alpha layer1)
(gimp-image-merge-down image layer1 2))
(set! layer0 (gimp-image-get-active-layer image))
(let* ((layer1 (car (gimp-image-flatten image))))
(gimp-layer-set-opacity layer1 21.811554)
(gimp-image-merge-down image layer1 0))
(set! layer0 (gimp-image-get-active-layer image))
(let* ((layer1 (car (gimp-layer-new-from-drawable layer0 image))))
(gimp-layer-flatten layer1)
(gimp-image-merge-down image layer1 0))
(set! layer0 (gimp-image-get-active-layer image))
(let* ((currDraw (car (gimp-image-get-active-layer image))))
(gimp-file-save RUN-NONINTERACTIVE image currDraw "newImage.png"
"newImage.png" ))
)

(gimp-console:2987): Gimp-Core-CRITICAL **: gimp_image_remove_layer:
assertion `gimp_container_have (image->layers, GIMP_OBJECT (layer))'
failed

---------------------------- END CONSOLE DUMP -------------------------

Cheers,
Thomas
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From forum: Gimp User

Re: minimize the main toolbox?

2009-11-24T09:29:08Z

Olivier,

> Use the TAB key, which toggles visibility of the toolbox and other
> dockable dialogs. And use F11 to fill the screen with the image window.
> You can even remove the menu bar, scrolling bars, and status bar, and
> have an image which really fills the screen.

Those are some nifty shortcut keys. That might also explain why
sometimes I have "lost" my toolbox.
I guess that this has happened after I used the tab key for some
action within GIMP.
Then I might have meant ALT+TAB (to switch windows) instead, but
forgot to press ALT and my toolbox is gone...

Do you know whether there is a list of these key combinations online somewhere ?
I would expect these to be in the GIMP's user manual, but I cannot
seem to find them.
http://docs.gimp.org/en/key-reference.html is as close as I could find.
However, it would be nice when there would be one pages with all of
these useful GIMP commands.

Thanks in advance,

Martijn
http://gimp.startpagina.nl
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From forum: Gimp User

Re: minimize the main toolbox?

2009-11-24T08:33:29Z

Thanks. I got several responses - but they are sent to me and not the
list. I never knew the <tab> key toggled the visibility of the
toolbox.

Thanks!

Ryan

On Tue, Nov 24, 2009 at 10:31 AM, Olivier Lecarme
<ol@...> wrote:

> Use the TAB key, which toggles visibility of the toolbox and other
> dockable dialogs. And use F11 to fill the screen with the image window.
> You can even remove the menu bar, scrolling bars, and status bar, and
> have an image which really fills the screen.
>
> --
>
>
> Olivier Lecarme
>

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From forum: Gimp User

Re: minimize the main toolbox?

2009-11-24T08:31:56Z

Use the TAB key, which toggles visibility of the toolbox and other
dockable dialogs. And use F11 to fill the screen with the image window.
You can even remove the menu bar, scrolling bars, and status bar, and
have an image which really fills the screen.

--

Olivier Lecarme
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From forum: Gimp User

Latest version issue...

2009-11-24T07:03:49Z

This is more of a technical question. I hope I’m not off topic. Apologies in advance if I am…

I have several windows XP machines running Gimp 2.6 successfully. We use a custom script to make specific sizes for our web site. The script runs fine with an exception on one machine.

The machine is still running Gimp 2.2. The scripts run fine under 2.2. When I remove 2.2 and install 2.6 the Gimp runs fine but the script (running fine on other 2.6 machines) fails with an error.

I’m wondering if there’s an old dll or something that’s confusing things since the script runs fine on every other machine. Any suggestions for a solution besides simply staying on 2.2?

Stuart Rauh
Director of Internet Operations
Stuart.Rauh@...
Phone: (515) 242-3537

1801 Grand Ave.
Des Moines, IA 50309
www.whotv.com

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From forum: Gimp User

minimize the main toolbox?

2009-11-24T05:42:57Z

Is it possible to either minimize the toolbox or have an image window
in front of the toolbox. I am using the GIMP as a digital whiteboard
with a digitizing tablet (Wacom Bamboo) for my lectures. I would like
to write on an image that fills as much of the screen as possible and
would like the toolbox to be either behind the current image or
minimized. It is not obvious to me how to make it not be on top.

Thanks,

Ryan
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From forum: Gimp User

Re: DAG in GEGL and its role in GIMP

2009-11-24T04:33:53Z

Tim Chen wrote:
> I am particularly interested in the topology of the graph generated by
> GIMP for I am considering the possibility of implementing a plug-in that
> can allow user to directly manipulate the DAG itself. I can already
> foresee some interesting use case such as non-linear undo/redo,
> operation reuse...etc
[..]
> And of course, all comments and brainstorm are welcome :D

hi, i can only apply for the brainstorming section, sorry :)

have you considered to start with a stand-alone GEGL DAG editor?
(as opposed to editing the GIMP DAG). That would already be a very
useful tool and additionally a nice testbed for advanced functionality.

Reason is, i see quite some difficult bits for a GIMP DAG editor,
for the UI has been decided to utilize operation chains instead of trees.
So the UI will deliberately allow only a subset of DAG editing.
In consequence, it will be difficult to resolve conflicts between edits done
via the DAG editor and edits done via the standard UI. And this 'standard UI'
is yet to be designed as is a DAG plugin API...

Older versions of GEGL featured a rudimentary DAG editor, but i can't
access the web site right now - i guess prior to 0.0.18 or so.

An interesting option to migrate such a GEGL editor into GIMP is to make it
a standard plugin which hosts its private GEGL tree -- embedded into the
GIMP tree..

regards,
yahvuu
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From forum: Gimp Developer

Re: Hi there

2009-11-23T23:08:55Z

> Hi there:
>
> I've been using The Gimp from some time now, but always as quick image
> editor. Now I want to use to more things.
> I'm by no means a pro, just a programmer, a linux user and an
> enthusiast on image editing.
> I'd like to learn about how using Gimp. Before posting something on
> the list I wish to know if there any kind of rule, besides the google
> first rule ;).
> Hope learn and help to learn.

This manual is probably your best bet, http://docs.gimp.org/2.6/en/

Pretty old, http://gimp-savvy.com/BOOK/index.html but good on theory

I haven't read this, but it's up to date and worth buying
http://gimpbook.com/

Otherwise, as you say, Google for various tutorials, there are a
zillion of them. http://www.gimpusers.com is a good place to bookmark

Ask questions on irc.freenode.org #gimp
--

Owen

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From forum: Gimp User

Hi there

2009-11-23T22:08:57Z

Hi there:

I've been using The Gimp from some time now, but always as quick image editor. Now I want to use to more things.
I'm by no means a pro, just a programmer, a linux user and an enthusiast on image editing.
I'd like to learn about how using Gimp. Before posting something on the list I wish to know if there any kind of rule, besides the google first rule ;).
Hope learn and help to learn.

masterLoki
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From forum: Gimp User

Re: DAG in GEGL and its role in GIMP

2009-11-23T19:24:48Z

I am particularly interested in the topology of the graph generated by GIMP for I am considering the possibility of implementing a plug-in that can allow user to directly manipulate the DAG itself. I can already foresee some interesting use case such as non-linear undo/redo, operation reuse...etc

However, to make it feasible, a DAG visualization with readable and reasonable topology has to be built on the fly during the image editing process. At least, DAG should clearly show the dependency between nodes with overlapped region and remove or hide unnecessary edges.

I am wondering is there any related projects or on-going effort for building such DAG editor?

And of course, all comments and brainstorm are welcome :D

Thanks,
Tim Chen

On Tue, Nov 24, 2009 at 8:08 AM, Øyvind Kolås <islewind@...> wrote:

On Mon, Nov 23, 2009 at 3:46 AM, Tim Chen <timchen@...> wrote:
> Recently, I have spent my time reading source code of both GIMP and GEGL,
> and got few questions about GEGL and its future role in GIMP.
>
> 1. Why DAG in GEGL? Intuitively, say if we have two operations that are
> applied on two independent regions, they should be located in two separated
> sub-tree (sub-graph), so that we can save save some traverse time and
> potential redraw time.

Time spent on graph traversal is neglible compared to pixel computation time.

> However, it seems like that there is no such
> mechanism (correct me if I misunderstand the code) and all operation
> cache/reuse are determined according to the spatial relationship between the
> rectangle associated with the operations. If that's the case, won't a simple
> link-list suffice?

GEGL doesn't evaluate the full image at each evaluation, but only a
smaller region of interest (roi). This allows GEGL to compute the
minimall needed roi of the input nodes to reduce the amount of needed
computation, in addition caches might allow GEGL to skip some of the
pre-computation needed to satisfy the demands made by a single node.

> 2. Following question one, it seems like that GEGL has not been fully
> integrated into GIMP (2.7) yet, and I am wondering that for some common
> image manipulation case, say red-eye removal or skin smooth, what will the
> DAG in GEGL look like? Will it look like a tree with height of two
> (connecting all operations to the root display node) or a simple 1-D list?

One of the goals of GEGL integration in GIMP is to make GIMP be a non
destructive image editor. This means that instead of destructing a
layer (and saving the previous state in undo tiles), the layer will be
augmented with an operation that performs, and perhaps retains a cache
of the result for the operation(s) applied to it.

It is also possible, if I understand the idea you propose correctly to
feed the result of applying an application back to the original
buffer, this is what GIMP already does for its tentative GEGL
integration for the color tools.

> Ideally, how should GIMP build the graph to maximize the rendering
> efficiency?

This is yet to be determined, but ideally GIMP builds the graphs it
needs, and it is GEGLs responsibility to restructure and/or evaluate
them efficiently.

/Øyvind K.
--
«The future is already here. It's just not very evenly distributed»
-- William Gibson
http://pippin.gimp.org/ http://ffii.org/

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From forum: Gimp Developer

Re: Scaling large tiff files

2009-11-23T18:00:17Z

> I work with a proprietary software package that imports image files
> (in this
> case, large tiffs containing hi-res images of architectural plans),
> and large
> plans, especially if you import five or six of them, tend to choke the
> application.
>
> It was suggested that I open these images in Photoshop and save them
> as
> pdf's.
>
> In PS, I can open them, save them as PDF's, task complete.
>
> In GIMP, the same exercise yielded pdf's that were of low resolution,
> and, in
> some cases, I believe, not true to the original scale of the tiff
> images (a
> very important factor to the software in which the ultimate images
> will be
> utilized).
>
> Can someone clue me in as to how I can open these large tiffs in GIMP,
> save
> or export them as pdf's, and preserve the original resolution (or
> viewing
> quality) and the same scale?

Gimp is definitely the wrong tool for for this.

You have one answer, but you might also want to look at Scribus to
import your tiffs and produce pdfs.

Particularly if you wish to add annotations
--

Owen

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From forum: Gimp User

Re: Scaling large tiff files

2009-11-23T16:49:09Z

On Tue, 24 Nov 2009 01:42:45 +0100 (CET)
Carusoswi <forums@...> wrote:

> I work with a proprietary software package that imports image files (in
> this case, large tiffs containing hi-res images of architectural plans),
> and large plans, especially if you import five or six of them, tend to
> choke the application.
>
> It was suggested that I open these images in Photoshop and save them as
> pdf's.
>
> In PS, I can open them, save them as PDF's, task complete.
>
> In GIMP, the same exercise yielded pdf's that were of low resolution,
> and, in some cases, I believe, not true to the original scale of the
> tiff images (a very important factor to the software in which the
> ultimate images will be utilized).
>
> Can someone clue me in as to how I can open these large tiffs in GIMP,
> save or export them as pdf's, and preserve the original resolution (or
> viewing quality) and the same scale?
>

For windows:

http://tiff.software.informer.com/download-tiff-to-dxf-convert-linux/

For Linux:

http://linux.die.net/man/1/tiff2pdf

Much better than relying on GIMP

--
Frank<beacon@...>
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From forum: Gimp User

Scaling large tiff files

2009-11-23T16:42:45Z

I work with a proprietary software package that imports image files (in this
case, large tiffs containing hi-res images of architectural plans), and large
plans, especially if you import five or six of them, tend to choke the
application.

It was suggested that I open these images in Photoshop and save them as
pdf's.

In PS, I can open them, save them as PDF's, task complete.

In GIMP, the same exercise yielded pdf's that were of low resolution, and, in
some cases, I believe, not true to the original scale of the tiff images (a
very important factor to the software in which the ultimate images will be
utilized).

Can someone clue me in as to how I can open these large tiffs in GIMP, save
or export them as pdf's, and preserve the original resolution (or viewing
quality) and the same scale?

Thanks.

Caruso

--
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From forum: Gimp User

Re: DAG in GEGL and its role in GIMP

2009-11-23T16:08:10Z

On Mon, Nov 23, 2009 at 3:46 AM, Tim Chen <timchen@...> wrote:
> Recently, I have spent my time reading source code of both GIMP and GEGL,
> and got few questions about GEGL and its future role in GIMP.
>
> 1. Why DAG in GEGL? Intuitively, say if we have two operations that are
> applied on two independent regions, they should be located in two separated
> sub-tree (sub-graph), so that we can save save some traverse time and
> potential redraw time.

Time spent on graph traversal is neglible compared to pixel computation time.

> However, it seems like that there is no such
> mechanism (correct me if I misunderstand the code) and all operation
> cache/reuse are determined according to the spatial relationship between the
> rectangle associated with the operations. If that's the case, won't a simple
> link-list suffice?

GEGL doesn't evaluate the full image at each evaluation, but only a
smaller region of interest (roi). This allows GEGL to compute the
minimall needed roi of the input nodes to reduce the amount of needed
computation, in addition caches might allow GEGL to skip some of the
pre-computation needed to satisfy the demands made by a single node.

> 2. Following question one, it seems like that GEGL has not been fully
> integrated into GIMP (2.7) yet, and I am wondering that for some common
> image manipulation case, say red-eye removal or skin smooth, what will the
> DAG in GEGL look like? Will it look like a tree with height of two
> (connecting all operations to the root display node) or a simple 1-D list?

One of the goals of GEGL integration in GIMP is to make GIMP be a non
destructive image editor. This means that instead of destructing a
layer (and saving the previous state in undo tiles), the layer will be
augmented with an operation that performs, and perhaps retains a cache
of the result for the operation(s) applied to it.

It is also possible, if I understand the idea you propose correctly to
feed the result of applying an application back to the original
buffer, this is what GIMP already does for its tentative GEGL
integration for the color tools.

> Ideally, how should GIMP build the graph to maximize the rendering
> efficiency?

This is yet to be determined, but ideally GIMP builds the graphs it
needs, and it is GEGLs responsibility to restructure and/or evaluate
them efficiently.

/Øyvind K.
--
«The future is already here. It's just not very evenly distributed»
-- William Gibson
http://pippin.gimp.org/ http://ffii.org/
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From forum: Gimp Developer

Re: trying to learn path tool

2009-11-23T09:18:43Z

Quoting Eain <forums@...>:

> Apologies for such basic questions.
>
> 1) when I have made a path to cut out a selection but before I finish if I
> enlarge the image the anchors and connecting lines all disappear. The undo
> history does not seem to let me step back from this. What is going on?

I did not experience this disappearance of the path when enlarging the
image; however, the path WILL disappear view if you activate a
different tool from the Toolbox. The path will still be there, it is
just hidden.

You can make the path re-appear by double-clicking on its thumbnail
preview in the Paths Dialog (if your Path Dialog is not visible, use
"Windows->Dockable Dialogs->Paths" to raise it). Note also that there
is an "eyeball" associated with the path which you can toggle (similar
to how you change the visibility of layers in the Layers Dialog) to
force the path to always be shown.

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From forum: Gimp User

trying to learn path tool

2009-11-23T07:48:57Z

Apologies for such basic questions.

1) when I have made a path to cut out a selection but before I finish if I
enlarge the image the anchors and connecting lines all disappear. The undo
history does not seem to let me step back from this. What is going on?

2) Is this the correct forum for completely new users? I do not wish to
annoy the community with simplistic questions.

Eain

--
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From forum: Gimp User

GIMP's changed; Not as many filters as it used to have and only .xcf files are allowed.

2009-11-23T07:35:39Z

About a year ago, I downloaded GIMP. It allowed me to save my images as .PNG, .JPEG, and .GIF(not to mention allowed me to open .png and .jpeg images without getting an error message),etc and had a BUNCH of filters. But recently(about a three weeks ago), GIMP wouldn't open at all. So I uninstalled it, went online to http://www.gimp.org/downloads/ and reinstalled GIMP 2.6.7 for Windows. However, it still wouldn't open, it would just keep stopping at one of the scripts/plug-ins while it was loading. I tried everything to get it to open and finally tried putting the "plug-in" folder that came with GIMP 2.6.7 into the "bin" folder and tried opening the program again. It finally opened. But, to my surprise and aggravation, would only save images as .xcf and had only two filters(distorts and generic), when before it had artistic, blur, animation, and many, many more. Please let me know what is happening, and if the GIMP developers changed the version of gimp and if there is anyway i can get the GIMP i used to have, with the ability to save and open .png and .gif, etc., and all the filters it used to have. It would be VERY appreciated. Thank you!

From forum: Gimp Developer

Re: GIMP T-shirts in our online store

2009-11-23T06:16:18Z

On Mon, Nov 23, 2009 at 3:58 PM, Ismael Barros² <razielmine@...> wrote:
> Hi again,
>
> Design submitting deadline is over, and the designs are ready to get voted.
>
> You can vote here: http://www.freewear.org/?contest=gimp

That does not seem to be the case. For whatever reason I cant select
the design I like. I like the rasterized Wilber(last on the page) by
Tobias best, tho the dark version needs a more contrasting color I
think.

--
--Alexia
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From forum: Gimp Developer

Re: GIMP T-shirt design contest

2009-11-23T05:59:25Z

Hi again,

Design submitting deadline is over, and the designs are ready to get voted.

You can vote here: http://www.freewear.org/?contest=gimp

Regards,
Ismael
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From forum: Gimp User

Re: GIMP T-shirts in our online store

2009-11-23T05:58:55Z

Hi again,

Design submitting deadline is over, and the designs are ready to get voted.

You can vote here: http://www.freewear.org/?contest=gimp

Regards,
Ismael
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From forum: Gimp Developer

DAG in GEGL and its role in GIMP

2009-11-22T19:46:56Z

Hi all,

Recently, I have spent my time reading source code of both GIMP and GEGL, and got few questions about GEGL and its future role in GIMP.

1. Why DAG in GEGL? Intuitively, say if we have two operations that are applied on two independent regions, they should be located in two separated sub-tree (sub-graph), so that we can save save some traverse time and potential redraw time. However, it seems like that there is no such mechanism (correct me if I misunderstand the code) and all operation cache/reuse are determined according to the spatial relationship between the rectangle associated with the operations. If that's the case, won't a simple link-list suffice?

2. Following question one, it seems like that GEGL has not been fully integrated into GIMP (2.7) yet, and I am wondering that for some common image manipulation case, say red-eye removal or skin smooth, what will the DAG in GEGL look like? Will it look like a tree with height of two (connecting all operations to the root display node) or a simple 1-D list? Ideally, how should GIMP build the graph to maximize the rendering efficiency?

Thanks for your answering,
Tim Chen

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From forum: Gimp Developer

Re: Airbrush/Brush Banding Effect At Low Pressure/Opacity

2009-11-21T14:09:36Z

On Thu, Nov 19, 2009 at 02:01:13PM +1030, David Gowers wrote:
> On Thu, Nov 19, 2009 at 11:17 AM, James Cox <jaycox@...> wrote:
> > result = floor(input * opacity + g_random_double());
>
> If you pregenerate a lookup table (say 256 entries), keep a counter
> which cycles 0,1,2,....255,0,1,2,....255, and only add a random
> integer to that counter at the start of every dab, you could get that
> going at decent speeds.

I have implemented this in (historical) release 0.5.1 of MyPaint. Using 8
bytes of precalculated noise; brush_dab.c line 120 in case anyone cares.

I got sick of the noise, though. It tends to get visible when you use
brushes that really need this correction. Not worth the effort I think.
The better solution is to calculate in 16bpc, or use different brushes, or
don't use incremental mode (MyPaint supports only incremental). See
http://mypaint.intilinux.com/?p=19 for a sample.
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From forum: Gimp Developer

Re: Brush edit problem

2009-11-20T15:29:50Z

Chris wrote:

No, but it may be impossible to have an even sized 'virtual' brush,
which is the type you're editing.



Ah OK - many thanks for both your suggestions :)

Why not use the 1x1 with scaling set to 2?

Patrick

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From forum: Gimp User

Re: Reduce or crop an image by N pixels?

2009-11-20T15:22:44Z

vr writes:
> Oops, after poking around a bit more I realize now that the actual crop
> tool's selector is more friendly than the selection tool selector for what
> I'm trying to do. I guess the real question I'm asking is how do you get
> the selection tool to operate like the crop tools selector? Meaning, not go
> outside the perimeter of the layer you want to select within?

The closest I've found is View->Snap to Canvas Edges. It's not
perfect -- you still have to be fairly careful and occasionally
it doesn't snap at all -- but it will certainly help you avoid
going over the edges.

In 2.6, you have to set it on each image separately. In 2.8 it will
be possible to make that the default. Though you may not want that;
I find I always want it for Rect Select, but it gets in the way
for the Move tool, so I have to keep toggling the option.

...Akkana
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From forum: Gimp User