[sane-devel] Reflecta DigiDia 5000 not found

[Olaf Meeuwissen]

Hi,

Reinhard Kotucha writes:

> [...]
> I could probably improve the results if anybody tells me what these
> values mean and how to apply them:
>
>   FilmMatR    1.4234   -0.3230    0.0061   -29.7088;
>   FilmMatG    0.0600    0.9677    0.0719   -31.3147;
>   FilmMatB    0.1562   -0.5104    1.4530   -28.9059;

I'm not sure about the rightmost column but this is a color correction
matrix.  You apply it on the incoming (or gamma corrected?) RGB values
via matrix multiplication like so

 R' = 1.4234 * R + -0.3230 * G + 0.0061 * B + -29.7088
 G' = 0.0600 * R +  0.9677 * G + 0.0719 * B + -31.3147
 B' = 0.1562 * R + -0.5104 * G + 1.4530 * B + -28.9059

R, G, B are the values before correction, R', G' and B' the ones after.
You may have to clamp the results into the [0,255] range (assuming 8bit
samples).

Hope this helps,
--
Olaf Meeuwissen, LPIC-2            FSF Associate Member since 2004-01-27
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