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doc/filters: extend/fix documentation for the geq filter
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@ -4004,25 +4004,31 @@ The filter accepts the following options:
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@table @option
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@item lum_expr
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the luminance expression
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Set the luminance expression.
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@item cb_expr
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the chrominance blue expression
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Set the chrominance blue expression.
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@item cr_expr
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the chrominance red expression
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Set the chrominance red expression.
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@item alpha_expr
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the alpha expression
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Set the alpha expression.
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@item r
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the red expression
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Set the red expression.
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@item g
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the green expression
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Set the green expression.
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@item b
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the blue expression
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Set the blue expression.
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@end table
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The colorspace is selected according to the specified options. If
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one of the @option{lum_expr}, @option{cb_expr}, or @option{cr_expr}
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options is specified, the filter will automatically select a YCbCr
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colorspace. If one of the @option{r}, @option{g}, or @option{b}
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options is specified, it will select an RGB colorspace.
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If one of the chrominance expression is not defined, it falls back on the other
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one. If no alpha expression is specified it will evaluate to opaque value.
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If none of chrominance expressions are
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specified, they will evaluate the luminance expression.
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If none of chrominance expressions are specified, they will evaluate
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to the luminance expression.
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The expressions can use the following variables and functions:
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@ -4058,15 +4064,21 @@ plane.
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@item cb(x, y)
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Return the value of the pixel at location (@var{x},@var{y}) of the
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blue-difference chroma plane. Returns 0 if there is no such plane.
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blue-difference chroma plane. Return 0 if there is no such plane.
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@item cr(x, y)
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Return the value of the pixel at location (@var{x},@var{y}) of the
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red-difference chroma plane. Returns 0 if there is no such plane.
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red-difference chroma plane. Return 0 if there is no such plane.
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@item r(x, y)
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@item g(x, y)
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@item b(x, y)
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Return the value of the pixel at location (@var{x},@var{y}) of the
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red/green/blue component. Return 0 if there is no such component.
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@item alpha(x, y)
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Return the value of the pixel at location (@var{x},@var{y}) of the alpha
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plane. Returns 0 if there is no such plane.
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plane. Return 0 if there is no such plane.
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@end table
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For functions, if @var{x} and @var{y} are outside the area, the value will be
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