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doc/filters: add details and ranges for colorkey

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Gyan Doshi 2021-11-15 17:16:56 +05:30
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doc/filters.texi
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@ -8496,25 +8496,31 @@ This filter supports the all above options as @ref{commands}.
@section colorkey @section colorkey
RGB colorspace color keying. RGB colorspace color keying.
This filter operates on 8-bit RGB format frames by setting the alpha component of each pixel
which falls within the similarity radius of the key color to 0. The alpha value for pixels outside
the similarity radius depends on the value of the blend option.
The filter accepts the following options: The filter accepts the following options:
@table @option @table @option
@item color @item color
The color which will be replaced with transparency. Set the color for which alpha will be set to 0 (full transparency).
See @ref{color syntax,,"Color" section in the ffmpeg-utils manual,ffmpeg-utils}.
Default is @code{black}.
@item similarity @item similarity
Similarity percentage with the key color. Set the radius from the key color within which other colors also have full transparency.
The computed distance is related to the unit fractional distance in 3D space between the RGB values
0.01 matches only the exact key color, while 1.0 matches everything. of the key color and the pixel's color. Range is 0.01 to 1.0. 0.01 matches within a very small radius
around the exact key color, while 1.0 matches everything.
Default is @code{0.01}.
@item blend @item blend
Blend percentage. Set how the alpha value for pixels that fall outside the similarity radius is computed.
0.0 makes pixels either fully transparent or fully opaque.
0.0 makes pixels either fully transparent, or not transparent at all. Higher values result in semi-transparent pixels, with greater transparency
the more similar the pixel color is to the key color.
Higher values result in semi-transparent pixels, with a higher transparency Range is 0.0 to 1.0. Default is @code{0.0}.
the more similar the pixels color is to the key color.
@end table @end table
@subsection Examples @subsection Examples