From 71abbdaeb1bca1c62bbae4cb4d5ccbc1ecea014e Mon Sep 17 00:00:00 2001 From: Mattias Andrée Date: Thu, 8 Jun 2017 00:06:26 +0200 Subject: Add man pages for most colour models MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Mattias Andrée --- LIBCOLOUR_CIEUVW.7 | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 74 insertions(+) create mode 100644 LIBCOLOUR_CIEUVW.7 (limited to 'LIBCOLOUR_CIEUVW.7') diff --git a/LIBCOLOUR_CIEUVW.7 b/LIBCOLOUR_CIEUVW.7 new file mode 100644 index 0000000..6cb42af --- /dev/null +++ b/LIBCOLOUR_CIEUVW.7 @@ -0,0 +1,74 @@ +.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 > -- cgit v1.2.3-70-g09d2