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Diffstat (limited to 'doc/filters.texi')
| -rw-r--r-- | doc/filters.texi | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/doc/filters.texi b/doc/filters.texi index 965756c003..cfff9b1f4d 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -19103,6 +19103,39 @@ Apply erosion filter with threshold0 set to 30, threshold1 set 40, threshold2 se @end example @end itemize +@section colorkey_opencl +RGB colorspace color keying. + +The filter accepts the following options: + +@table @option +@item color +The color which will be replaced with transparency. + +@item similarity +Similarity percentage with the key color. + +0.01 matches only the exact key color, while 1.0 matches everything. + +@item blend +Blend percentage. + +0.0 makes pixels either fully transparent, or not transparent at all. + +Higher values result in semi-transparent pixels, with a higher transparency +the more similar the pixels color is to the key color. +@end table + +@subsection Examples + +@itemize +@item +Make every semi-green pixel in the input transparent with some slight blending: +@example +-i INPUT -vf "hwupload, colorkey_opencl=green:0.3:0.1, hwdownload" OUTPUT +@end example +@end itemize + @section overlay_opencl Overlay one video on top of another. |