@end example
@end itemize
+@section eq
+Set brightness, contrast, saturation and approximate gamma adjustment.
+
+The filter accepts the following options:
+
+@table @option
+@item contrast
+Set the contrast value. It accepts a float value in range @code{-2.0} to
+@code{2.0}. The default value is @code{0.0}.
+
+@item brightness
+Set the brightness value. It accepts a float value in range @code{-1.0} to
+@code{1.0}. The default value is @code{0.0}.
+
+@item saturation
+Set the saturation value. It accepts a float value in range @code{0.0} to
+@code{3.0}. The default value is @code{1.0}.
+
+@item gamma
+Set the gamma value. It accepts a float value in range @code{0.1} to @code{10.0}.
+The default value is @code{1.0}.
+
+@item gamma_r
+Set the gamma value for red. It accepts a float value in range
+@code{0.1} to @code{10.0}. The default value is @code{1.0}.
+
+@item gamma_g
+Set the gamma value for green. It accepts a float value in range
+@code{0.1} to @code{10.0}. The default value is @code{1.0}.
+
+@item gamma_b
+Set the gamma value for blue. It accepts a float value in range
+@code{0.1} to @code{10.0}. The default value is @code{1.0}.
+
+@item gamma_weight
+Can be used to reduce the effect of a high gamma value on bright image areas,
+e.g. keep them from getting overamplified and just plain white. It accepts a
+float value in range @code{0.0} to @code{1.0}.A value of @code{0.0} turns the
+gamma correction all the way down while @code{1.0} leaves it at its full strength.
+Default is @code{1.0}.
+
+@end table
+
@section extractplanes
Extract color channel components from input video stream into
The list of the currently supported filters follows:
@table @var
-@item eq2
-@item eq
-@item ilpack
@item softpulldown
@end table
of the corresponding MPlayer filters. For detailed instructions check
the "VIDEO FILTERS" section in the MPlayer manual.
-@subsection Examples
-
-@itemize
-@item
-Adjust gamma, brightness, contrast:
-@example
-mp=eq2=1.0:2:0.5
-@end example
-@end itemize
-
See also mplayer(1), @url{http://www.mplayerhq.hu/}.
@section mpdecimate
makes the spectrum having more range. Acceptable value is [1.0, 7.0].
Default value is @code{3.0}.
+@item gamma2
+Specify gamma of bargraph. Acceptable value is [1.0, 7.0].
+Default value is @code{1.0}.
+
@item fontfile
Specify font file for use with freetype. If not specified, use embedded font.
fontcolor='if(mod(floor(midi(f)+0.5),12), 0x0000FF, g(1))'
@end example
+@item
+Custom gamma, now spectrum is linear to the amplitude.
+@example
+gamma=2:gamma2=2
+@end example
+
@end itemize
@section showspectrum