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Greyscale(clip *clip* [, string *matrix*])

Converts a clip to greyscale (without changing the color format).

The conversion is done using Rec.601 coefficients. In v2.56, a *matrix* option is added. When setting *matrix*="Rec.709", the clip is converted to greyscale using Rec.709 coefficients. See ColorConversions for an explanation of these coefficients. When setting *matrix*="Average" (only for RGB clips) the luma is calculated as (R+G+B)/3.