doc/filters: create a dedicated examples section for lut*, and itemize

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Stefano Sabatini 2013-02-01 18:35:15 +01:00
parent 902fa77fd7
commit 986540b65f
1 changed files with 33 additions and 9 deletions

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@ -3348,34 +3348,58 @@ expression
All expressions default to "val".
Some examples follow:
@subsection Examples
@itemize
@item
Negate input video:
@example
# negate input video
lutrgb="r=maxval+minval-val:g=maxval+minval-val:b=maxval+minval-val"
lutyuv="y=maxval+minval-val:u=maxval+minval-val:v=maxval+minval-val"
@end example
# the above is the same as
The above is the same as:
@example
lutrgb="r=negval:g=negval:b=negval"
lutyuv="y=negval:u=negval:v=negval"
@end example
# negate luminance
@item
Negate luminance:
@example
lutyuv=y=negval
@end example
# remove chroma components, turns the video into a graytone image
@item
Remove chroma components, turns the video into a graytone image:
@example
lutyuv="u=128:v=128"
@end example
# apply a luma burning effect
@item
Apply a luma burning effect:
@example
lutyuv="y=2*val"
@end example
# remove green and blue components
@item
Remove green and blue components:
@example
lutrgb="g=0:b=0"
@end example
# set a constant alpha channel value on input
@item
Set a constant alpha channel value on input:
@example
format=rgba,lutrgb=a="maxval-minval/2"
@end example
# correct luminance gamma by a 0.5 factor
@item
Correct luminance gamma by a 0.5 factor:
@example
lutyuv=y=gammaval(0.5)
@end example
@end itemize
@section mp