Calibrated Software XD Decode v2 - Manual (Page 17)

Page | 18
Report Source Gamma As
Gamma is perhaps one of the most confusing and frustrating features for many users of QuickTime movies in their
workflow. In fact, there are many articles about how differently QuickTime Gamma is treated in various applications. The
ability to adjust the reported Gamma is a feature in the Calibrated{Q} Decode codecs to help you alleviate the problems
associated with QuickTime Gamma.
There are five Source Gamma options:

Native

2.22

2.20

2.50

1.8

Match Destination
QuickTime requires any codec to report the Source Gamma of the video. QuickTime recommends reporting a Gamma of
2.20 for SD YUV and 2.22. for HD YUV and reporting either Apple(1.8) or Window(2.5) Gamma for RGB video, depending
on the platform you are using. The Match Destination setting is unique in the Calibrated{Q} Decode codecs in that the
codec will report the Source Video Gamma for the video as whatever the requested Destination Video Gamma is, thereby
sidestepping the need for QuickTime or other applications to try to match the different Gammas of the Source and
Destination video. This can come in handy if you are converting the YUV source data to RGB destination data.
Match Destination Gamma
There are three Match Destination Gamma options:

No

Yes
 Yes (but No…)
When the Gamma differs between the Source Gamma and Destination Gamma, QuickTime asks the codec if it can match
the Gammas (for example, convert the footage from Source Gamma to Destination Gamma). The default value is Yes
(but no…), which means the codec notifies QuickTime that it will perform Gamma conversions, but in actuality it does not
perform any Gamma conversion.
You can set the Match Destination Gamma option to No, which means the codec cannot perform Gamma conversion.
This option may cause QuickTime to try to perform the Gamma conversion itself. You can also set this option to Yes and
the codec will perform any Gamma conversions. If you set the Report Source Gamma As option to Match Destination,
then the Match Destination Gamma option should not matter since the codec will always report Source and Destination
Gamma as equal.
Default Platform Gamma
There are three options:

Auto (DEFAULT)

Apple Platform Gamma

Windows Platform Gamma
When Auto is selected, QuickTime Windows Platform Gamma of 2.5 is used on Windows computers and QuickTime
Apple Platform Gamma of 1.8 is used on Apple computers when Gamma Correction is enabled. You can override and
swap the default platform values
– this should only be done in advanced workflows.
Chroma Sampling
There are two options:

Duplicate Values

Average Neighbors (DEFAULT)