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-.TH LIBRED_GET_COLOUR 3 LIBRED
-.SH NAME
-libred_get_colour \- Calculate a colour temperature
-.SH SYNOPSIS
-.nf
-#include <libred.h>
-
-int \fBlibred_get_colour\fP(long int \fItemp\fP, double* \fIr\fP, double* \fIg\fP, double* \fIb\fP);
-.fi
-.PP
-Link with
-.IR -lred .
-.SH DESCRIPTION
-.B libred_get_colour
-gets or interpolates the colour temperature for
-.I temp
-kelvins, and returns the colour temperature in sRGB. The values,
-between 0.0 and 1.0, for the "red", green, and blue channels
-are stored in
-.IR *r ,
-.IR *g ,
-and
-.IR *b ,
-respectively.
-.PP
-At least one of the values will be 1.0, none will be greater than
-1.0, and none will be less than 0.0. It is guaranteed (unless the
-resources file has been modified) that
-.IR *r ,
-.IR *g ,
-and
-.I *b
-all will be 1.0 if
-.I temp
-is 6500.
-.PP
-You must call
-.BR libred_init_colour (3)
-before the first use of this function,
-and you should call
-.BR libred_term_colour (3)
-after the last use of this function.
-.SH "RETURN VALUE"
-Upon successful completion, the function returns 0. On failure,
-the function returns -1 and sets
-.B errno
-appropriately.
-.SH ERRORS
-The function may fail if:
-.TP
-.B EOVERFLOW
-The colour temperature lookup table is smaller than it should be.
-.TP
-.B EDOM
-If
-.I temp
-is less than
-.B LIBRED_LOWEST_TEMPERATURE
-(which is 1000.)
-.PP
-The function may also fail for any reason specified for
-.BR pread (3),
-and set the value of
-.B errno
-to the same values.
-.SH "FUTURE DIRECTIONS"
-It is possible that the behaviour is changed to loading the
-colour temperature lookup table rather than just open a
-file descriptor to it.
-.SH "SEE ALSO"
-.BR libred.h (0),
-.BR libred (7),
-.BR libred_init_colour (3),
-.BR libred_term_colour (3)