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CDLs are very common in VFX workflows because the VFX artist needs both the ungraded shot and the intended look.
The ungraded shot allows the artist to comp in truly linear light, and the intended look is needed to confirm that the
individual plates still hold together after the grade is applied.
SLOPE, OFFSET AND POWER
The three CDL tone curve parameters are Slope, Offset and Power. These algorithms allow the camera to modify the
recorded image.
Slope multiplies the incoming data
Offset is sum of the incoming data
Power is a power function to the incoming data
These three relate to Gain, Lift, and Gamma in the following ways:
Slope = Gain
Gain Adjusts highlights.
Offset = Lift
Lift Increases the value of dark colors.
Power = Gamma
Gamma adjusts midtones.
These three relate to each other in the following ways:
Slope= input x slope
Offset= (input x slope) + offset
Power= ((input x slope) + offset) ^ power
The formula for ASC CDL color correction is:
where
is the color graded pixel code value
is the input pixel code value (0=black, 1=white)
is slope (any number 0 or greater, nominal value is 1.0)
is offset (any number, nominal value is 0)
is power (any number greater than 0, nominal value is 1.0)
The formula is applied to the three color values for each pixel using the corresponding slope, offset, and power
numbers for each color channel.
SATURATION
A fourth parameter “Saturation” is achieved by converting the out data in a Luma and Chroma component. The Chroma
Signal is then multiplied by the “Saturation” parameter.
FILM GRADE AND VIDEO GRADE
With Slope and Offset you can produce both a Film Grade “Exposure” and “Contrast” and a Video Grade “Lift” and
“Gain.”
Exposure is achieved by Offset
Contrast is achieved by a combination of Offset and Slope
Gain is achieved by Slope
Lift is achieved by a combination of Offset and Slope
Gamma is achieved by Power
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