On Wed, 6 Jul 2005, Matto Marjanovic wrote:
> One thing though: in the frame you sent me, about 10% of the pixels
> are clipped in the initial conversion to R'G'B' --- these are Y'CbCr
> values in the orginal frame which lie outside of the R'G'B' color
> cube. When they are clipped (projected/forced into the R'G'B' cube),
> they will generally appear brighter (the Y' of the clipped pixel will
> be higher than the original Y' value).
The reverse also be, possibly, a problem? When going from R'G'B'
to broadcast range Y'CbCr the clip/core to 16-235 and 16-240 can
cause luma dimming and color shifts (saturated red is particularily
nasty to deal with).
> be no visible transition between the frames with 'effects' and those
> without? Or doing the work in Y'CbCr colorspace [all non-ideal for
> a few reasons]. Or writing tools which will handle negative R'G'B'
Hmmm, that's not what I've found to be the case. Can you elaborate
on why doing all the work in Y'CbCr is non-ideal? So far I've found
doing the rendering/filtering/compositing/etc work in Y'CbCr format
(with 10bit per sample data the math in done with 32bit floating point)
gives fantasically good results.
Cheers,
Steven Schultz
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