ppmcie

Draw a CIE color chart as a PPM image. More information: https://netpbm.sourceforge.net/doc/ppmcie.html.

ppmcie > path/to/output.ppm

ppmcie -cie|ebu|hdtv|ntsc|smpte > path/to/output.ppm

ppmcie -red|green|blue xpos ypos > path/to/output.ppm

ppmcie -full > path/to/output.ppm