[Bf-committers] Color correction in sequencer

Xavier Thomas xavier.thomas.1980 at gmail.com
Thu Dec 11 15:57:03 CET 2008

Glad to see you,

I was just thinking in a "filter stack" just like the modifier stack but for
image :)

Concerning the UI: Do tou think it is acceptable to have a UI "button" (with
3 discs, 3sliders and maybe 3 color piker) that manimuplate a float[9] array
or float[3][3] array (like the color button do with float[3] but with bigger

So this UI button can be used int the pannels and fill directly the float
array with ASC CDL compliant values (slope, offset, power)
That way also jus these 9 float need to be saved in the file.

2008/12/11 Peter Schlaile <peter at schlaile.de>

> 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
> way.
> http://rebelsguide.com/forum/viewtopic.php?t=810
> http://prolost.blogspot.com/2006/10/rebel-cc.html
> http://prolost.blogspot.com/2006/12/why-colorista.html
> > 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.
> Chears,
> Peter
> ----
> Peter Schlaile
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