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Ppmwheel User Manual(0)                                Ppmwheel User Manual(0)



NAME
       ppmwheel - make a PPM image of a color wheel


SYNOPSIS
       ppmwheel diameter


DESCRIPTION
       This program is part of Netpbm(1).

       ppmwheel  produces  a  PPM  image  of  a color wheel of the specified diameter 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 val-
       ues  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 sec-
       ondary color is one that is composed of light of at most two of the three primary colors.


OPTIONS
       None.


SEE ALSO
       ppmcie(1), ppmrainbow(1), ppm(1)


HISTORY
       ppmwheel was added to Netpbm in Release 10.14 (March 2003).



AUTHOR
       Copyright (C) 1995 by Peter Kirchgessner



netpbm documentation            11 January 2003        Ppmwheel User Manual(0)