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Re: White and black colours appearing when selecting colour table [message #91965 is a reply to message #91961]

Wed, 23 September 2015 12:57

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

liam.steele@gmx.co.uk writes:

> I am wanting to draw a certain number of contours, each with a different colour ranging from blue to red. However, when I select the colour table and set the number of colours, I get a random white and black line appearing.
>
> I've included a simple example below, and the resulting image I get can be found here: http://s7.postimg.org/bm8svkbnv/idl.png
>
> I know there is obviously something simple I'm forgetting to do, but I just can't think what it is!

If you really *have* to use indexed color (and there has been no reason
to since, I don't know, the turn of the century, probably), then you are
going to have to load your color table before you try to do anything
that uses those colors.

You would find life SO much easier it you turned color decomposition on
and just used Coyote Library routines to do your plotting. Everything
will just *work* then, without you having to spend any time thinking
about it. :-)

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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