Calibrated Software MPEG2-X Create v1 - Manual (Page 18)

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RGB to YUV Matrix
Setting the YUV Matrix enables you to control how RGB is converted to YUV.
There are four RGB to YUV Matrix options:

601 SMPTE (16,235)

601 Full (0,255)

709 SMPTE (16,235)

709 Full (0,255) (DEFAULT)
Generally, 601 equations are used for SD video and 709 equations are used for HD video.
The Full option (the default value) converts RGB, which has black-white levels of 0-255 (0-65536 for 16-bit RGB), to YUV
with black-white levels of 16-235 (64-940 for 10-bit YUV). The SMPTE option will convert RGB to YUV with black-white
levels of 16-235 (64-940 for 10-bit YUV). The Full option is usually the preferred workflow option since RGB is viewed at
having a black/white level of 0-255 for 8-bit RGB material (0-65536 for 16-bit RGB) in most applications. Using the
SMPTE option, users can preserve the super black/white values of YUV data when converting from RGB, but this option
should only be used for specific workflows where you are working with RGB data in the SMPTE range.
Important Note: The RGB to YUV Matrix 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 RGB to YUV Matrix setting will have no effect on the YUV data
being handed to the codec for encoding.