[Cin] Secondary color correction in Blender 2.64

[Andrew Randrianasulu]

Found this post from 2012

https://blenderartists.org/t/selective-secondary-color-correction-using-blender/556293

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browneditor
Nov 2012

Which color node allows direct selective secondary color correction in
blender. I create group nodes with hsv keyer to color balance with a blur
node to soften the range selection. It is very tedious to keep tabbing in
to make small changes. please check my attachments to see if I am going in
the right direction or not.

[...]

blendercomp <https://blenderartists.org/u/blendercomp>
Nov 2012
<https://blenderartists.org/t/selective-secondary-color-correction-using-blender/556293/4>

@Browneditor <https://blenderartists.org/u/browneditor>:
ideally, you would want to use masks for secondary corrections. If you can
easily pull a matte from your plates and use that as a mask then that’s
really cool. In this case, I’d go for a mask, they’re easy to setup and
animate in 2.64.
If you insist on keying to create masks automatically, then it should be
possible to derive a few masks by combining 3 or 4 color key nodes. Just
play around with different ranges of hues per color key node and multiply
the resulting mattes to combine then into a single one to control the area
of interest.

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there is also video note for KDENLIVE

https://www.reddit.com/r/kdenlive/comments/1awa50b/kdenlive_secondary_color_selection/


original documentation for cin-HV notes:

http://heroinewarrior.com/cinelerra/cinelerra.html
12.2 MASKS

Masks define a region of the video to either set opaque or transparent.

Another thing the mask tool does is draw paths. Paths are lines while masks
are areas. Paths can be simple line drawings or outlines.

Masks can be used in conjunction with another effect to isolate the effect
to a certain region of the frame. A copy of one video track may be delayed
slightly and unmasked in locations where the one copy has interference but
the other copy doesn’t. Color correction may be needed in one section of a
frame but not another. A mask can be applied to just a section of the color
corrected track while the vanilla track shows through. Removal of boom
microphones, airplanes, and housewives are other mask uses.

The order of the compositing pipeline affects what can be done with masks.
Mainly, masks are performed on the temporary after effects and before the
projector. This means multiple tracks can be bounced to a masked track and
projected with the same mask.

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*I think* Blue Banana documentation mention internal to plugin mask you can
use for masking out specific color/color ranges, but not sure how you use
it for such case? Are we supposed to build 3 new track  versions for
low/mid/high correction?
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