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diff --git a/LIBCOLOUR_SRGB.7 b/LIBCOLOUR_SRGB.7 new file mode 100644 index 0000000..fd6f819 --- /dev/null +++ b/LIBCOLOUR_SRGB.7 @@ -0,0 +1,75 @@ +.TH LIBCOLOUR_SRGB 7 libcolour +.SH NAME +LIBCOLOUR_SRGB - Standard RGB +.SH DESCRIPTION +sRGB colours are presented with either of +.nf + + \fBtypedef struct libcolour_srgb_f libcolour_srgb_f_t;\fP + \fBtypedef struct libcolour_srgb_lf libcolour_srgb_lf_t;\fP + \fBtypedef struct libcolour_srgb_llf libcolour_srgb_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_srgb_f +is defined as +.nf + + \fBstruct libcolour_srgb_f {\fP + \fBenum libcolour_model\fP \fImodel\fP\fB;\fP + \fBfloat\fP \fIR\fP\fB;\fP + \fBfloat\fP \fIG\fP\fB;\fP + \fBfloat\fP \fIB\fP\fB;\fP + \fBint\fP \fIwith_transfer\fP\fB;\fP + \fB};\fP + +.fi +.I .model +shall be set to +.BR LIBCOLOUR_SRGB . +In +.BR union\ libcolour_colour_f , +.BR union\ libcolour_colour_lf , +and +.BR union\ libcolour_colour_llf , +.I .srgb +is used for sRGB colours. +.P +.IR .R , +.IR .G , +and +.I .B +hold the red, green, and blue values, respectively, +and shall have a value between 0 and 1, inclusively, +for the colour to be in gamut. +.I .with_transfer +shall be set to a non-zero value if the sRGB transfer +function (\(dqgamma function\(dq) is applied, and zero +otherwise, meaning colours are linearly encoded. +.P +The RGB color model, of which sRGB is a specific colour +space, is an additive colour model, that is, without a +transfer function applied, linearily isomorphic to +CIE 1931 XYZ. +.P +This is the colour model and colour space normally +used on computers, it is however not the colour space +your monitor have, although it is close to it. sRGB +is designed after the human eye, but fails to take +into account how the brain process the input to figure +out which colour it actually receives. +.SH SEE ALSO +.BR libcolour (7), +.BR libcolour_srgb_encode (3), +.BR libcolour_srgb_decode (3) +.SH AUTHORS +Mattias Andrée +.RI < maandree@kth.se > |