Quicktime gamma, Important note about 8-bit yuv colorspace – Calibrated Software XD Decode v2 User Manual
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QuickTime Gamma
QuickTime Gamma Correction (by Default ) is TURNED OFF
– we have found that this is what the vast MAJORITY of
users prefer
– however in certain applications this can produce rendered video that is slightly brighter/darker than the
source video usually when rendering to another QuickTime codec - to correct please TURN ON QuickTime Gamma
Correction. Please see the Gamma Settings in the Global Options Chapter.
Important note about 8-bit YUV colorspace
Calibrated{Q} XD Decode supports decoding to 8-bit YUV422 (the colorspace that XD is encoded in
*
) - however it is up to
the application using Calibrated{Q} XD Decode to request 8-bit YUV422 colorspace. Many applications that support
importing MOV files only request 8-bit RGB(A) 444(4) colorspace, which requires a colorspace conversion of YUV->RGB
in the codec
– which slows down performance. Please see the Colorspace Watermark in the Global Options Chapter to
see which colorspace on application is requesting, and also see the Enable 8-bit YUV, Enable High-Precision YUV, and
Enable 16-bit RGB(A) in the Global Options Chapter to learn more about the various colorspace support.
*
XDCAM EX and XDCAM HD 35Mb are encoded using 8-bit YUV4:2:0
– however since the YUV422 colorspace has
much wider support in QuickTime and applications that support QuickTime, YUV422 is used instead of YUV420.
The YUV420 is quickly converted to YUV422 with little loss in performance when 8-bit YUV422 colorspace is
requested from XD Decode by an application.