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diff --git a/libcolour_delta_e.3 b/libcolour_delta_e.3 new file mode 100644 index 0000000..84e9d7c --- /dev/null +++ b/libcolour_delta_e.3 @@ -0,0 +1,42 @@ +.TH LIBCOLOUR_DELTA_E 3 libcolour +.SH NAME +libcolour_delta_e - Calculate the delta E*_ab distance +.SH SYNOPSIS +.nf +#include <libcolour.h> + +int \fBlibcolour_delta_e_f\fP(const libcolour_colour_f_t *\fIa\fP, + const libcolour_colour_f_t *\fIb\fP, float *\fIresult\fP); +int \fBlibcolour_delta_e_lf\fP(const libcolour_colour_lf_t *\fIa\fP, + const libcolour_colour_lf_t *\fIb\fP, double *\fIresult\fP); +int \fBlibcolour_delta_e_llf\fP(const libcolour_colour_llf_t *\fIa\fP, + const libcolour_colour_llf_t *\fIb\fP, long double *\fIresult\fP); + +#define \fBlibcolour_delta_e\fP(\fIa\fP, \fIb\fP, \fIresult\fP)\\ + (_Generic((\fIa\fP),\\ + const libcolour_colour_f_t *: \fBlibcolour_delta_e_f\fP(\fIa\fP, \fIb\fP, \fIresult\fP),\\ + const libcolour_colour_lf_t *: \fBlibcolour_delta_e_lf\fP(\fIa\fP, \fIb\fP, \fIresult\fP),\\ + const libcolour_colour_llf_t *: \fBlibcolour_delta_e_llf\fP(\fIa\fP, \fIb\fP, \fIresult\fP))) +.fi +.SH DESCRIPTION +.B libcolour_delta_e +and its non-generic functions calculate the delta E*_ab +.RB [ _ +denotes that the following characters shall be subscripted] +(the distance in CIE L*a*b*) of two colours, and stores the +distance in +.IR *result . +.SH RETURN VALUES +Upon successful completion, the functions returns 0. +Otherwise the function return -1 with +.I errno +set to indicate the error. +.SH ERRORS +These functions fail if and only if +.BR libcolour_convert (3) +fails. +.SH SEE ALSO +.BR libcolour (7) +.SH AUTHORS +Mattias Andrée +.RI < maandree@kth.se > |