ppmtv

Make a PPM Image look like taken from an American TV. Dim every other row of image data down by the specified dim factor (a number between 0 and 1). More information: https://netpbm.sourceforge.net/doc/ppmtv.html.

• Give the PPM image an American TV appearance:

ppmtv dim_factor path/to/file.ppm > path/to/output.ppm

• Suppress all informational messages:

ppmtv -quiet

• Display version:

ppmtv -version