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_CIELUV.7 | 77 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 77 insertions(+) create mode 100644 LIBCOLOUR_CIELUV.7 (limited to 'LIBCOLOUR_CIELUV.7') diff --git a/LIBCOLOUR_CIELUV.7 b/LIBCOLOUR_CIELUV.7 new file mode 100644 index 0000000..24d5d88 --- /dev/null +++ b/LIBCOLOUR_CIELUV.7 @@ -0,0 +1,77 @@ +.TH LIBCOLOUR_CIELUV 7 libcolour +.SH NAME +LIBCOLOUR_CIELUV - CIE 1976 (L*, u*, v*) +.SH DESCRIPTION +CIE 1976 (L*, u*, v*) (also known simply as CIE L*u*v*) +colours are presented with either of +.nf + + \fBtypedef struct libcolour_cieluv_f libcolour_cieluv_f_t;\fP + \fBtypedef struct libcolour_cieluv_lf libcolour_cieluv_lf_t;\fP + \fBtypedef struct libcolour_cieluv_llf libcolour_cieluv_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_cieluv_f +is defined as +.nf + + \fBstruct libcolour_cieluv_f {\fP + \fBenum libcolour_model\fP \fImodel\fP\fB;\fP + \fBfloat\fP \fIL\fP\fB;\fP + \fBfloat\fP \fIu\fP\fB;\fP + \fBfloat\fP \fIv\fP\fB;\fP + \fBstruct libcolour_ciexyz\fP \fIwhite\fP\fB;\fP + \fB};\fP + +.fi +.I .model +shall be set to +.BR LIBCOLOUR_CIELUV . +In +.BR union\ libcolour_colour_f , +.BR union\ libcolour_colour_lf , +and +.BR union\ libcolour_colour_llf , +.I .cieluv +is used for CIE L*u*v* colours. +.P +.IR .L , +.IR .u , +and +.I .v +hold the L*, u*, and v* values, respectively, and +.I .white +holds the white point. +.P +L* is 0 in black and 100 in white. +.P +The call +.BI libcolour_proper(& c ) +on a +.B struct libcolour_cieluv_t +.I c +sets +.I c.white.model +to +.BR LIBCOLOUR_CIEXYZ . +Zero is always returned in this case. +.P +CIE L*u*v* is not additive, since conversion from +CIE 1931 XYZ is non-linear. +.P +CIE 1976 (L*, u*, v*) approximates +uniform human colour perception. +.SH SEE ALSO +.BR libcolour (7) +.SH AUTHORS +Mattias Andrée +.RI < maandree@kth.se > -- cgit v1.2.3-70-g09d2