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