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ppmrainbow

Generate a rainbow. More information: https://netpbm.sourceforge.net/doc/ppmrainbow.html.

Generate a rainbow consisting of the specified colors:

ppmrainbow {{color1 color2 ...}} > {{path/to/output_file.ppm}}

Specify the size of the output in pixels:

ppmrainbow -width {{width}} -height {{height}} {{color1 color2 ...}} > {{path/to/output_file.ppm}}

End the rainbow with the last color specified, do not repeat the first color:

ppmrainbow -norepeat {{color1 color2 ...}} > {{path/to/output_file.ppm}}