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Re: Color question [message #24479 is a reply to message #19825]

Wed, 04 April 2001 10:15

rkj
Messages: 66
Registered: February 1996

Member

Ok, here is some sample code that will hopefully demonstrate
problem of grainy colors using TV on a postscript device. You
will need a color postscript printer to verify this.

SET_PLOT, 'PS'
DEVICE, Bits_Per_Pixel=8, /Color
TEK_COLOR ; or create your own discrete colormap
bar=BYTARR(200,1000)
FOR i=0,999 DO bar(*,i)=i*9/1000
TV, bar, /Device
PLOT, INDGEN(10), Color=7, Charthick=3, Thick=5, /Noerase
DEVICE, /Close

Print it out and you should see that the plot is a "pure"
yellow but the bar yellow is "grainy."

I guess there is a difference between a plot and an image
on a postscript device. Plots seem to use filled polygons
(which give pure colors) while images appear to use pixels
or dots.

Kyle

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[Message index]

		color question By: R.Bauer on Thu, 20 April 2000 00:00
		Re: Color question By: rkj on Wed, 04 April 2001 11:47
		Re: Color question By: John-David T. Smith on Wed, 04 April 2001 11:21
		Re: Color question By: davidf on Wed, 04 April 2001 10:41
		Re: Color question By: rkj on Wed, 04 April 2001 10:15
		Re: Color question By: Liam E. Gumley on Wed, 04 April 2001 10:02
		Re: Color question By: davidf on Wed, 04 April 2001 09:47
		Re: Color question By: rkj on Wed, 04 April 2001 09:24
		Re: Color question By: Martin Schultz on Wed, 04 April 2001 00:46
		Re: Color question By: davidf on Tue, 03 April 2001 14:38
		Re: Color question By: rkj on Tue, 03 April 2001 14:20
		Re: Color question By: davidf on Tue, 03 April 2001 14:18
		Re: Color Question By: savoie on Fri, 22 November 2002 07:39
		Re: Color Question By: Rodenacker on Fri, 22 November 2002 01:53
		Re: Color Question By: Karsten Rodenacker on Fri, 22 November 2002 01:49

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