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Re: how can I preserve colours when reading pixels with tvrd function [message #61866 is a reply to message #61846]

Thu, 07 August 2008 04:55

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

bam writes:

> I am using tvrd to capture the contents of an idl direct graphics
> window [idl code: im=tvrd(0,0,500,500) ], on which I have a
> combination of graphics, including plotted lines, xyouts text and a
> background display of a byte array with a colortable. the output of
> tvrd is a grayscale image that has lost all the colors in my original
> window...
> so how can i preserve the contents of my window and perhaps even save
> it as a gif, without distorting the colors of my colortable?

The short answer? Use TVREAD instead:

IDL> void = TVRead(/GIF)

You can find TVRead here:

http://www.dfanning.com/programs/tvread.pro

You can find the long answer inside the TVREAD code. :-)

Cheers,

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

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		Re: how can I preserve colours when reading pixels with tvrd function By: Jeremy Bailin on Fri, 08 August 2008 03:49
		Re: how can I preserve colours when reading pixels with tvrd function By: David Fanning on Thu, 07 August 2008 04:55

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