On Wed, Jan 07, 2004 at 09:43:09PM +0100, Sven Neumann wrote: > Hi, > > David G??mez <david@xxxxxxxxxxxx> writes: > > > I've scanned some jpeg images with a 24bit depth. Some of them are old > > photographies in black&white that show 'bands' when are displayed on > > a 16 bit depth display. After digging in the menus i noticed that the > > image could be transformed to a indexed pallete, with a Floyd-Steinberg > > dithering, but that did not solve nothing, the maximum number of colors > > cannot be set to more that 256 :-/. Is there another way to dither an > > image in gimp? Programs like gqview, an image viewer, use the dither > > algorithms bundled with gdx_pixbuf in gtk2, and they work perfectly with > > the same images. Why cannot the gimp do the same quality dithering if > > it's using the same library? > > The GIMP display canvas uses the dithering routines from GdkRGB which > is probably what you are refering to. Of course this does only affect > the display, not the image data. I am not sure but I think I remember > a plug-in that could apply dithering to RGB images w/o converting to > Indexed colors. Actually, gqview defaults to GDK_RGB_DITHER_NORMAL whereas gimp uses GDK_RGB_DITHER_MAX always, which should theoretically do a better job. Maybe you could put up a sample image somewhere so we can see what exactly the problem is? -Yosh
