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Re: White and black colours appearing when selecting colour table [message #91971 is a reply to message #91969]

Thu, 24 September 2015 05:12

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Liam writes:

> I have always plotted this way though, and have never noticed a problem before.
>
> In the example I provided, ccol[60] shows as white, and ccol[82] shows as black. So if I choose to use only 59 colours there is no problem, but any more and the white and then black lines show up.
>
> I'm just stumped as to why it won't work. It has device,decomposed=0, has loaded a set number of colours, and has given them an index. Maybe I should just ignore it and do something else, but it's bugging me!

Those colors are loaded in the color table at the time you call
cgColorbar. Simply load your color table before you make that call. When
you use indexed colors, you can't guarantee your colors are correct,
that the color table hasn't been corrupted, unless you load the colors
immediately before you use them.

Here is an article that might be related:

http://idlcoyote.com/color_tips/lineinct.html

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")

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[Message index]

		White and black colours appearing when selecting colour table By: liam.steele on Wed, 23 September 2015 08:38
		Re: White and black colours appearing when selecting colour table By: David Fanning on Wed, 23 September 2015 12:57
		Re: White and black colours appearing when selecting colour table By: liam.steele on Thu, 24 September 2015 02:24
		Re: White and black colours appearing when selecting colour table By: David Fanning on Thu, 24 September 2015 05:12
		Re: White and black colours appearing when selecting colour table By: liam.steele on Thu, 24 September 2015 05:41
		Re: White and black colours appearing when selecting colour table By: David Fanning on Thu, 24 September 2015 05:46
		Re: White and black colours appearing when selecting colour table By: David Fanning on Thu, 24 September 2015 05:55

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