Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.atnf.csiro.au/computing/software/gipsy/sub/grxhls.dc3 Дата изменения: Wed Oct 31 05:16:05 2001 Дата индексирования: Fri Jan 16 01:25:55 2009 Кодировка:

Name: GRXHLS

Purpose: convert RGB color to HLS color

Category: GRAPHICS

File: pgplot.src

Author: T.J. Pearson

Use: see description below.

Description:

SUBROUTINE GRXHLS (R,G,B,H,L,S)

GRPCKG: Convert a color specified in the RGB color model to one in
the HLS model. This is a support routine: no graphics I/O occurs.
The inverse transformation is accomplished with routine GRXRGB.
Reference: SIGGRAPH Status Report of the Graphic Standards Planning
Committee, Computer Graphics, Vol.13, No.3, Association for
Computing Machinery, New York, NY, 1979.

Arguments:

R,G,B (real, input): red, green, blue color coordinates, each in the
range 0.0 to 1.0. Input outside this range causes HLS = (0,1,0)
[white] to be returned.
H,L,S (real, output): hue (0 to 360), lightness (0 to 1.0), and
saturation (0 to 1.0).

Updates: Oct 16, 1998: JPT automatically extracted from source.