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
CDL POWER
The CDL defines the image settings for the red, green, and blue channel. The three CDL tone curve parameters are
Slope, Offset and Power. These algorithms allow the camera to modify the recorded image. The CDL Power settings
control the power of the Red, Green, Blue, color data.
The Camera LCD Menu for CDL Power:
Use the CDL Power menu to adjust the power of the Red, Green, and Blue CDL data.
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