På Mon, 05 Nov 2012 14:27:02 +0100, skrev Monty Montgomery
<[email protected]>:
... and presenting 0.0 as black and 1.0 as white internally is
totally out of the question?
No. :-)
However, if black is 0.0, then "super black" would be negative,
and hilarity ensues. So we have to make up our minds about what
headroom and toeroom are for, how to use them, and how to represent
them.
With your proposed studio swing
mapping most compositing and filtering operations have to scale
and bias to work right. E.g. black + black + black will be a
shade of gray, unless a bias is subtracted.
Yup. I was suggesting it as something of a path of least resistance.
For the record, we already have this problem with studio swing.
After some reconsideration, I realised that the kind of black we are
talking about here is "black level" black. Not the matemathical
"black hole" kind of black. The black level isn't "zero luma".
It is "below perceptible luma". And if you add three just below
perceptible lights, you DO get something brighter than pitch black.
This may or may not be what you want. My point is that the
accumulation of noise or fog when you add several black level
signals is the most faithful representation. Because unless
they are synthetical, they will not be crushed/clipped blacks,
but a noise floor.
--
Herman Robak
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