vis/color/

mg_rgb2index.pro

includes main-level program

Routines

top mg_rgb2index

direct graphics

result = mg_rgb2index(rgb)

Convert RGB coordinates of colors to the decomposed color indices of the colors. Color indices are long integers used in decomposed color in direct graphics where the lowest order byte value is the red value, the next byte is the green value, the next byte is the blue value, and the highest order byte value is unused.

Return value

long or lonarr(n)

Parameters

rgb in required type=bytarr: either bytarr(3) or bytarr(n, 3) array of RGB coordinates of colors

Examples

For example:

  IDL> print, mg_rgb2index([255, 255, 255]), format='(Z06)'   ; white
  FFFFFF
  IDL> print, mg_rgb2index([255, 255, 0]), format='(Z06)'     ; yellow
  00FFFF
  IDL> print, mg_rgb2index([0, 0, 255]), format='(Z06)'       ; blue
  FF0000

Multiple RGB triplets can also be passed to MG_RGB2INDEX in an n by 3 byte array:

  IDL> mg_loadct, 5, /brewer
  % LOADCT: Loading table PuBu (Sequential)
  IDL> tvlct, rgb, /get
  IDL> print, mg_rgb2index(rgb), format='(8Z)'

File attributes

Modification date:	Wed May 14 15:07:15 2014
Lines:	22
Docformat:	rst rst

Personal library of Michael Galloy
Contact me if you have enhancement requests or bug fixes.

mglib

Personal IDL library for M. Galloy