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Re: Tiff images with "short" Palette? [message #73865 is a reply to message #73864]

Tue, 07 December 2010 12:32

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Matt writes:

> The problem is that when someone opens my geotiffs in arcview, a whole
> black palette is displayed as 253 colors that aren't used. It's not
> just the return vector that looks like it has 255 elements in it, I
> believe the tiff file is stored with 255 when I've only asked it to
> store 2 values.

Zeros are more likely, don't you think? Especially
if things turn black on the other end.

Yes, I think a "color vector" is 256 elements in length
whether you fill 2 or 100 colors.

> Is this too much to ask for? Is it against the spec?

Hard to say if it is against the spec, I've never read it.
But I don't think you are going to be able to make what you
want in IDL. At least I don't know any way to.

Cheers,

David

P.S. Hard to fault ArcView for loading the color table
vectors. That's what I would do, too. :-(

--
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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[Message index]

		Re: Tiff images with "short" Palette? By: Matt[2] on Tue, 07 December 2010 14:21
		Re: Tiff images with "short" Palette? By: David Fanning on Tue, 07 December 2010 12:32
		Re: Tiff images with "short" Palette? By: Matt[2] on Tue, 07 December 2010 12:26
		Re: Tiff images with "short" Palette? By: David Fanning on Tue, 07 December 2010 12:13
		Re: Tiff images with "short" Palette? By: jeanh on Wed, 08 December 2010 07:26
		Re: Tiff images with "short" Palette? By: Bruce Bowler on Wed, 08 December 2010 05:35

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