From 986540b65f6eb6d9fed40d7da9e58b9bbcee35ae Mon Sep 17 00:00:00 2001 From: Stefano Sabatini Date: Fri, 1 Feb 2013 18:35:15 +0100 Subject: doc/filters: create a dedicated examples section for lut*, and itemize --- doc/filters.texi | 42 +++++++++++++++++++++++++++++++++--------- 1 file changed, 33 insertions(+), 9 deletions(-) (limited to 'doc') diff --git a/doc/filters.texi b/doc/filters.texi index 3334787fc7..c6f0d249d1 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -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 -- cgit v1.2.3