Calibrated Software MPEG2-X Create v1 - Manual (Page 19)

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444 to 422 Chroma Sampling
There are two options:

Duplicate Values

Average Next Neighbors (DEFAULT)
This controls how chroma is interpolated when converting from RGB 444 -> YUV 422.
‘Average Neighbors’ will produce
smoother colors when converting ; ‘Duplicate Values’ was added to essentially ‘turn off’ the averaging.
Important Note: The 444 to 422 Chroma Sampling setting will ONLY be used if an application sends RGB data to the
code. If an application sends YUV data for a video frame then the 444 to 422 Chroma Sampling setting will have no
effect on the YUV data being handed to the codec for encoding.
RGB to YUV Gamma Correction
This settings enables you to control how Gamma is handled when converting RGB to YUV.
There are four options:

Off – all Gamma Correction is turned off and the Source Gamma is used from the incoming frame.

CVBuffer Tag '2.22' – The video buffer is ‘tagged’ with 2.22 – this means that QuickTime will auto-correct
incoming video frames to 2.22 Gamma.

CPU Gamma 1.8->2.22 – Source Gamma is requested from the incoming RGB Video Frame; however when
converting from RGB->YUV via CPU a 1.8 to 2.22 Gamma Correction is applied. (1.8 is QuickTime Apple
Platform Gamma for RGB)

CPU Gamma 2.5->2.22 – Source Gamma is requested from the incoming RGB Video Frame; however when
converting from RGB->YUV via CPU a 2.5 to 2.22 Gamma Correction is applied. (2.5 is QuickTime Windows
Platform Gamma for RGB)
Watermark (For Color Testing)
This option watermarks the video in the almost-top-left corner ( the watermark is adjusted about 400 pixels in from the left
side so that it is not covered up by watermarks from our Decode codecs)
– it is IMPORTANT to disable this option when
doing real work as the watermark will be a part of the encoded video – this option is just meant for quick checks for the
user to see what colorspace Calibrated MPEG2-X Create is being handed by the calling application. The watermark is a
black rectangle. The top text will be 8-bit YUV422
– this indicates what the XDCAM video was encoded as. The bottom
text will either say Received 8-bit YUV422, Received 8-bit RGB444, or Received 8-bit RGBA4444 – this indicates the
colorspace of the video frame that the calling application is sending to be encoded.