[Bf-committers] Color correction in sequencer

Peter Schlaile peter at schlaile.de
Thu Dec 11 09:39:35 CET 2008

Hi Campbell,

> found them quite confusing. Even after tweaking them for 5min I don't
> really understand what they do exactly.

take a look at Colorista / Rebel-CC. Maybe they are not intuitive to you,
but they are the standard three way color correction and should work that


> Id much prefer convert these values into either, gimp/photoshop color
> 'Levels' or 'Curves'.
> Curves are already used in other parts of blender so I'ts probably not
> that hard to make this change,

Curves are a nice addition. But Lift/Gamma/Gain should be available, too!

Xavier: thanks for pointing out the problem with lift vs. offset. I was
pretty sure, that I did it wrong, when I coded it, but didn't found a
place, where it really was explained properly... (and blender release was
the next week :) )

So: go ahead, apply your fix! I can also write a patch, but not before
xmas, that's for sure!

The lookup table is only used for byte-values, so it should only affect
speed not quality.

> Peter, if your reading, Could these settings be converted to curves?
> (even a close approximation would be ok I think)

We should add an input prefilter pipeline for that. As Xavier pointed out,
it may be the right time, to think about image processing functions that
are reused across blender.


Peter Schlaile

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