Found this post from 2012 https://blenderartists.org/t/selective-secondary-color-correction-using-blen... ===== 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. ==== quote end ==== there is also video note for KDENLIVE https://www.reddit.com/r/kdenlive/comments/1awa50b/kdenlive_secondary_color_... 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. ==== *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?