Gimp gif color problem8/31/2023 It is a fairly recent format which is well supported by browsers but server software doesn't always the WebP files as image types (including the one we use here, alas). The WebP format can be used for animation, and remove most GIF restrictions (full color, lossy or lossless, partial opacity.). By default it's a 'best fit', so you have no control on the colors, and nothing tells Gimp that the frame should be a very specific color. If you export from RGB, Gimp recomputes a colormap. If you edit a GIF and remain in color-indexed mode the GIF is exported with its initial colormap. So in the end the image may be 24BPP but is constrained to use only 256 colors among the 24M possible.Ĭolor indexing yields grainy/pixellated pictures because there aren't enough colors available to represent smooth color transitions. A GIF has a limited number of colors, held in the color map. However each of these 256 colors can be any combination of 256 values of red, 256 values of green and 256 values of blue (so the 8-bit pixel value is mapped to a 24-bit color). Since there are only 256 possible indices the pixels are encoded as an 8-bit byte. There are 256 colors (max) in the picture, and each pixel is encoded as the index of its color in the "colormap". You may need have to have enough posts under your belt to be able to post links around here.A GIF is color-indexed. Of course, the result is then subject to LZW compression, and if there are fewer values they will compress better (but you won't see a sudden drop when going from 129 to 128, for instance). The size of the color map or the color index of the pixels is not reduced because values fit in 7 or 6 or 4 bits. Yes, WebP supports both types of compression. Ps: what is up with links on this site? (can't post links?). png?Įn | wikipedia | org | wiki | Run - length _ encoding but thanks for the info i wasn't aware that. smaller files seems cool though!Īnd about indexing, you're not suggesting fewer bits doesn't play a role in the final size of the file?! Pixelation | org | index | php ? topic = 48665 | 0. I'm curious about the implications to pixel-art, and confusions like this threads: webp is both lossy and lossless.that might get confusing. I also did a quick test with GIMP 2.10, and it gives me the same error, although the server won't let me upload more than three images apparently.Ĭan anyone tell me what is the cause of my problem? I like to save things in indexed form to keep file-size small(and also for stylistic reason), but I don't necessarily want to sacrifice too much definition, and want to choose the max(256). here is my gif saved as 128 colors(i like powers of 2), it seems unaffected:Īnd here is my messed up gif it I can't get rid of the black background no matter what i do: my background was changed to black, and so was another layer, not sure why this is, or what causes this? i've had the problem before when trying to save a png as 256-color indexed, however, oddly, i don't get the problem if i choose fewer colors. I first optimized for gif, then indexed, and exported, and i still got the error: Sorry I don't have the exact words, although i had the same problem today while trying to export a gif. I get an error message to the effect of ~failed to save transparency, saving opacity instead~. The problem happens only occasionally when i'm exporting my work as 256 color indexed png(or gif). But then I often run into a problem, for which I have yet to identify the cause. saving as opaque.įor starters, I'm wondering why does gimp 2.8.10 default to 255 colors when choosing indexed mode? I always type 256 - i just feel entitled to that one extra color.
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