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Originally Posted by KevinH
Some gif files use different compression settings (not lzw to get around license concerns) and my guess is some software can not properly decompress some gif formats.
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All my images were designed in InkScape, exported as pngs and bulk converted to gifs using ImageMagick's mogrify command.
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Maybe run a gif test/validation program to see what it says?
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Do you have a suggestion for a program?
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Some early gifs with transparent layers also give some software fits.
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I didn't flatten the images because I wanted to retain transparency for the sake of those e-readers who use a colored page background (like I do). That avoids each image being apparently on a white background against, say, a pale green page. I know Amazon screws around with images so that's tough on their clients.
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This is why png has almost completely replaced gifs (as gifs used to require a proprietary license and was patent restricted).
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I was there when gifs were proprietary but now they're not. I converted to gifs because all the images are black and white line drawings and the gif version is about 20% of the size of the png.