Legacy ImageMagick Discussions Archive

Sorry if this is a simple question, but I can't find info online.

I have substracted two images and would like scale the resulting diff image by some constant to make differences more noticeable. I'd imagine ImageMagick is able to do this, but I can't find the right commands for this. Can anyone point me to the right place, documentation?

You could just use -auto-level. It would automatically stretch the dynamic range to full black and full white.

Alternately, you can use -evaluate multiply X, where X is some multiplier factor.

See
http://www.imagemagick.org/script/comma ... auto-level
http://www.imagemagick.org/script/comma ... p#evaluate

The identical question was asked, and answered, four years ago.

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