RepoMirrors/ffmpeg
1
0
Fork 0
mirror of https://git.ffmpeg.org/ffmpeg.git synced 2025-02-18 12:56:56 +00:00
Code Issues Projects Releases Wiki Activity

doc/filters: add details and ranges for colorkey

Browse Source
This commit is contained in:
Gyan Doshi 2021-11-15 17:16:56 +05:30
parent 23a1f11d02
commit 9e8cdb24cd
1 changed files with 16 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
doc/filters.texi
View File

@ -8496,25 +8496,31 @@ This filter supports the all above options as @ref{commands}.
@section colorkey
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:
@table @option
@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
Similarity percentage with the key color.
0.01 matches only the exact key color, while 1.0 matches everything.
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
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
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.
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.
Higher values result in semi-transparent pixels, with greater transparency
the more similar the pixel color is to the key color.
Range is 0.0 to 1.0. Default is @code{0.0}.
@end table
@subsection Examples