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Diffstat (limited to 'doc/info/chap/colour-spaces.texinfo')
| -rw-r--r-- | doc/info/chap/colour-spaces.texinfo | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/doc/info/chap/colour-spaces.texinfo b/doc/info/chap/colour-spaces.texinfo index a214feb..9455bbc 100644 --- a/doc/info/chap/colour-spaces.texinfo +++ b/doc/info/chap/colour-spaces.texinfo @@ -354,7 +354,7 @@ The wide-gamut RGB colour space, also known as Adobe Wide Gamut RGB. @end table -Call @code{libcolour_proper(&c)} on a +The call @code{libcolour_proper(&c)} on a @code{struct libcolour_rgb_t c} (done automatically for predefined colour spaces) sets @code{c.red.model}, @code{c.green.model}, and @code{c.blue.model} to @@ -521,7 +521,7 @@ The white point. CIE L*u*v* is not additive, since conversion from CIE 1931 XYZ is non-linear. -Call @code{libcolour_proper(&c)} on a +The call @code{libcolour_proper(&c)} on a @code{struct libcolour_cieluv_t c} sets @code{c.white.model} to @code{LIBCOLOUR_CIEXYZ}. Zero is always returned in this case. @@ -555,15 +555,20 @@ The C*@sub{uv} value, the chroma. The h@sub{uv} value, the hue. @item struct libcolour_ciexyz white The white point. +@item double one_revolution +The value lowest positive values of @code{h} that is equivalent to 0. +360 if the hue is measured in degrees, 400 if the hue is measured in +gon, and 2 pi if the hue is measured radian. Any value can be used. @end table CIE LCh@sub{uv} is not additive. It is a cylindrical representation of CIE 1976 (L*, u*, v*). -Call @code{libcolour_proper(&c)} on a +The call @code{libcolour_proper(&c)} on a @code{struct libcolour_cielchuv_t c} sets -@code{c.white.model} to @code{LIBCOLOUR_CIEXYZ}. -Zero is always returned in this case. +@code{c.white.model} to @code{LIBCOLOUR_CIEXYZ}, +and if @code{c.one_revolution} is 0, it is set +to 360. Zero is always returned in this case. @node YIQ |