ProRes 4444 -- RGB or YCbCr? The L-O-L-A of ProRes?

Good morning!

Im studying the ProRes 4444. Wont you all come on a journey with me?

The spec for ProRes 4444 spec is disappointingly vague, saying it can encode from and decode to either YCbCr or RGB:

4:4:4 is the highest-quality format for preserving chroma detail. In 4:4:4 image

sources, there is no subsampling, or averaging, of chroma information. There are

three unique samples, either Y, CB, and CRor R, G, and B, for every pixel location.

Apple ProRes 4444 XQ and Apple ProRes 4444 fully support 4:4:4 image sources, from

either RGB or YCBCRcolor spaces.

So does anyone know the hard truth on the subject? Does it always store info as RGB, but will encode from YCbCr if fed that, and decode to YCbCr if asked for it?

Practically speaking, Im trying to figure out if ProRes 4444 exported from Flame is really RGB or not, but the more I read, the more I wonder if theres any way to know what youre getting when you encode or decode in any given application. Codecs that go both ways are confusing and scary.

Rob

rob larose| engineer | rock paper scissors |212-255-6446|www.rockpaperscissors.com

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