The American Society of Cinematographers

Loyalty • Progress • Artistry
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Return to Table of Contents September 2009 Return to Table of Contents
The Baader Meinhof Complex
Presidents Desk
Production Slate
CAS Part 2
Page 2
Page 3
ASC-CDL
ASC Close-Up
DVD Playback
What is the ASC CDL?


The ASC Color Decision List is a framework developed by the Society’s Technology Committee that allows the interchange of basic RGB color-correction information between equipment and software made by different manufacturers. Although the basic controls of most color-correction systems are similar, they differ in specific implementation. The terms Lift (for dark tones), Gain (highlights), and Gamma (mid-tones) are commonly used by most color-correction systems, but those definitions may vary in detail from system to system and manufacturer to manufacturer.

To avoid confusion, the ASC proposed a set of three defined transfer functions with unique names: Offset (lift), Slope (gain) and Power (gamma). Each function uses one number for the red channel, a second for the green and a third for the blue. Thus, the three transfer functions for the three color components can collectively be described by nine parameters.  A tenth number, Saturation, was specified in Version 1.2 of the ASC CDL, and is applied to all three channels together.

 

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