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 {{[-s|-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 {{[-va|-value]}} {{value_percent}} {{path/to/image.pam}} > {{path/to/output.pam}}