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Diffstat (limited to 'LIBCOLOUR_YCGCO.7')
| -rw-r--r-- | LIBCOLOUR_YCGCO.7 | 61 |
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diff --git a/LIBCOLOUR_YCGCO.7 b/LIBCOLOUR_YCGCO.7 new file mode 100644 index 0000000..095cb0a --- /dev/null +++ b/LIBCOLOUR_YCGCO.7 @@ -0,0 +1,61 @@ +.TH LIBCOLOUR_YCGCO 7 libcolour +.SH NAME +LIBCOLOUR_YCGCO - YCgCo +.SH DESCRIPTION +YCgCo colours are presented with either of +.nf + + \fBtypedef struct libcolour_ycgco_f libcolour_ycgco_f_t;\fP + \fBtypedef struct libcolour_ycgco_lf libcolour_ycgco_lf_t;\fP + \fBtypedef struct libcolour_ycgco_llf libcolour_ycgco_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_ycgco_f +is defined as +.nf + + \fBstruct libcolour_ycgco_f {\fP + \fBenum libcolour_model\fP \fImodel\fP\fB;\fP + \fBfloat\fP \fIY\fP\fB;\fP + \fBfloat\fP \fICg\fP\fB;\fP + \fBfloat\fP \fICo\fP\fB;\fP + \fB};\fP + +.fi +.I .model +shall be set to +.BR LIBCOLOUR_YCGCO . +In +.BR union\ libcolour_colour_f , +.BR union\ libcolour_colour_lf , +and +.BR union\ libcolour_colour_llf , +.I .ycgco +is used for YCgCo colours. +.P +.IR .Y , +.IR .Cg , +and +.I .Co +hold the Y (luma), Cg (chrominance green), and +Co (chrominance orange) values, respectively. +.P +Y is 0 in black and 1 in white. +.P +YCgCo is additive, since it is linearly isomorphic +to CIE 1931 XYZ. It's white point is the +CIE Standard Illuminant D65. +.SH SEE ALSO +.BR libcolour (7) +.SH AUTHORS +Mattias Andrée +.RI < maandree@kth.se > |