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pambrighten

Change a PAM image's saturation and value. More information: https://netpbm.sourceforge.net/doc/pambrighten.html.

Increase the saturation of each pixel by the specified percentage:

pambrighten -saturation {{value_percent}} {{path/to/image.pam}} > {{path/to/output.pam}}

Increase the value (from the HSV color space) of each pixel by the specified percentage:

pambrighten -value {{value_percent}} {{path/to/image.pam}} > {{path/to/output.pam}}