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