original size: 130x167
convert.exe original.gif -coalesce original-1.gif
convert.exe -geometry 100x167 original-1.gif output.gif
the image is smaller, but the size is larger, how to fix this?
Convert animated gif result in a large size
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anthony
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You can start by not using -geometry, but use -resize instead. and second, read you image BEFORE modifying them! 
Rezing animations is frught with problems, most of which is due to the color and transparency limitations of GIF. The result also often has optimization problems caused by this too.
The new -ordered-dither color reduction methods should help you fix some of these problems, but I have not organised these facts yet for IM Examples.
Rezing animations is frught with problems, most of which is due to the color and transparency limitations of GIF. The result also often has optimization problems caused by this too.
The new -ordered-dither color reduction methods should help you fix some of these problems, but I have not organised these facts yet for IM Examples.
Anthony Thyssen -- Webmaster for ImageMagick Example Pages
https://imagemagick.org/Usage/
https://imagemagick.org/Usage/