JPEG images from Dwights sample code
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Re: JPEG images from Dwights sample code
by Dwight Kelly
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Richard Nolde wrote:
> Dwight, > When I build the test file generator and run it with the CVS head > version of libtiff from a couple of weeks ago on Fedora 11, I get > alternating stripes of black and white bands on all the images. > However, the order of the bands is Black White Black White for all BUT > the Jpeg compressed images, and in those two the order is White Black > White Black when viewed with GraphicsMagic-1.3.6 2009-07-25-Q16. > > However, Gthumb (Gnome Image Viewer), Gimp 2.6, and Geggie display all > the non-RGB images Black White Black White and all the RGB images > White Black White Black. Which is correct? Hello, monochrome and grayscale will be opposite than RGB. -- Dwight Kelly Apago, Inc. 4080 McGinnis Ferry Rd Suite 601 Alpharetta, GA 30005 voice:(770) 619-1884 fax:(770) 619-1885 email: dkelly@... web: http://www.apago.com _______________________________________________ Tiff mailing list: Tiff@... http://lists.maptools.org/mailman/listinfo/tiff http://www.remotesensing.org/libtiff/ |
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Re: JPEG images from Dwights sample code
by Kevin Myers-2
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Brings up an interesting point regarding test images: All test images
should probably be accompanied by a text description that provides some details regarding what the image is *supposed* to look like. Otherwise, it may not be apparent to someone testing their application whether the image is being displayed correctly or not. I don't know whether such descriptions have been typically supplied or not... ----- Original Message ----- From: "Dwight Kelly" <dkelly@...> To: "Richard Nolde" <richard.nolde@...> Cc: <tiff@...> Sent: Tuesday, September 15, 2009 17:19 Subject: Re: [Tiff] JPEG images from Dwights sample code > Richard Nolde wrote: >> Dwight, >> When I build the test file generator and run it with the CVS head >> version of libtiff from a couple of weeks ago on Fedora 11, I get >> alternating stripes of black and white bands on all the images. >> However, the order of the bands is Black White Black White for all BUT >> the Jpeg compressed images, and in those two the order is White Black >> White Black when viewed with GraphicsMagic-1.3.6 2009-07-25-Q16. >> >> However, Gthumb (Gnome Image Viewer), Gimp 2.6, and Geggie display all >> the non-RGB images Black White Black White and all the RGB images >> White Black White Black. Which is correct? > > Hello, monochrome and grayscale will be opposite than RGB. > > -- > Dwight Kelly > Apago, Inc. 4080 McGinnis Ferry Rd Suite 601 Alpharetta, GA 30005 > voice:(770) 619-1884 fax:(770) 619-1885 > email: dkelly@... web: http://www.apago.com > > _______________________________________________ > Tiff mailing list: Tiff@... > http://lists.maptools.org/mailman/listinfo/tiff > http://www.remotesensing.org/libtiff/ _______________________________________________ Tiff mailing list: Tiff@... http://lists.maptools.org/mailman/listinfo/tiff http://www.remotesensing.org/libtiff/ |
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Re: JPEG images from Dwights sample code
by Toby Thain-2
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On 15-Sep-09, at 6:48 PM, Kevin Myers wrote: > Brings up an interesting point regarding test images: All test images > should probably be accompanied by a text description that provides > some > details regarding what the image is *supposed* to look like. > Otherwise, it > may not be apparent to someone testing their application whether > the image > is being displayed correctly or not. I don't know whether such > descriptions > have been typically supplied or not... Or a copy in a relatively predictable file format, like PNG. :) --T > > ----- Original Message ----- > From: "Dwight Kelly" <dkelly@...> > To: "Richard Nolde" <richard.nolde@...> > Cc: <tiff@...> > Sent: Tuesday, September 15, 2009 17:19 > Subject: Re: [Tiff] JPEG images from Dwights sample code > > >> Richard Nolde wrote: >>> Dwight, >>> When I build the test file generator and run it with the CVS head >>> version of libtiff from a couple of weeks ago on Fedora 11, I get >>> alternating stripes of black and white bands on all the images. >>> However, the order of the bands is Black White Black White for >>> all BUT >>> the Jpeg compressed images, and in those two the order is White >>> Black >>> White Black when viewed with GraphicsMagic-1.3.6 2009-07-25-Q16. >>> >>> However, Gthumb (Gnome Image Viewer), Gimp 2.6, and Geggie >>> display all >>> the non-RGB images Black White Black White and all the RGB images >>> White Black White Black. Which is correct? >> >> Hello, monochrome and grayscale will be opposite than RGB. >> >> -- >> Dwight Kelly >> Apago, Inc. 4080 McGinnis Ferry Rd Suite 601 Alpharetta, GA 30005 >> voice:(770) 619-1884 fax:(770) 619-1885 >> email: dkelly@... web: http://www.apago.com >> >> _______________________________________________ >> Tiff mailing list: Tiff@... >> http://lists.maptools.org/mailman/listinfo/tiff >> http://www.remotesensing.org/libtiff/ > > _______________________________________________ > Tiff mailing list: Tiff@... > http://lists.maptools.org/mailman/listinfo/tiff > http://www.remotesensing.org/libtiff/ _______________________________________________ Tiff mailing list: Tiff@... http://lists.maptools.org/mailman/listinfo/tiff http://www.remotesensing.org/libtiff/ |
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Re: JPEG images from Dwights sample code
by Chris Cox
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If anything, I’d accompany the test files with a small JPEG marked as a preview of what the image should look like (downsample larger images, convert to 8 bit RGB, etc.). Add a readme explaining that these are thumbnails, not exact representations. Chris On 9/15/09 4:31 PM, "Toby Thain" <toby@...> wrote:
_______________________________________________ Tiff mailing list: Tiff@... http://lists.maptools.org/mailman/listinfo/tiff http://www.remotesensing.org/libtiff/ |
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