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by k33l0r 5333 days ago
ImageMagick also has a -thumbail option that you can use in place of -resize:

This is similar to -resize, except it is optimized for speed and any image profile, other than a color profile, is removed to reduce the thumbnail size. To strip the color profiles as well, add -strip just before of after this option.

http://www.imagemagick.org/script/command-line-options.php#t...