Posted: 2006-07-20T08:10:08-07:00
Try -sampling-factor 2x2 to your command line to produce 4:2:2 YUV image format. You may need to specify -depth 8 as well.
Convert, Edit, or Compose Bitmap Images
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https://legacy.imagemagick.org/discourse-server/viewtopic.php?f=1&t=7026