Scripsit Sven Neumann > If someone would write a PNG save plug-in that actually uses the > full alpha channel information for indexed images,
One cannot do this, in general, because an indexed PNG stores a single alpha value for each palette entry. An image with an unrestricted alpha channel would most likely lead to more color/alpha combinations than the 256 palette slots available in PNG. > But it's more likely that we will soon drop indexed mode completely and > push handling of indexed color to the load and save plug-ins. I can see good software-engineering reasons to want to eliminate indexed representation internally, but from a usability standpoint it will be a loss not to be able to restrict the possible color values to a predetermined palette. Imagine finding out only after several hours of editing that some of the pixels you intended to be (255,192,53) accidentally became (255,192,54), and others became (255,188,53) and a few of the (64,64,0) became (64,64,3), and this is a source of immense confusion to software later your build process, which recognizes exactly those colors to have a special meaning, and now you have to go through a few dozen layers to find all of the misfit pixels and correct their color one layer and color at a time. Indexed editing prevents making the mistake in the first place; if I have not explicitly added (255,192,54) to the palette I know that I'll not risk finding it in the output. -- Henning Makholm "Punctuation, is? fun!" _______________________________________________ Gimp-developer mailing list Gimp-developer@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer
