ppmflash

Brighten a PPM image file. More information: https://netpbm.sourceforge.net/doc/ppmflash.html.

• Generate a PPM image as output that is flashfactor times brighter than the input PPM image:

ppmflash flashfactor path/to/file.ppm > path/to/file.ppm

• Display version:

ppmflash -version