Re: A Nice Plus

[Shane Ross] "But I do see the total need to have what you see in the NLE match your QT exports. Because QT exports aren't broadcast quality...they are web and computer based, so completely different. I get that. I just don't get using the image you see on the computer display (and the FCX interface) as a guide to what your image will look on TV. Because computer displays and TVs have different color spaces."

RGB/YUV is not reversible with 8-bit processing because you can't encode values below black (0), above white (255), or fractional values (like 123.4567), leading to clipping and quantization.

However, the RGB/YUV transformation is mathematically reversible when using floating point RGB calculation as FCPX does.

With a profiled monitor, ColorSync will translate from the intended theoretical color space (Rec 709) to the actual physical display space. I have read that the iMac displays are very close to Rec. 709, but I don't have any first-hand information there (nor on with what precision ColorSync itself operates).

Walter Soyka
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