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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