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diff --git a/LIBCOLOUR_CIEXYZ.7 b/LIBCOLOUR_CIEXYZ.7 new file mode 100644 index 0000000..cb5cd31 --- /dev/null +++ b/LIBCOLOUR_CIEXYZ.7 @@ -0,0 +1,65 @@ +.TH LIBCOLOUR_CIEXYZ 7 libcolour +.SH NAME +LIBCOLOUR_CIEXYZ - CIE 1931 XYZ +.SH DESCRIPTION +CIE 1931 XYZ (also known simply as CIE XYZ) +colours are presented with either of +.nf + + \fBtypedef struct libcolour_ciexyz_f libcolour_ciexyz_f_t;\fP + \fBtypedef struct libcolour_ciexyz_lf libcolour_ciexyz_lf_t;\fP + \fBtypedef struct libcolour_ciexyz_llf libcolour_ciexyz_llf_t;\fP + +.fi +These +.BR struct s +use +.BR float , +.BR double , +and +.BR long\ double , +respecitively, for the values stored in them, +and are otherwise identical. +.B struct libcolour_ciexyz_f +is defined as +.nf + + \fBstruct libcolour_ciexyz_f {\fP + \fBenum libcolour_model\fP \fImodel\fP\fB;\fP + \fBfloat\fP \fIX\fP\fB;\fP + \fBfloat\fP \fIY\fP\fB;\fP + \fBfloat\fP \fIZ\fP\fB;\fP + \fB};\fP + +.fi +.I .model +shall be set to +.BR LIBCOLOUR_CIEXYZ . +In +.BR union\ libcolour_colour_f , +.BR union\ libcolour_colour_lf , +and +.BR union\ libcolour_colour_llf , +.I .ciexyz +is used for CIE 1931 XYZ colours. +.P +.IR .X , +.IR .Y , +and +.I .Z +hold the unscaled X, Y, and Z values, respectively. +.P +CIE 1931 XYZ is additive, since it is linearly +isomorphic to CIE 1931 RGB, which is additive because +it is an RGB colour space. +.P +This colour model is derived from CIE 1931 RGB and is +used as an intermediary representation when converting +between many colour spaces and colour models, making +it very useful for device independent colour +representation. +.SH SEE ALSO +.BR libcolour (7) +.SH AUTHORS +Mattias Andrée +.RI < maandree@kth.se > |