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+.TH LIBCOLOUR_CIEUVW 7 libcolour
+.SH NAME
+LIBCOLOUR_CIEUVW - CIE 1964 (U*, V*, W*)
+.SH DESCRIPTION
+CIE 1964 (U*, V*, W*) (also known simply as CIE UVW)
+colours are presented with either of
+.nf
+
+	\fBtypedef struct libcolour_cieuvw_f libcolour_cieuvw_f_t;\fP
+	\fBtypedef struct libcolour_cieuvw_lf libcolour_cieuvw_lf_t;\fP
+	\fBtypedef struct libcolour_cieuvw_llf libcolour_cieuvw_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_cieuvw_f
+is defined as
+.nf
+
+	\fBstruct libcolour_cieuvw_f {\fP
+		\fBenum libcolour_model\fP \fImodel\fP\fB;\fP
+		\fBfloat\fP \fIU\fP\fB;\fP
+		\fBfloat\fP \fIV\fP\fB;\fP
+		\fBfloat\fP \fIW\fP\fB;\fP
+		\fBfloat\fP \fIu0\fP\fB;\fP
+		\fBfloat\fP \fIv0\fP\fB;\fP
+	\fB};\fP
+
+.fi
+.I .model
+shall be set to
+.BR LIBCOLOUR_CIEUVW .
+In
+.BR union\ libcolour_colour_f ,
+.BR union\ libcolour_colour_lf ,
+and
+.BR union\ libcolour_colour_llf ,
+.I .cieuvw
+is used for CIE 1964 (U*, V*, W*) colours.
+.P
+.IR .U ,
+.IR .V ,
+.IR .W ,
+.IR .u0 ,
+and
+.I .v0
+hold the U*, V*, W*, u\(aq chromaticity coordinate of a
+\(dqspecified white object\(dq and, v\(aq chromaticity
+coordinate of a \(dqspecified white object\(dq, respectively.
+.P
+.I .u0
+and
+.I .v0
+are not part of the colour, but rather part of the colour space.
+.P
+Y is 0 in black and 1 in white.
+u\(aq is defined as 4X / (X + 15Y + 3Z), and
+v\(aq is defined as 9X / (X + 15Y + 3Z), where
+X, Y, and Z are CIE 1931 XYZ values of the
+\(dqspecified white object\(dq.
+.P
+CIE 1964 (U*, V*, W*) is not additive.
+.SH SEE ALSO
+.BR libcolour (7)
+.SH AUTHORS
+Mattias Andrée
+.RI < maandree@kth.se >