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Diffstat (limited to 'doc/info/chap/colour-spaces.texinfo')
| -rw-r--r-- | doc/info/chap/colour-spaces.texinfo | 465 |
1 files changed, 450 insertions, 15 deletions
diff --git a/doc/info/chap/colour-spaces.texinfo b/doc/info/chap/colour-spaces.texinfo index 7b9d751..e1dfae1 100644 --- a/doc/info/chap/colour-spaces.texinfo +++ b/doc/info/chap/colour-spaces.texinfo @@ -8,7 +8,10 @@ @command{libclut} has a number of functions for converting between colour space models. The supported colour space models -are [0, 1] sRGB, [0, 1] linear RGB, CIE xyY, CIE XYZ, and CIE Lab. +are [0, 1] sRGB, [0, 1] linear sRGB, CIE xyY, CIE XYZ, CIE L*a*b*, +CIE 1976 (L*, u*, v*), CIELCh@sub{uv}, YIQ, YD@sub{b}D@sub{r}, +YP@sub{b}P@sub{r}, YCgCo, CIE 1960 USC, CIE U*V*W*, + These functions are implemented as macros, but regular functions are available either by putting the name in the function is brackets, taking the address of the function, or by undefining @@ -21,9 +24,9 @@ linking with @option{-lm}. @table @code @item double libclut_model_linear_to_standard1(double c) -Convert one component from [0, 1] linear RGB to [0, 1] sRGB. +Convert one component from [0, 1] linear sRGB to [0, 1] sRGB. @item double libclut_model_standard_to_linear1(double c) -Convert one component from [0, 1] sRGB to [0, 1] linear RGB. +Convert one component from [0, 1] sRGB to [0, 1] linear sRGB. @end table @command{libclut} has ten functions that are intended for the @@ -33,7 +36,7 @@ type @code{double}, and they do not have a return value. @table @code @item libclut_model_linear_to_standard(*r. *g, *b) -Convert [0, 1] linear RGB to [0, 1] sRGB. +Convert [0, 1] linear sRGB to [0, 1] sRGB. The macro variant requires linking with @option{-lm}, if the @code{libclut_model_linear_to_standard1} is defined, @@ -54,7 +57,7 @@ for the blue component. @item libclut_model_standard_to_linear(*r, *g, *b) -Convert [0, 1] sRGB to [0, 1] linear RGB. +Convert [0, 1] sRGB to [0, 1] linear sRGB. The macro variant requires linking with @option{-lm}, if the @code{libclut_model_standard_to_linear1} is defined, @@ -113,7 +116,7 @@ Output parameter for the y parameter. @item libclut_model_ciexyz_to_linear(X, Y, Z, *r, *g, *b) -Convert CIE XYZ to [0, 1] linear RGB. +Convert CIE XYZ to [0, 1] linear sRGB. Parameters: @table @code @@ -133,7 +136,7 @@ Output parameter for the blue component. @item libclut_model_linear_to_ciexyz(r, g, b, *X, *Y, *Z) -Convert [0, 1] linear RGB to CIE XYZ. +Convert [0, 1] linear sRGB to CIE XYZ. Parameters: @table @code @@ -153,13 +156,13 @@ Output parameter for the Z parameter. @item libclut_model_srgb_to_ciexyy(r, g, b, *x, *y, *Y) -Convert [0, 1] linear RGB to CIE xyY. +Convert [0, 1] linear sRGB to CIE xyY. The macro variant requires linking with @option{-lclut} if any of @code{libclut_model_ciexyz_to_ciexyy}, @code{libclut_model_linear_to_ciexyz}, and @code{libclut_model_standard_to_linear} are undefined. -The macro variant requires linking with @code{-lm} if +The macro variant requires linking with @option{-lm} if neither @code{libclut_model_standard_to_linear} nor @code{libclut_model_standard_to_linear1} are undefined. @@ -248,6 +251,426 @@ Output parameter for the Y parameter. @item Z Output parameter for the Z parameter. @end table + + +@item libclut_model_ciexyz_to_cieluv(X, Y, Z, Xn, Yn, Zn, *L, *u, *v) +Convert from CIE XYZ to CIE 1976 (L*, u*, v*). + +The macro variant requires linking with @option{-lm}. + +Parameters: +@table @code +@item L +The X component. +@item a +The Y component. +@item b +The Z component. +@item Xn +The X component of the specified white object (white point). +@item Yn +The Y component of the specified white object (white point). +@item Zn +The Z component of the specified white object (white point). +@item X +Output parameter for the L* parameter. +@item Y +Output parameter for the u* parameter. +@item Z +Output parameter for the v* parameter. +@end table + + +@item libclut_model_cieluv_to_ciexyz(L, u, v, Xn, Yn, Zn, *X, *Y, *Z) +Convert from CIE 1976 (L*, u*, v*) to CIE XYZ. + +Parameters: +@table @code +@item L +The L* component. +@item a +The u* component. +@item b +The v* component. +@item Xn +The X component of the specified white object (white point). +@item Yn +The Y component of the specified white object (white point). +@item Zn +The Z component of the specified white object (white point). +@item X +Output parameter for the X parameter. +@item Y +Output parameter for the Y parameter. +@item Z +Output parameter for the Z parameter. +@end table + + +@item libclut_model_cielch_to_cieluv(C, h, *u, *v) +Convert from CIE LCh@sub{uv} to CIE 1976 (L*, u*, v*). + +The L* component remains unchanged. + +The macro variant requires linking with @option{-lm}. + +Parameters: +@table @code +@item C +The C*@sub{uv} component. +@item h +The h@sub{uv} component. +@item u +Output parameter for the u* parameter. +@item v +Output parameter for the v* parameter. +@end table + + +@item libclut_model_cieluv_to_cielch(u, v, *C, *h) +Convert from CIE 1976 (L*, u*, v*) to CIE LCh@sub{uv}. + +The L* component remains unchanged. + +The macro variant requires linking with @option{-lm}. + +Parameters: +@table @code +@item a +The u* component. +@item b +The v* component. +@item C +Output parameter for the C*@sub{uv} parameter. +@item h +Output parameter for the h@sub{uv} parameter. +@end table + + +@item libclut_model_srgb_to_yiq(r, g, b, *Y, *I, *Q) +Convert from [0, 1] sRGB to YIQ. + +The macro variant requires linking with @option{-lm}, +or if @option{-lclut} if the macro +@code{libclut_model_standard_to_linear1} has been +undefined. + +Parameters: +@table @code +@item r +The red component. +@item g +The green component. +@item b +The blue component. +@item Y +Output parameter for the Y parameter. +@item I +Output parameter for the I parameter. +@item Q +Output parameter for the Q parameter. +@end table + + +@item libclut_model_yiq_to_srgb(Y, I, Q, *r, *g, *b) +Convert from YIQ to [0, 1] sRGB. + +The macro variant requires linking with @option{-lm}, +or if @option{-lclut} if the macro +@code{libclut_model_linear_to_standard1} has been +undefined. + +Parameters: +@table @code +@item Y +The Y component. +@item I +The I component. +@item Q +The Q component. +@item r +Output parameter for the red parameter. +@item g +Output parameter for the green parameter. +@item b +Output parameter for the blue parameter. +@end table + + +@item libclut_model_srgb_to_ydbdr(r, g, b, *Y, *Db, *Dr) +Convert from [0, 1] sRGB to YD@sub{b}D@sub{r}. + +The macro variant requires linking with @option{-lm}, +or if @option{-lclut} if the macro +@code{libclut_model_standard_to_linear1} has been +undefined. + +Parameters: +@table @code +@item r +The red component. +@item g +The green component. +@item b +The blue component. +@item Y +Output parameter for the Y parameter. +@item Db +Output parameter for the D@sub{b} parameter. +@item Dr +Output parameter for the D@sub{r} parameter. +@end table + + +@item libclut_model_ydbdr_to_srgb(Y, Db, Dr, *r, *g, *b) +Convert from YD@sub{b}D@sub{r} to [0, 1] sRGB. + +The macro variant requires linking with @option{-lm}, +or if @option{-lclut} if the macro +@code{libclut_model_linear_to_standard1} has been +undefined. + +Parameters: +@table @code +@item Y +The Y component. +@item Db +The D@sub{b} component. +@item Dr +The D@sub{r} component. +@item r +Output parameter for the red parameter. +@item g +Output parameter for the green parameter. +@item b +Output parameter for the blue parameter. +@end table + + +@item libclut_model_yuv_to_ydbdr(U, V, *Db, *Dr) +Convert from YUV to YD@sub{b}D@sub{r}. + +The Y component remains unchanged. + +Parameters: +@table @code +@item Y +The U component. +@item V +The V component. +@item Db +Output parameter for the D@sub{b} parameter. +@item Dr +Output parameter for the D@sub{r} parameter. +@end table + + +@item libclut_model_ydbdr_to_yuv(Db, Dr, *U, *V) +Convert from YD@sub{b}D@sub{r} to YUV. + +The Y component remains unchanged. + +Parameters: +@table @code +@item Db +The D@sub{b} component. +@item Dr +The D@sub{r} component. +@item U +Output parameter for the U parameter. +@item V +Output parameter for the V parameter. +@end table + + +@item libclut_model_srgb_to_ypbpr(r, g, b, *Y, *Pb, *Pr) +Convert from [0, 1] sRGB to YP@sub{b}P@sub{r}. + +The macro variant requires linking with @option{-lm}, +or if @option{-lclut} if the macro +@code{libclut_model_standard_to_linear1} has been +undefined. + +Parameters: +@table @code +@item r +The red component. +@item g +The green component. +@item b +The blue component. +@item Y +Output parameter for the Y parameter. +@item Pb +Output parameter for the P@sub{b} parameter. +@item Pr +Output parameter for the P@sub{r} parameter. +@end table + + +@item libclut_model_ypbpr_to_srgb(Y, Pb, Pr, *r, *g, *b) +Convert from YP@sub{b}P@sub{r} to [0, 1] sRGB. + +The macro variant requires linking with @option{-lm}, +or if @option{-lclut} if the macro +@code{libclut_model_linear_to_standard1} has been +undefined. + +Parameters: +@table @code +@item Y +The Y component. +@item Pb +The P@sub{b} component. +@item Pr +The P@sub{r} component. +@item r +Output parameter for the red parameter. +@item g +Output parameter for the green parameter. +@item b +Output parameter for the blue parameter. +@end table + + +@item libclut_model_srgb_to_ycgco(r, g, b, *Y, *Cg, *Co) +Convert from [0, 1] sRGB to YCgCo. + +The macro variant requires linking with @option{-lm}, +or if @option{-lclut} if the macro +@code{libclut_model_standard_to_linear1} has been +undefined. + +Parameters: +@table @code +@item r +The red component. +@item g +The green component. +@item b +The blue component. +@item Y +Output parameter for the Y parameter. +@item Cg +Output parameter for the Cg parameter. +@item Co +Output parameter for the Co parameter. +@end table + + +@item libclut_model_ycgco_to_srgb(Y, Cg, Co, *r, *g, *b) +Convert from YCgCo to [0, 1] sRGB. + +The macro variant requires linking with @option{-lm}, +or if @option{-lclut} if the macro +@code{libclut_model_linear_to_standard1} has been +undefined. + +Parameters: +@table @code +@item Y +The Y component. +@item Cg +The Cg component. +@item Co +The Co component. +@item r +Output parameter for the red parameter. +@item g +Output parameter for the green parameter. +@item b +Output parameter for the blue parameter. +@end table + + +@item libclut_model_cie_1960_ucs_to_ciexyz(u, v, Y, *x, *y, *z) +Convert from CIE 1960 UCS to CIE XYZ. + +Parameters: +@table @code +@item u +The u component. +@item v +The v component. +@item Y +The Y component. +@item x +Output parameter for the X parameter. +@item y +Output parameter for the Y parameter. +@item z +Output parameter for the Z parameter. +@end table + + +@item libclut_model_ciexyz_to_cie_1960_ucs(x, y, z, *u, *v, *Y) +Convert from CIE XYZ to CIE 1960 UCS. + +Parameters: +@table @code +@item x +The X component. +@item y +The Y component. +@item z +The Z component. +@item u +Output parameter for the u parameter. +@item v +Output parameter for the v parameter. +@item Y +Output parameter for the Y parameter. +@end table + + +@item libclut_model_cie_1960_ucs_to_cieuvw(U, V, W, u0, v0, *x, *y, *z) +Convert from CIE 1960 UCS to CIE U*V*W*. + +Parameters: +@table @code +@item U +The U* component. +@item V +The V* component. +@item W +The W* component. +@item u0 +The u parameter for the white point. +@item v0 +The v parameter for the white point. +@item x +Output parameter for the X parameter. +@item y +Output parameter for the Y parameter. +@item z +Output parameter for the Z parameter. +@end table + + +@item libclut_model_cieuvw_to_cie_1960_ucs(x, y, z, u0, v0, *U, *V, *W) +Convert from CIE U*V*W* to CIE 1960 UCS. + +The macro variant requires linking with @option{-lm}. + +Parameters: +@table @code +@item x +The X component. +@item y +The Y component. +@item z +The Z component. +@item u0 +The u parameter for the white point. +@item v0 +The v parameter for the white point. +@item U* +Output parameter for the u parameter. +@item V* +Output parameter for the v parameter. +@item W* +Output parameter for the Y parameter. +@end table @end table @@ -371,6 +794,18 @@ Ekta Space PS5 @tab @code{LIBCLUT_RGB_COLOUR_SPACE_EKTA_SPACE_PS5_INITIALISER} @item +ITU-R BT.709@footnote{ITU-R Recommendation BT.709} +@tab +2.4 +@tab +@code{LIBCLUT_RGB_COLOUR_SPACE_ITU_R_BT_709_INITIALISER} +@item +Lightroom RGB +@tab +1.0 +@tab +@code{LIBCLUT_RGB_COLOUR_SPACE_LIGHTROOM_RGB_INITIALISER} +@item NTSC RGB @tab 2.2 @@ -455,7 +890,7 @@ Returns 0 on success, and -1 on error. The only possible error is the colour spaces and a conversion matrix cannot be created. This function is not available as a macro, thus, linking with -@code{-lclut} is required. +@option{-lclut} is required. Parameters: @table @code @@ -491,8 +926,8 @@ Convert a single RGB colour into another RGB colour space. The colour space must have same gamma functions as RGB. This macro is also available a function. If the function is -used, linking with @code{-lclut} is required, otherwise, -linking with @code{-lm} is required, or @code{-lclut} if +used, linking with @option{-lclut} is required, otherwise, +linking with @option{-lm} is required, or @option{-lclut} if @code{libclut_model_standard_to_linear1} or @code{libclut_model_linear_to_standard1} is undefined. @@ -521,7 +956,7 @@ The red, green, and blue ramps must be of the same size. None of the parameter may have side-effects. -Requires linking with @code{-lm}, or @code{-lclut} if +Requires linking with @option{-lm}, or @option{-lclut} if @code{libclut_model_standard_to_linear1}, @code{libclut_model_linear_to_standard1}, or @code{libclut_model_convert_rgb} is undefined. @@ -560,11 +995,11 @@ are not of the same size. None of the parameter may have side-effects. -Requires linking with @code{-lm}. If +Requires linking with @option{-lm}. If @code{libclut_model_linear_to_standard1}, @code{libclut_model_standard_to_linear1}, or @code{libclut_model_convert_rgb} has been undefined, -linking with @code{-lclut} is also required. +linking with @option{-lclut} is also required. Parameters: @table @code |