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Re: write_GIF, PNG: incomplete palette [message #33306]

Mon, 16 December 2002 11:02

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Streun Andreas (andreas.streun@psi.ch) writes:

> when writing PNGs (or GIFs in IDL<5.4) I don't get
> the full 256 color palette but only something like
> 69 colors. As far as I know GIFs can have up to 256
> colors. Any idea what's the problem?

There are several things that can be going wrong.
Just a glance at your code shows TVRD() calls and no
DEVICE, DECOMPOSED calls, so that is enormously
suspicious.

Have you tried my TVREAD procedure? If that doesn't
produce correct PNG and GIF files, then we *know*
something is wrong. :-)

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

Cheers,

David
--
David W. Fanning, Ph.D.
Fanning Software Consulting, Inc.
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155

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		Re: write_GIF, PNG: incomplete palette By: David Fanning on Mon, 16 December 2002 11:02
		Re: write_GIF, PNG: incomplete palette By: wmconnolley on Mon, 16 December 2002 10:36

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