@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 time
specified by the parameter @code{type}. The 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'', 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. None, if the macros have a return
value.