GreyScale
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| − | If {{FuncArg|clip}} is [[YUV]], the chroma channels are simply set to grey (128 | + | If {{FuncArg|clip}} is [[YUV]], the chroma channels are simply set to grey (128{{D}}) – {{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, | ||
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:*using ''Average'', '''blue''' contributes more. | :*using ''Average'', '''blue''' contributes more. | ||
| − | In all cases, Luma range is not changed (0-255 | + | In all cases, Luma range is not changed (0{{D}}-255{{D}} in → 0{{D}}-255{{D}} out; 16{{D}}-235{{D}} in → 16{{D}}-235{{D}} out) |
[[Category:Internal filters]] | [[Category:Internal filters]] | ||
[[Category:Levels_and_Chroma_filters]] | [[Category:Levels_and_Chroma_filters]] | ||
Revision as of 22:27, 28 April 2017
Converts the input clip to greyscale (no color), without changing the color format.
UK (Greyscale) and US (Grayscale) spellings are both allowed.
Greyscale(clip clip [, string matrix])
Grayscale(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 (HD) coefficients (and keeping luma range unchanged)
- "Rec2020" : Use Rec.2020 (UHD) coefficients (and keeping luma range unchanged) AVS+
- "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 (128d) – 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 (0d-255d in → 0d-255d out; 16d-235d in → 16d-235d out)
