Re: Changing colour of a chair

Couple of observations.
Vocabulary first. "RED space" is actually a technical term now, describing the gamut occupied by the media produced by the RED_One digital cinema camera. I'd be careful splashing that terminology around when what's probably meant is: the segment/vector of any particular colourspace influenced by the red color component.

But within any definition of values, which is why I'm hoping I won't be taken as a pedantic snob in this discussion, there are values that simply cannot be replicated. Pantone values are one of them, in that they do not translate to video. They are a dye/pigment print/paint system. There is a component of reflectivity associated that does not exist in video at all, which is an emissive medium. On this point it is case closed. You are trying to teach a fish how to pedal a bicycle... thank you Gloria Steinem.

And speaking of fish and bicycles, Curves are not compatible with user shapes or vignettes. You are stuck with an HSL isolation, probably helped out by a tight user shape, if the range of values can be pulled together without giving itself away -- and this will be dependent on how robust the originating media is. I'm betting its not Uncompressed 10-bit RGB Dual-Link HDCamSR.

This reminds me of a project from about 9 or 10 years ago (?) involving a RED Toyota Prius that would have been cheaper to paint green, than it was to roto the whole spot so that it appeared to be that way. Yes, driving through clouds of dust, too... and across an overhead trussed bridge that was casting shadows as it drove through. and so on and so forth.
And even though the car is available in that color, there was only a red example available, and yes, we did have to try to match the Toyota (pantone) approved shade. The real trick was the brake lights. You know what color they usually are....

jPo




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