The GammaParams element defines the gamma value and optional offset for a Gamma element.
It is an Autodesk extension to the Academy/ASC XML color transform format.
Introduced
Version 1.2.
Contains
No content.
Contained By
Attributes
- channel
- The color channel to apply gamma correction to. Possible values are "R", "G", and "B". Optional.
If this attribute is not specified, the gamma correction is applied to all channels.
- gamma
- The power value to use. Valid values range from 0.1 to 10.0 inclusive. Required.
- offset
- The offset to use. Valid values range from 10–6 to 0.9 inclusive. Optional.
If this attribute is used, the Gamma element's style attribute should be set to "moncurveFwd" or "moncurveRev". If it is not used, the style attribute should be "basicFwd" or "basicRev".
Example
Without Offset
<ProcessList id="9e999646-3e76-4374-814c-e4c46c6438de" version="1.2">
</Matrix>
<Gamma inBitDepth="32f" outBitDepth="12i" style="basicRev">
<GammaParams gamma="2.400000000000000" />
</Gamma>
</ProcessList>
With Offset
<ProcessList id="1b86aac2-1fdb-4dd8-bc6b-54f3551b9bd4" version="1.2">
<Gamma inBitDepth="32f" outBitDepth="32f" style="moncurveFwd">
<GammaParams gamma="2.600000000000000" offset="0.050000" />
</Gamma>
</ProcessList>
Separate Channels
<ProcessList id="id">
<Gamma inBitDepth="32f" outBitDepth="10i" style="basicRev">
<GammaParams channel="R" gamma="2.4" />
<GammaParams channel="G" gamma="2.35" />
<GammaParams channel="B" gamma="2.2" />
</Gamma>
</ProcessList>