rainbow

Name

rainbow - create a color map based on ihs

Syntax

 rainbow [-ib <ib>] [-ie <ie>] [-hb <hb>]
         [-he <he>] [-sb <sb>] [-se <se>] [-len len]
         <outfile>

Description

Creates a colormap based on IHS-coordinates. You may set start and stop values for ihs.


 for (n=0; n<len; n++) {
   I = ib + (ie-ib) * (double) n / (double) len;
   H = hb + (he-hb) * (double) n / (double) len;
   S = sb + (se-sb) * (double) n / (double) len;
   convert (i, h, s) to (r, g, b)

Default values:

       ib = 0.5,  ie = 0.5
       hb = 1/3,  he = 1.0
       sb = 1.0   se = 1.0
       len = 256

"-" or "-1" may be used for outfile to send the result to stdout.

Restrictions

All values must be in the range 0.0 <= val <= 1.0

Author

Otto Milvang

Examples

 rainbow -ib 0 -ie 1 | mct > mycol.col

Id

$Id: rainbow.c,v 1.20 1996/11/29 15:25:23 svein Exp $