xvYCC usage with Cineform at DVinfo.net

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Old February 16th, 2011, 06:00 PM   #1
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xvYCC usage with Cineform

Normal YUV 4:2:2 captured via CF seem to be no problems. However, I am doing a project with 2x camcorders that output xvYCC over HDMI.

Since the output is still 0-254 I would assume even an 8-bit 4:2:2 recorder will take in this data.
How would Cinefom map the extra color data if I converted the file to 10-bit space ?

Would you consider adding a field in the GUI to make CF aware of the extra color data ?

Here is the info from Wikipedia :-
>>
xvYCC-encoded video retains the same color primaries and white point as BT.709, and uses either a BT.601 or BT.709 RGB-to-YCC conversion matrix and encoding. This allows it to travel through existing digital YCC data paths, and any colors within the normal gamut will be compatible.

The xvYCC color space permits YCC values that, while within the encoding range of YCC, have chroma values outside the range 16240, or that correspond to negative RGB values, and hence would not have previously been valid. These are used to encode more saturated colors. For example, a cyan that lies outside the basic gamut of the primaries can be encoded as "green plus blue minus red".[3]
>>
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Old February 16th, 2011, 06:39 PM   #2
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We always encode full range YUV 0 to 255. So no issues.
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Old February 17th, 2011, 02:34 AM   #3
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Thanks for the quick answer. Now, since you have often educated your customers while answering questinos, I will press on. Hope thats OK!


YUV uses 16-240 from the chroma region. xvYCC uses 0-254.Now there is a problem if these have to be converted to RGB, since these chroma values give a negative color value. However, that can be remedied by the video editor deciding how to deal with these values.

If I understand this, CF simply copies over these values, then it is upto the editor (FCP ??) to decide how to deal with these values.

Does FCP actually consider these values during processing, or are they thrown away. I am aware that xvYCC images look REALLY strange on a standard color gamut. However, this is actually 15% extra color information, and I am keen on retaining it.

As far as I know, only the Canon 7D and the Panasonic HDc-SD9 actually output xvYCC via HDMI. I am unsure if any camera currently even captures the xvYCC color to their recording codec.
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