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Signed-off-by: Mattias Andrée <maandree@kth.se>

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-@node CLUT Manipulation
-@chapter CLUT Manipulation
-
-@command{libclut} has a number of function-like macros
-for manipulating colour lookup tables. These have
-3 common initial parameters, that describe the
-colour lookup table that shall be manipulated.
-@table @code
-@item clut
-Pointer to the gamma ramps. This must be a pointer
-to an instance of a @code{struct} that must at least
-have the array members @code{red}, @code{green}, and
-@code{blue}, whose elements shall be of the type
-specified by the parameter @code{type}. The @code{struct}
-must also have the scalar members @code{red_size},
-@code{green_size}, and @code{blue_size}, and shall be
-of the type @code{size_t}; they shall specify the
-number of stops (elements) in the arrays @code{.red},
-@code{.green}, and @code{.blue}, respectively, which
-shall be the gamma ramp for the ``red''@footnote{Acutally
-orange.}, green, and blue channels respectively.
-@item max
-The maximum value on each stop in the ramps.
-@item type
-The data type used for each stop in the ramps.
-@end table
-@noindent
-Additionally, these macros do not allow that arguments
-have side-effects.@footnote{Some macros currently allow
-side-effects on some parameters, but this may change
-in the future.} None, if the macros have a return value.
-
-@table @code
-@item libclut_rgb_contrast(clut, max, type, r, g, b)
-Apply contrast correction on the colour curves using sRGB.
-
-In this context, contrast is a measure of difference between
-the whitepoint and blackpoint, if the difference is 0 than
-they are both grey.
-
-Parameters:
-@table @code
-@item r
-The contrast parameter for the red curve.
-@item g
-The contrast parameter for the green curve.
-@item b
-The contrast parameter for the blue curve.
-@end table
-
-
-@item libclut_cie_contrast(clut, max, type, r, g, b)
-Apply contrast correction on the colour curves using CIE xyY.
-
-In this context, contrast is a measure of difference between
-the whitepoint and blackpoint, if the difference is 0 than
-they are both grey.
-
-Requires linking with @option{-lclut}.
-
-Parameters:
-@table @code
-@item r
-The contrast parameter for the red curve.
-@item g
-The contrast parameter for the green curve.
-@item b
-The contrast parameter for the blue curve.
-@end table
-
-
-@item libclut_rgb_brightness(clut, max, type, r, g, b)
-Apply brightness correction on the colour curves using sRGB.
-
-In this context, brightness is a measure of the whiteness
-of the whitepoint.
-
-Parameters:
-@table @code
-@item r
-The brightness parameter for the red curve.
-@item g
-The brightness parameter for the green curve.
-@item b
-The brightness parameter for the blue curve.
-@end table
-
-
-@item libclut_cie_brightness(clut, max, type, r, g, b)
-Apply brightness correction on the colour curves using CIE xyY.
-
-In this context, brightness is a measure of the whiteness
-of the whitepoint.
-
-Requires linking with @option{-lclut}.
-
-Parameters:
-@table @code
-@item r
-The brightness parameter for the red curve.
-@item g
-The brightness parameter for the green curve.
-@item b
-The brightness parameter for the blue curve.
-@end table
-
-
-@item libclut_linearise(clut, max, type, r, g, b)
-Convert the curves from formatted in standard RGB to linear RGB.
-
-Requires linking with @option{-lclut}, or @option{-lm} if
-@code{libclut_model_standard_to_linear1} is not undefined.
-
-Parameters:
-@table @code
-@item r
-Whether to convert the red colour curve.
-@item g
-Whether to convert the green colour curve.
-@item b
-Whether to convert the blue colour curve.
-@end table
-
-
-@item libclut_standardise(clut, max, type, r, g, b)
-Convert the curves from formatted in linear RGB to standard RGB.
-
-Requires linking with @option{-lclut}, or @option{-lm} if
-@code{libclut_model_linear_to_standard1} is not undefined.
-
-Parameters:
-@table @code
-@item r
-Whether to convert the red colour curve.
-@item g
-Whether to convert the green colour curve.
-@item b
-Whether to convert the blue colour curve.
-@end table
-
-
-@item libclut_gamma(clut, max, type, r, g, b)
-Apply gamma correction on the colour curves.
-
-Requires linking with @option{-lm}.
-
-Parameters:
-@table @code
-@item r
-The gamma parameter for the red curve.
-@item g
-The gamma parameter for the green curve.
-@item b
-The gamma parameter for the blue curve.
-@end table
-
-
-@item libclut_negative(clut, max, type, r, g, b)
-Reverse the colour curves (negative image with gamma preservation.)
-
-Parameters:
-@table @code
-@item r
-Whether to reverse the red colour curve.
-@item g
-Whether to reverse the green colour curve.
-@item b
-Whether to reverse the blue colour curve.
-@end table
-
-
-@item libclut_rgb_invert(clut, max, type, r, g, b)
-Invert the colour curves (negative image with gamma
-invertion), using sRGB.
-
-Parameters:
-@table @code
-@item r
-Whether to invert the red colour curve.
-@item g
-Whether to invert the green colour curve.
-@item b
-Whether to invert the blue colour curve.
-@end table
-
-
-@item libclut_cie_invert(clut, max, type, r, g, b)
-Invert the colour curves (negative image with gamma
-invertion), using CIE xyY.
-
-Requires linking with @option{-lclut}.
-
-Parameters:
-@table @code
-@item r
-Whether to invert the red colour curve.
-@item g
-Whether to invert the green colour curve.
-@item b
-Whether to invert the blue colour curve.
-@end table
-
-
-@item libclut_sigmoid(clut, max, type, rp, gp, bp)
-Apply S-curve correction on the colour curves.
-This is intended for fine tuning LCD monitors,
-4.5 is good value start start testing at.
-You would probably like to use @code{rgb_limits}
-before this to adjust the blackpoint as that is
-the only way to adjust the blackpoint on many LCD
-monitors.
-
-Requires linking with @option{-lm}.
-
-Parameters:
-@table @code
-@item rp
-Pointer to the sigmoid parameter for the red curve.
-@code{NULL} for no adjustment.
-@item gp
-Pointer to the sigmoid parameter for the green curve.
-@code{NULL} for no adjustment.
-@item bp
-Pointer to the sigmoid parameter for the blue curve.
-@code{NULL} for no adjustment.
-@end table
-
-
-@item libclut_rgb_limits(clut, max, type, rmin, rmax, gmin, gmax, bmin, bmax)
-Changes the blackpoint and the whitepoint, using sRGB.
-
-Parameters:
-@table @code
-@item rmin
-The red component value of the blackpoint.
-That is, the brightness on the red channel.
-@item rmax
-The red component value of the whitepoint.
-That is, the contrast on the red channel.
-@item gmin
-The green component value of the blackpoint.
-That is, the brightness on the green channel.
-@item gmax
-The green component value of the whitepoint.
-That is, the contrast on the green channel.
-@item bmin
-The blue component value of the blackpoint.
-That is, the brightness on the blue channel.
-@item bmax
-The blue component value of the whitepoint.
-That is, the contrast on the blue channel.
-@end table
-
-
-@item libclut_cie_limits(clut, max, type, rmin, rmax, gmin, gmax, bmin, bmax)
-Changes the blackpoint and the whitepoint, using CIE xyY.
-
-Requires linking with @option{-lclut}.
-
-Parameters:
-@table @code
-@item rmin
-The red component value of the blackpoint.
-That is, the brightness on the red channel.
-@item rmax
-The red component value of the whitepoint.
-That is, the contrast on the red channel.
-@item gmin
-The green component value of the blackpoint.
-That is, the brightness on the green channel.
-@item gmax
-The green component value of the whitepoint.
-That is, the contrast on the green channel.
-@item bmin
-The blue component value of the blackpoint.
-That is, the brightness on the blue channel.
-@item bmax
-The blue component value of the whitepoint.
-That is, the contrast on the blue channel.
-@end table
-
-
-@item libclut_manipulate(clut, max, type, r, g, b)
-Manipulate the colour curves using a function on the
-sRGB colour space.
-
-Parameters:
-@table @code
-@item r
-Function to manipulate the red colour curve. It
-shall map from old stop values to new stop values.
-This should either be @code{NULL} for no manipulation,
-or a function that maps from @code{double} to
-@code{double}. 0 % and 100 % is encoded as 0 and 1,
-respectively, in both input and ouput. Its signature
-should be @code{double (*)(double)}.
-@item g
-Function to manipulate the green colour curve. It
-shall map from old stop values to new stop values.
-This should either be @code{NULL} for no manipulation,
-or a function that maps from @code{double} to
-@code{double}. 0 % and 100 % is encoded as 0 and 1,
-respectively, in both input and ouput. Its signature
-should be @code{double (*)(double)}.
-@item b
-Function to manipulate the blue colour curve. It
-shall map from old stop values to new stop values.
-This should either be @code{NULL} for no manipulation,
-or a function that maps from @code{double} to
-@code{double}. 0 % and 100 % is encoded as 0 and 1,
-respectively, in both input and ouput. Its signature
-should be @code{double (*)(double)}.
-@end table
-
-
-@item libclut_cie_manipulate(clut, max, type, r, g, b)
-Manipulate the colour curves using a function on the
-CIE xyY colour space.
-
-Requires linking with @option{-lclut}.
-
-Parameters:
-@table @code
-@item r
-Function to manipulate the red colour curve. It
-shall map from old stop values to new stop values.
-This should either be @code{NULL} for no manipulation,
-or a function that maps from @code{double} to
-@code{double}. 0 % and 100 % is encoded as 0 and 1,
-respectively, in both input and ouput. Its signature
-should be @code{double (*)(double)}.
-@item g
-Function to manipulate the green colour curve. It
-shall map from old stop values to new stop values.
-This should either be @code{NULL} for no manipulation,
-or a function that maps from @code{double} to
-@code{double}. 0 % and 100 % is encoded as 0 and 1,
-respectively, in both input and ouput. Its signature
-should be @code{double (*)(double)}.
-@item b
-Function to manipulate the blue colour curve. It
-shall map from old stop values to new stop values.
-This should either be @code{NULL} for no manipulation,
-or a function that maps from @code{double} to
-@code{double}. 0 % and 100 % is encoded as 0 and 1,
-respectively, in both input and ouput. Its signature
-should be @code{double (*)(double)}.
-@end table
-
-
-@item libclut_start_over(clut, max, type, r, g, b)
-Resets colour curvers to linear mappings.
-(Identity mapping if imaginged to map from [0, 1] to [0, 1].)
-
-Parameters:
-@table @code
-@item r
-Whether to reset the red colour curve.
-@item g
-Whether to reset the green colour curve.
-@item b
-Whether to reset the blue colour curve.
-@end table
-
-
-@item libclut_clip(clut, max, type, r, g, b)
-Clip colour curves to only map to values between the
-minimum and maximum. This should be done, before apply
-the curves, and before applying changes with limited
-domain.
-
-Values below 0 are set to 0, and values above @code{max}
-are set to @code{max}.
-
-Parameters:
-@table @code
-@item r
-Whether to clip the red colour curve.
-@item g
-Whether to clip the green colour curve.
-@item b
-Whether to clip the blue colour curve.
-@end table
-
-
-@item libclut_lower_resolution(clut, max, type, rx, ry, gx, gy, bx, by)
-Emulates low colour resolution.
-
-Parameters:
-@table @code
-@item rx
-The desired emulated red encoding resolution,
-0 for unchanged.
-@item ry
-The desired emulated red output resolution,
-0 for unchanged.
-@item gx
-The desired emulated green encoding resolution,
-0 for unchanged.
-@item gy
-The desired emulated green output resolution,
-0 for unchanged.
-@item bx
-The desired emulated blue encoding resolution,
-0 for unchanged.
-@item by
-The desired emulated blue output resolution,
-0 for unchanged.
-@end table
-
-
-@item libclut_apply(clut, max, type, filter, fmax, ftype, r, g, b)
-Applies a filter or calibration.
-
-Parameters:
-@table @code
-@item filter
-Same as @code{clut}, but for the filter to apply.
-@item fmax
-Same as @code{max}, but for the filter to apply.
-@item ftype
-Same as @code{type}, but for the filter to apply.
-(Not actually used.)
-@item r
-Whether to apply the filter for the red curve.
-@item g
-Whether to apply the filter for the green curve.
-@item b
-Whether to apply the filter for the blue curve.
-@end table
-
-
-@item libclut_cie_apply(clut, max, type, filter, fmax, ftype, r, g, b)
-Applies a filter or calibration, using CIE xyY.
-
-Requires linking with @option{-lclut}.
-
-Parameters:
-@table @code
-@item filter
-Same as @code{clut}, but for the filter to apply.
-@item fmax
-Same as @code{max}, but for the filter to apply.
-@item ftype
-Same as @code{type}, but for the filter to apply.
-(Not actually used.)
-@item r
-Whether to apply the filter for the red curve.
-@item g
-Whether to apply the filter for the green curve.
-@item b
-Whether to apply the filter for the blue curve.
-@end table
-
-
-@item libclut_translate(dclut, dmax, dtype, sclut, smax, stype)
-Translates a gamma ramp structure to another
-gamma ramp structure type.
-
-Parameters:
-@table @code
-@item dclut
-Like @code{clut} described above, for the destination.
-@item dmax
-Like @code{max} described above, for the destination.
-@item dtype
-Like @code{type} described above, for the destination.
-@item sclut
-Like @code{clut} described above, for the source.
-@item smax
-Like @code{max} described above, for the source.
-@item stype
-Like @code{type} described above, for the source.
-(Not actually used.)
-@end table
-@end table
-