ppmchange — Change all pixels of one color in a PPM image to another color. More information: <https://netpbm.so

Exchange the first color in each `oldcolor` - `newcolor` pair with the second color

ppmchange {{oldcolor1 newcolor1 oldcolor2 newcolor2 ...}} {{path/to/input.ppm}} > {{path/to/output.ppm}}

Specify how similar colors must be in order to be considered the same

ppmchange -closeness {{percentage}} {{oldcolor1 newcolor1 oldcolor2 newcolor2 ...}} {{path/to/input.ppm}} > {{path/to/output.ppm}}

Replace all pixels not specified in the arguments by a color

ppmchange {{[-r|-remainder]}} {{color}} {{oldcolor1 newcolor1 oldcolor2 newcolor2 ...}} {{path/to/input.ppm}} > {{path/to/output.ppm}}