GreyScale: Difference between revisions
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Converts the input clip to greyscale (no color), without changing the color [[Convert|format]]. | |||
{{Template:FuncDef|Greyscale(clip ''clip'' [, string ''matrix''])}} | {{Template:FuncDef|Greyscale(clip ''clip'' [, string ''matrix''])}} | ||
:{{Par2|matrix|string|"Rec601"}} | |||
::Controls the colour coefficients used in RGB→greyscale conversion. | |||
::*"Rec601" : Use Rec.601 coefficients. | |||
::*"Rec709" : Use Rec.709 coefficients. | |||
::*"AVERAGE" : Use averaged coefficients (''Y'' = (R + G + B) / 3). | |||
If {{FuncArg|clip}} is [[YUV]], the chroma channels are simply set to grey (128) – {{FuncArg|matrix}} is not used '''and must be empty'''. | |||
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 | In all cases, Luma range is not changed (0-255 in → 0-255 out; 16-235 in → 16-235 out) | ||
[[Category:Internal filters]] | [[Category:Internal filters]] | ||
[[Category:Levels_and_Chroma_filters]] | [[Category:Levels_and_Chroma_filters]] | ||
Revision as of 02:58, 17 January 2016
Converts the input clip to greyscale (no color), without changing the color format.
Greyscale(clip clip [, string matrix])
- string matrix = "Rec601"
- Controls the colour coefficients used in RGB→greyscale conversion.
- "Rec601" : Use Rec.601 coefficients.
- "Rec709" : Use Rec.709 coefficients.
- "AVERAGE" : Use averaged coefficients (Y = (R + G + B) / 3).
- Controls the colour coefficients used in RGB→greyscale conversion.
If clip is YUV, the chroma channels are simply set to grey (128) – matrix is not used and must be empty.
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)
