"Dr. Johannes Zellner" <johan...@zellner.org> writes:

> Hi,
>
> I'd like to apply a wavelength-dependent attenuation function to an image.

In complement to Johannes' answer, you may want to try the color zones
module, select by hue, luminosity tab. No wavelength, but you have the
colors there.

However, it doesn't really do what you're looking for: for example, a
white image should be transformed into a slightly colored image (eg. if
you have a better transmission for blue than for red, the white will be
turned into a light blue).

-- 
Matthieu Moy
http://www-verimag.imag.fr/~moy/

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