This program is part of Netpbm.
ppmwheel produces a PPM image of a color wheel of the specified diame-
ter inside a white square just large enough to hold it.
The color wheel is based on the HSV color model. Hues are distributed
angularly around the circle and the values are distributed radially
and the saturation is zero everywhere. The values are zero at the
center, increasing linearly to maximum at the edge. The maximum value
corresponds to the maxval of the PPM image.
Hence, the image contains all of the secondary colors based on the
red, green, and blue primary colors. A secondary color is one that is
composed of light of at most two of the three primary colors.
ppmcie, ppmrainbow, ppm
ppmwheel was added to Netpbm in Release 10.14 (March 2003).
Copyright (C) 1995 by Peter Kirchgessner
netpbm documentation 11 January 2003 Ppmwheel User Manual(0)