3D3D5F02.BB235644@gmx.de...
> You probably mean what's called 'Tonwertkorrektur' in german PS.  It
> specifies which colors in the original image are supposed to be white,
> black and 50% gray in the result.  I'm not yet sure how this is handled
> internally, but it surely would be an interesting function.

In fact Picture Publisher and the Gimp have it too (so I suppose that the
code is available). It's the function I use most for color correction, as it
is very fast and flexible and gives the user a lot of control (there's also
an "automatic" mode).

G.


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