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Re: colour conversion 8 -> 24 bit [message #51393]

Tue, 21 November 2006 06:15

Kenneth Bowman
Messages: 86
Registered: November 2006

Member

In article <ejuv22$jf4$1@lc03.rz.uni-jena.de>,
Bringfried Stecklum <stecklum@tls-tautenburg.de> wrote:

> Hello,
>
> it might seem weird but for some reason I want to convert a colour-indexed 8 bit
> image to a true colour one. Since there is no opposite of color_quan I ask
> around how to perform a "colour extension"?

If you have the 8-bit image and color table, just look up the intensities for
each color component in the table. Without actually trying it, something
like this:

image8 = BYTARR(ni, nj) ;Your 8-bit image
table = BYTARR(255, 3) ;Color table for 8-bit image

image24 = BYTARR(ni, nj, 3) ;Empty 24-bit image

image24[0,0,0] = table[image8, 0] ;Red image plane
image24[0,0,1] = table[image8, 1] ;Green image plane
image24[0,0,2] = table[image8, 2] ;Blue image plane

Ken Bowman

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[Message index]

		Re: colour conversion 8 -> 24 bit By: Kenneth Bowman on Tue, 21 November 2006 06:15
		Re: colour conversion 8 -> 24 bit By: David Fanning on Tue, 21 November 2006 06:13
		Re: colour conversion 8 -> 24 bit By: Bringfried Stecklum on Tue, 21 November 2006 11:53

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