ppmchange
Replace specific colors in PPM images
TLDR
Change specific color
$ ppmchange [oldcolor] [newcolor] [input.ppm] > [output.ppm]
Change red to blue$ ppmchange red blue [input.ppm] > [output.ppm]
Change multiple colors$ ppmchange [old1] [new1] [old2] [new2] [input.ppm] > [output.ppm]
SYNOPSIS
ppmchange [options] oldcolor newcolor [file]
DESCRIPTION
ppmchange replaces specific colors in PPM images with new colors. Multiple color substitutions can be specified in a single invocation by providing pairs of old and new colors on the command line.
By default, only exact color matches are replaced. The -closeness option allows fuzzy matching by specifying a tolerance value, useful when working with images that have slight color variations due to compression or anti-aliasing. Part of the Netpbm toolkit.
PARAMETERS
OLDCOLOR
Color to replace.NEWCOLOR
Replacement color.FILE
Input PPM file.-closeness N
Color matching tolerance.
CAVEATS
Exact color matching by default. Part of Netpbm suite.
HISTORY
ppmchange was created as part of Netpbm for color replacement.
SEE ALSO
ppmcolormask(1), pnmremap(1), ppm(5)