Re: Lookup table question.

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Chikai Ohazama (chikai@talula)
Sun, 15 Aug 1999 23:48:42 -0700 (PDT)

There is a look-up table for each individual channel. Therefore there are
4 tables of 256 values.

________________________________________________________________________
Chikai J. Ohazama, Ph.D. SGI
Member of Technical Staff 2011 N. Shoreline Blvd. ms 525
Advanced Graphics Division Mountain View, CA 94043.1389
                                     Telephone: (650) 933-6533
                                     FAX: (650) 932-0511

On Thu, 12 Aug 1999, Mark Davey wrote:

> Hi,
>
> Could anyone please give me an explanation for how lookup tables work
> when the data is of type RGBA.
> There are therefore many millions of possible RGBA values for each
> voxel. How are these mapped to a lookup table of say, 256 values as is
> the case with the demo
>
> voglRaw 0 256 256 49 ubyte4 -sc 1 1 2 \
> -color -lut 50 55 \
> $DATAPATH/dose+ct10*ima
>
> Here an RGBA data set is loaded and the middle mouse button makes
> changes to a lookup table containing 256, RGBA lookup values.
>
> So, to re-iterate, how is the lookup achieved?
>
> Regards
> Mark...
>
>
>
>
>
>
>
> --
> From: Mark Davey
> Dept. of Medical Physics, UCL.
>
> TEL: +44 (0)171 915 1673.
> FAX: +44 (0)171 837 9279.
>
> Institute of Laryngology and Otology,
> 330 Gray's Inn Road,
> London.
> WC1X 8GE.
>

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