GreyScale
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| − | If {{FuncArg|clip}} is [[YUV]], the chroma channels are simply set to grey (128) – {{FuncArg|matrix}} is not used '''and must | + | If {{FuncArg|clip}} is [[YUV]], the chroma channels are simply set to grey (128) – {{FuncArg|matrix}} is not used '''and must not''' be specified otherwise an error will be thrown. |
See [[Color conversions]] for an explanation of the coefficients. Broadly speaking though, | See [[Color conversions]] for an explanation of the coefficients. Broadly speaking though, | ||
Revision as of 00:04, 18 January 2016
Converts the input clip to greyscale (no color), without changing the color format.
Greyscale(clip clip [, string matrix])
- string matrix = "Rec601"
- In RGB based formats, the conversion produces the luma using the coefficients given in the matrix parameter.
- "Rec601" : Use Rec.601 coefficients (and keeping luma range unchanged)
- "Rec709" : Use Rec.709 coefficients (and keeping luma range unchanged)
- "AVERAGE" : Use averaged coefficients (Y = (R + G + B) / 3)
- In RGB based formats, the conversion produces the luma using the coefficients given in the matrix parameter.
If clip is YUV, the chroma channels are simply set to grey (128) – matrix is not used and must not be specified otherwise an error will be thrown.
See Color conversions for an explanation of the coefficients. Broadly speaking though,
- using Rec709, green contributes more to the output, compared to the default Rec601;
- using Average, blue contributes more.
In all cases, Luma range is not changed (0-255 in → 0-255 out; 16-235 in → 16-235 out)
