ppmntsc

Make the RGB colors in a PPM image compatible with NTSC or PAL color systems. More information: https://netpbm.sourceforge.net/doc/ppmntsc.html.

ppmntsc path/to/input_file.ppm > path/to/output_file.ppm

ppmntsc --pal path/to/input_file.ppm > path/to/output_file.ppm

ppmntsc --verbose path/to/input_file.ppm > path/to/output_file.ppm

ppmntsc --legalonly|illegalonly|correctedonly path/to/input_file.ppm > path/to/output_file.ppm