Inverting an Image with Image Magick
Three ways to invert an image:
convert black-white.png -negate white-black.png convert upside-down.png -rotate 180 rightside-up.png convert upside-down.png -flip rightside-up.png
| source: | http://www.imagemagick.org/pipermail/magick-users/2003-October/011071.html |
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