På Fri, 19 Aug 2011 02:54:59 +0200, skrev E Chalaron <[email protected]>:

Hello all

As you probably know I am always looking for solutions to scan negative
films either in super 8 or in 16mm.
So my main problem is to convert a C41 film colors to reversal and it's
not as simple as just inverting, far from it.
The orange bias must removed first (RGBs are 235,172,121).

Have you tried using the histogram effect for that?
It can adjust the response curve for each colour channel.
(It happens to be a colour curve tool, too)

--
Herman Robak

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