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Re: Color question [message #24476 is a reply to message #19825]

Wed, 04 April 2001 11:21

John-David T. Smith is currently offline

John-David T. Smith
Messages: 384
Registered: January 2000

Senior Member

David Fanning wrote:
>
> R. Kyle Justice (rkj@dukebar.crml.uab.edu) writes:
>
>> 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.
<SNIP>
>> 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

The immediate solution is to use *only* those colors as appear in
countours in the color bar.

And no for loops are needed. You could write:

bar=LINDGEN(200,1000)/(200*100)

or dispense with the chicanery altogether and simply use:

bar=1b#bindgen(10)
TV, bar, 0,0,XSIZE=.5,YSIZE=4,/inches

Using the /inches (or /centimeters) keyword to TV for postscript output
is highly advised.

I get the same pure yellow either way: #ffff00

JD

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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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