ppmwheel

Updated: 03 February 2019
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NAME

ppmwheel - make a PPM image of a color wheel

SYNOPSIS

ppmwheel diameter [{-huevalue | -huesaturation}] [-maxval=N]

DESCRIPTION

This program is part of Netpbm.

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 values and saturations are distributed radially.

You can generate three kinds of color wheel:

ARGUMENTS

You must specify one non-option argument: the radius of the color wheel in pixels.

This is also the height and width of the output image.

OPTIONS

In addition to the options common to all programs based on libnetpbm (most notably -quiet, see Common Options), ppmwheel recognizes the following command line options:

-huevalue
This selects a hue-value color wheel.

This option was new in Netpbm 10.86 (March 2019).

-huesaturation
This selects a hue-saturation color wheel.

This option was new in Netpbm 10.86 (March 2019).

-maxval=N
This selects the maxval for the image. The default is 255.

This option was new in Netpbm 10.86 (March 2019).

SEE ALSO

ppmcie, ppmrainbow, ppm

HISTORY

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

AUTHOR

Copyright (C) 1995 by Peter Kirchgessner

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