Re: [Gimp-developer] Saving black/white TIFF with 'CCITT Group 4' encoding
Hi, On Mon, 2007-02-12 at 20:09 +0100, Manfred Joerg wrote: So far so good. What do you think about my idea to add an option to the threshold tool which allows the user to create an indexed black/white image instead of a rgb image which only contains black and white pixels? I don't like it because none of our tools change the image mode. The conversion to indexed takes a lot of time for big images.. It doesn't take very long if you turn off dithering. Anyway, if there's a performance problem, then we (or you) should look into fixing it instead of adding ways to work around it. Perhaps it would be a good idea to gather some profiling data on the RGB-Indexed conversion code. Sven ___ Gimp-developer mailing list Gimp-developer@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer
Re: [Gimp-developer] Saving black/white TIFF with 'CCITT Group 4' encoding
On Tuesday, February 13, 2007, 9:57:17, Sven Neumann wrote: It doesn't take very long if you turn off dithering. Anyway, if there's a performance problem, then we (or you) should look into fixing it instead of adding ways to work around it. Perhaps it would be a good idea to gather some profiling data on the RGB-Indexed conversion code. Compared to GIMP 1.2.5, converting image to indexed palette is much slower (for pictures that I often convert to indexed, GIMP 1.2.5 usually does the conversion instantly, while GIMP 2.x takes several seconds [and fills the progress bar 3 times while doing it]). I also prefer the result given by GIMP 1.2.5. -- Jernej Simončič http://deepthought.ena.si/ The shortest distance between two points is under construction. -- McGregor's Revised Maxim ___ Gimp-developer mailing list Gimp-developer@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer
Re: [Gimp-developer] Saving black/white TIFF with 'CCITT Group 4' encoding
Hi Sven, On Monday 12 February 2007 08:38, Sven Neumann wrote: 1. It doesn't allow the user to save a rgb image as CCITT Datagroup 3/4 even if it contains only black and white pixels. Instead the user has to convert the image to indexed mode black/white first. That is the intended behavior. The user should only be allowed to select the new compression schemes if the image is indexed with a b/w colormap. The radio buttons should be insensitive otherwise and an allowed compression scheme should be preselected. Sven So far so good. What do you think about my idea to add an option to the threshold tool which allows the user to create an indexed black/white image instead of a rgb image which only contains black and white pixels? The conversion to indexed takes a lot of time for big images.. Manfred ___ Gimp-developer mailing list Gimp-developer@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer
Re: [Gimp-developer] Saving black/white TIFF with 'CCITT Group 4' encoding
Hi, On Sun, 2007-02-11 at 19:44 +0100, Manfred Joerg wrote: I just checked your revised tiff patch. 1. It doesn't allow the user to save a rgb image as CCITT Datagroup 3/4 even if it contains only black and white pixels. Instead the user has to convert the image to indexed mode black/white first. That is the intended behavior. The user should only be allowed to select the new compression schemes if the image is indexed with a b/w colormap. The radio buttons should be insensitive otherwise and an allowed compression scheme should be preselected. As long as images saved that way are also loaded in Indexed mode with a b/w colormap, this should be fine. Sven ___ Gimp-developer mailing list Gimp-developer@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer
Re: [Gimp-developer] Saving black/white TIFF with 'CCITT Group 4' encoding
Hi, On Thu, 2007-01-25 at 16:16 +0100, Manfred Joerg wrote: I think that I fixed bug 162119. My patch allows the user to save TIFF images with CCITT Group 4. The advantage of this file format is that a scanned text page (600 dpi) takes only 100 KByte. The patch is based on version 2.3.14. I only added the option to the dialog and an error message which informs the user that only black / white images can be saved as CCITT Group 4. The tiff library already contains the necessary code. I attached my patch to the bug report. I've attached a revised patch some days ago. Did you (or anyone else) get a chance to try it? I would like to commit this as soon as possible but the patch needs some more testing before it can go in. Sven ___ Gimp-developer mailing list Gimp-developer@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer
[Gimp-developer] Saving black/white TIFF with 'CCITT Group 4' encoding
Hello, I think that I fixed bug 162119. My patch allows the user to save TIFF images with CCITT Group 4. The advantage of this file format is that a scanned text page (600 dpi) takes only 100 KByte. The patch is based on version 2.3.14. I only added the option to the dialog and an error message which informs the user that only black / white images can be saved as CCITT Group 4. The tiff library already contains the necessary code. I attached my patch to the bug report. Regards Manfred ___ Gimp-developer mailing list Gimp-developer@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer
