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diff --git a/doc/filters.texi b/doc/filters.texi index 88f6093049..044876c7c7 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -3707,6 +3707,51 @@ boxblur=luma_radius=min(h\,w)/10:luma_power=1:chroma_radius=min(cw\,ch)/10:chrom @end example @end itemize +@section chromakey +YUV colorspace color/chroma 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. + +@item yuv +Signals that the color passed is already in YUV instead of RGB. + +Litteral colors like "green" or "red" don't make sense with this enabled anymore. +This can be used to pass exact YUV values as hexadecimal numbers. +@end table + +@subsection Examples + +@itemize +@item +Make every green pixel in the input image transparent: +@example +ffmpeg -i input.png -vf chromakey=green out.png +@end example + +@item +Overlay a greenscreen-video on top of a static black background. +@example +ffmpeg -f lavfi -i color=c=black:s=1280x720 -i video.mp4 -shortest -filter_complex "[1:v]chromakey=0x70de77:0.1:0.2[ckout];[0:v][ckout]overlay[out]" -map "[out]" output.mkv +@end example +@end itemize + @section codecview Visualize information exported by some codecs. |