ASC_CDL

The ASC_CDL operator represents a color transform in the American Society of Cinematographers' Color Decision List format (*.ccc or *.cdl).

An ASC CDL transform consists of a slope-offset-power (SOP) function applied individually to each of the RGB channels, followed by a saturation function applied equally to all channels.

It is an Autodesk extension to the Academy/ASC XML color transform format.

Introduced

Version 1.3.

Contains

Description. Optional, any number.
SOPNode. Optional, no more than one. If absent, no slope-offset-power function is applied.
SatNode. Optional, no more than one. If absent, no saturation function is applied.
DynamicParameter. Optional, no more than one. The param attribute must be set to "DEFAULT_LOOK".

Contained By

ProcessList

Attributes

id, name, bypass, inBitDepth, outBitDepth

See Common Operator Attributes.

style

Determines the formula applied by the operator.

Note: The equations assume that the input and output bit-depths are floating-point. For integers, the values are normalized to [0.0, 1.0]. In other words, the slope, offset, power, and saturation values stored in the CTF file do not depend on the input and output bit depths.

Note: The luma weights assume that the image uses the primaries specified by Rec. 709 (for example, HD and sRGB).

Value	Meaning
`"v1.2_Fwd"`
`"v1.2_Rev"`	The inverse of `"v1.2_Fwd"`.
`"noClampFwd"`	The same as `"v1.2_Fwd"`, but without the two clamp functions. If then no power function is applied.
`"noClampRev"`	The inverse of `"noClampFwd"`.

Example

<ProcessList version="1.3" id="7b42c76a-8c7a-4142-8b6e-1c467084075a">
    <ASC_CDL id="cc01234" inBitDepth="16f" outBitDepth="16f" style="v1.2_Fwd">
        <Description>scene 1 exterior look</Description>
        <SOPNode>
            <Slope>1.000000  1.000000  0.900000</Slope>
            <Offset>-0.030000  -0.020000  0.000000</Offset>
            <Power>1.2500000  1.000000  1.000000</Power>
        </SOPNode>
        <SatNode>
            <Saturation>1.700000</Saturation>
        </SatNode>
    </ASC_CDL>
</ProcessList>