Ryan Earl wrote:So I have to memorize that that "video" will have REC709 primaries and that "extended video" will not.
It makes total sense that "BM Film" must be transformed into the working gamma/gamut. REC709, REC2020, P3, whatever. I don't think anyone expects otherwise.
But the general misunderstanding is that "BM Video" and "BM Extended Video" are intended as quick paths to Standard dynamic range REC709 images. "Video" clips highlights, and "Extended" compresses them for a more film like response.
Based on Captain Hook's description, it sounds like "Extended Video" is more like "BM Film" with a different curve, not "BM Video" with a different curve. That's definitely going to confuse a lot of people – and rightly so IMHO.
Compare with Panasonic's approach:
V-LOG ... proprietary log curve and proprietary color space
STANDARD ... REC709 gamma (bt.1886) hard clipped and REC709 color space
LIKE709 ... REC709 color space with compressed highlights. (Kinda like HLG for SDR. Kinda.)
You drop LIKE709 on a REC709 timeline and green is green. Then you grade to taste, no transform required.
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