From b51a413074a9844e3c045c743dc1ba56414b6263 Mon Sep 17 00:00:00 2001 From: Mattias Andrée Date: Fri, 2 Dec 2016 23:33:15 +0100 Subject: Add libclut_model_rgb_to_ciexyz and libclut_model_ciexyz_to_rgb MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Mattias Andrée --- doc/info/chap/colour-spaces.texinfo | 75 +++++++++++++++++++++++++++++++++++-- 1 file changed, 72 insertions(+), 3 deletions(-) (limited to 'doc/info') diff --git a/doc/info/chap/colour-spaces.texinfo b/doc/info/chap/colour-spaces.texinfo index e1dfae1..b190ada 100644 --- a/doc/info/chap/colour-spaces.texinfo +++ b/doc/info/chap/colour-spaces.texinfo @@ -895,9 +895,11 @@ This function is not available as a macro, thus, linking with Parameters: @table @code @item const libclut_rgb_colour_space_t* from -Description of the input colour space. +Description of the input colour space. CIE XYZ is +used use if this parameter is @code{NULL}. @item const libclut_rgb_colour_space_t* to -Description of the output colour space. +Description of the output colour space. CIE XYZ is +used use if this parameter is @code{NULL}. @item libclut_colour_space_conversion_matrix_t M Matrix to fill with values so it can be used for converting from the input colour space to the @@ -923,7 +925,7 @@ function. @table @code @item libclut_model_convert_rgb(r, g, b, M, *out_r, *out_g, *out_b) Convert a single RGB colour into another RGB colour space. -The colour space must have same gamma functions as RGB. +The colour space must have same gamma functions as sRGB. This macro is also available a function. If the function is used, linking with @option{-lclut} is required, otherwise, @@ -949,6 +951,7 @@ Output parameter for the green value of the colour after conversion. Output parameter for the blue value of the colour after conversion. @end table + @item libclut_convert_rgb_inplace(clut, max, type, m, trunc) Convert the curves between two RGB colour spaces. @@ -986,6 +989,7 @@ out of gamut are truncated. (Not necessarily the best approximation.) @end table + @item libclut_convert_rgb(clut, max, type, m, trunc, out) Convert the curves between two RGB colour spaces. @@ -1031,3 +1035,68 @@ the same data type as @code{clut}. And have the same values on @code{clut}. @end table @end table + +There is also two functions for converting between a custom RGB +colour space and CIE XYZ, one function in each direction. Note +that the three functions above do not work if one of the colour +spaces is CIE XYZ. + +@table @code +@item libclut_model_rgb_to_ciexyz(r, g, b, M, *X, *Y, *Z) +Convert a single RGB colour if a custom RGB colour space +to CIE XYZ. + +The RGB colour space must have the same gamma function as sRGB. + +This macro is also available a function. If the function is +used, linking with @option{-lclut} is required, otherwise, +linking with @option{-lm} is required, or @option{-lclut} if +@code{libclut_model_standard_to_linear1} is undefined. + +Parameters: +@table @code +@item double r +The red component. +@item double g +The green component. +@item double b +The blue component. +@item libclut_colour_space_conversion_matrix_t M +The conversion matrix. +@item double* X +Output parameter for the X component. +@item double* Y +Output parameter for the Y component. +@item double* Z +Output parameter for the Z component. +@end table + + +@item libclut_model_rgb_to_ciexyz(X, Y, Z, M, *r, *g, *b) +Convert a single colour from CIE XYZ to a custom RGB colour space. + +The RGB colour space must have the same gamma function as sRGB. + +This macro is also available a function. If the function is +used, linking with @option{-lclut} is required, otherwise, +linking with @option{-lm} is required, or @option{-lclut} if +@code{libclut_model_linear_to_standard1} is undefined. + +Parameters: +@table @code +@item double X +The X component. +@item double Y +The Y component. +@item double Z +The Z component. +@item libclut_colour_space_conversion_matrix_t M +The conversion matrix. +@item double* r +Output parameter for the red component. +@item double* g +Output parameter for the green component. +@item double* b +Output parameter for the blue component. +@end table +@end table -- cgit v1.2.3-70-g09d2