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| author | Mattias Andrée <maandree@kth.se> | 2017-06-08 00:06:26 +0200 |
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| committer | Mattias Andrée <maandree@kth.se> | 2017-06-08 00:06:26 +0200 |
| commit | 71abbdaeb1bca1c62bbae4cb4d5ccbc1ecea014e (patch) | |
| tree | 1cb49119012e5aa87355d3576d64588b8f6efd53 /LIBCOLOUR_YPBPR.7 | |
| parent | Add libcolour.7 and macros for testing existance of definitions (diff) | |
| download | libcolour-71abbdaeb1bca1c62bbae4cb4d5ccbc1ecea014e.tar.gz libcolour-71abbdaeb1bca1c62bbae4cb4d5ccbc1ecea014e.tar.bz2 libcolour-71abbdaeb1bca1c62bbae4cb4d5ccbc1ecea014e.tar.xz | |
Add man pages for most colour models
Signed-off-by: Mattias Andrée <maandree@kth.se>
Diffstat (limited to 'LIBCOLOUR_YPBPR.7')
| -rw-r--r-- | LIBCOLOUR_YPBPR.7 | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/LIBCOLOUR_YPBPR.7 b/LIBCOLOUR_YPBPR.7 new file mode 100644 index 0000000..380e1e4 --- /dev/null +++ b/LIBCOLOUR_YPBPR.7 @@ -0,0 +1,66 @@ +.TH LIBCOLOUR_YPBPR 7 libcolour +.SH NAME +LIBCOLOUR_YPBPR - YPbPr +.SH DESCRIPTION +YPbPr [the \(aqb\(a and the \(aqr\(aq should be in subscript and capitalised] +colours are presented with either of +.nf + + \fBtypedef struct libcolour_ypbpr_f libcolour_ypbpr_f_t;\fP + \fBtypedef struct libcolour_ypbpr_lf libcolour_ypbpr_lf_t;\fP + \fBtypedef struct libcolour_ypbpr_llf libcolour_ypbpr_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_ypbpr_f +is defined as +.nf + + \fBstruct libcolour_ypbpr_f {\fP + \fBenum libcolour_model\fP \fImodel\fP\fB;\fP + \fBfloat\fP \fIY\fP\fB;\fP + \fBfloat\fP \fIPb\fP\fB;\fP + \fBfloat\fP \fIPr\fP\fB;\fP + \fB};\fP + +.fi +.I .model +shall be set to +.BR LIBCOLOUR_YPBPR . +In +.BR union\ libcolour_colour_f , +.BR union\ libcolour_colour_lf , +and +.BR union\ libcolour_colour_llf , +.I .ypbpr +is used for YPbPr colours. +.P +.IR .Y , +.IR .Pb , +and +.I .Pr +hold the Y (luma), Pb [the \(aqb\(aq should be in +subscript and capitalised], and Pr [the \(aqr\(aq +should be in subscript and capitalised] values, +respectively. +.P +Y is 0 in black and 1 in white. +Pb is the difference between Y and blue. +Pr is the difference between Y and red. +.P +YPbPr 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 > |