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Re: IDL and 24 Bits--help + added question [message #2216 is a reply to message #2211]

Tue, 21 June 1994 10:07

velt
Messages: 19
Registered: June 1994

Junior Member

In article 772209127@imsy1.nrl.navy.mil, grunes@imsy1.nrl.navy.mil (Mitchell R Grunes) writes:
> In article <PWALKER.94Jun20165914@jean-luc.ncsa.uiuc.edu> pwalker@ncsa.uiuc.edu (Paul Walker) writes:
<stuff on pseudo-color on true-color visual deleted>
> ----------NOW FOR MY QUESTION----------
>
> Actually, I have been trying to find a way to simulate 24 bit color for
> TV commands on 8 bit color displays (e.g., Sun, VGA...I think it could
> be done with some fancy dithering, but I don't want to do it). Does
> anyone have (or know of) a routine to do it?
> Mitchell R Grunes (grunes@imsy1.nrl.navy.mil)
> Allied-Signal Technical Services
> c/o Code 7230 Naval Research Lab
>

I don't think there are ready-made programs in IDL to do it. In the documentation
for John Bradley's xv there is mention of
"... ppmquant, written by Jef Poskanzer. This algorithm also uses
a version of Heckbert's median cut algorithm, but is capable of
picking 'better' colors, and it doesn't dither."
This may be an algorithm you want to look into.

Good Luck,
Robert Velthuizen
Digital Medical Imaging Program of the
H. Lee Moffitt Cancer Center and Research Institute at the
University of South Florida.

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[Message index]

		Re: IDL and 24 Bits--help + added question By: grunes on Wed, 22 June 1994 08:16
		Re: IDL and 24 Bits--help + added question By: velt on Wed, 22 June 1994 06:22
		Re: IDL and 24 Bits--help + added question By: thompson on Wed, 22 June 1994 06:04
		Re: IDL and 24 Bits--help + added question By: velt on Tue, 21 June 1994 10:07
		Re: IDL and 24 Bits--help + added question By: grunes on Tue, 21 June 1994 07:32
		Re: IDL and 24 Bits--help + added question By: rmm on Fri, 24 June 1994 08:30

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