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.
Use https://github.com/ImageMagick/ImageMagick/discussions instead.
https://imagemagick.com/discourse-server/
https://imagemagick.com/discourse-server/viewtopic.php?t=6044