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Use https://github.com/ImageMagick/ImageMagick/discussions instead.
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Creating a non-transparent thumbnail from a transparent GIF

https://imagemagick.com/discourse-server/viewtopic.php?t=6184

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Posted: 2006-03-24T10:04:52-07:00
by magick
Use this command to resize your image:
  • convert C:\tiscali.gif +matte -thumbnail 40x40 C:\tiscali_sm.gif

Posted: 2006-03-26T22:07:50-07:00
by anthony
If you want a specifc color for the background use

Code: Select all

   convert C:\tiscali.gif  -background white -flatten \
              -thumbnail 40x40 C:\tiscali_sm.gif
WARNING: -flatten will not work with GIF animations as is. But then
Neither will +matte
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