Posted: 2006-03-09T08:32:06-07:00
Try adding -strip to your command line to remove any image profiles from your image and we suspect your final thumbnail image will be at a reasonable size.
Convert, Edit, or Compose Bitmap Images
https://legacy.imagemagick.org/discourse-server/
https://legacy.imagemagick.org/discourse-server/viewtopic.php?f=3&t=6044