;+
; NAME: getwhite 
; PURPOSE:
; 	return color table index for white, in either X or postscript mode.
; INPUTS:
; KEYWORDS:
; OUTPUTS:
;
; HISTORY:
; 	Began 2005-10-06 20:34:30 by Marshall Perrin 
;-

FUNCTION getwhite,black=black
	if !D.NAME eq "PS" then begin
		white = !p.background
		black = !p.color
	endif else begin
		black = !p.background
		white = !p.color
	endelse
	return, white
end