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quru / qis

Dynamic image server for web and print
https://quruimageserver.com
GNU Affero General Public License v3.0
89 stars 7 forks source link

Contrast adjustments #24

Open qururoland opened 5 years ago

qururoland commented 5 years ago

We could easily have contrast adjustment using

convert testimage.jpg -level 0%,75% lighttestimage.jpg convert testimage.jpg -level 25%,100% darktestimage.jpg

See http://www.imagemagick.org/Usage/color_mods/#level for more details.