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-rw-r--r--src/libcolour.c76
1 files changed, 50 insertions, 26 deletions
diff --git a/src/libcolour.c b/src/libcolour.c
index dd170af..d2e056b 100644
--- a/src/libcolour.c
+++ b/src/libcolour.c
@@ -38,7 +38,7 @@ static void to_ciexyy(const libcolour_colour_t* restrict from, libcolour_ciexyy_
static void to_ciexyz(const libcolour_colour_t* restrict from, libcolour_ciexyz_t* restrict to);
static void to_cielab(const libcolour_colour_t* restrict from, libcolour_cielab_t* restrict to);
static void to_cieluv(const libcolour_colour_t* restrict from, libcolour_cieluv_t* restrict to);
-static void to_cielch(const libcolour_colour_t* restrict from, libcolour_cielch_t* restrict to);
+static void to_cielchuv(const libcolour_colour_t* restrict from, libcolour_cielchuv_t* restrict to);
static void to_yiq(const libcolour_colour_t* restrict from, libcolour_yiq_t* restrict to);
static void to_ydbdr(const libcolour_colour_t* restrict from, libcolour_ydbdr_t* restrict to);
static void to_yuv(const libcolour_colour_t* restrict from, libcolour_yuv_t* restrict to);
@@ -364,7 +364,7 @@ static void cieluv_to_ciexyz(const libcolour_cieluv_t* restrict from, libcolour_
to->Z = Y * (3 / v - 0.75 * u / v - 5);
}
-static void cielch_to_ciexyz(const libcolour_cielch_t* restrict from, libcolour_ciexyz_t* restrict to)
+static void cielchuv_to_ciexyz(const libcolour_cielchuv_t* restrict from, libcolour_ciexyz_t* restrict to)
{
libcolour_cieluv_t tmp;
tmp.model = LIBCOLOUR_CIELUV;
@@ -427,8 +427,8 @@ static void to_ciexyz(const libcolour_colour_t* restrict from, libcolour_ciexyz_
case LIBCOLOUR_CIELUV:
cieluv_to_ciexyz(&from->cieluv, to);
return;
- case LIBCOLOUR_CIELCH:
- cielch_to_ciexyz(&from->cielch, to);
+ case LIBCOLOUR_CIELCHUV:
+ cielchuv_to_ciexyz(&from->cielchuv, to);
return;
case LIBCOLOUR_YUV:
yuv_to_ciexyz(&from->yuv, to);
@@ -504,17 +504,17 @@ static void ciexyz_to_cieluv(const libcolour_ciexyz_t* restrict from, libcolour_
to->v = v * y;
}
-static void cielch_to_cieluv(const libcolour_cielch_t* restrict from, libcolour_cieluv_t* restrict to)
+static void cielchuv_to_cieluv(const libcolour_cielchuv_t* restrict from, libcolour_cieluv_t* restrict to)
{
libcolour_ciexyz_t tmp;
- libcolour_cielch_t tmp2;
+ libcolour_cielchuv_t tmp2;
double L, C, h;
if (to->white.X != from->white.X || to->white.Y != from->white.Y || to->white.Z != from->white.Z) {
tmp.model = LIBCOLOUR_CIEXYZ;
- tmp2.model = LIBCOLOUR_CIELCH;
+ tmp2.model = LIBCOLOUR_CIELCHUV;
tmp2.white = to->white;
to_ciexyz((const libcolour_colour_t*)from, &tmp);
- to_cielch((const libcolour_colour_t*)&tmp, &tmp2);
+ to_cielchuv((const libcolour_colour_t*)&tmp, &tmp2);
L = tmp2.L, C = tmp2.C, h = tmp2.h;
} else {
L = from->L, C = from->C, h = from->h;
@@ -538,8 +538,8 @@ static void to_cieluv(const libcolour_colour_t* restrict from, libcolour_cieluv_
case LIBCOLOUR_CIEXYZ:
ciexyz_to_cieluv(&from->ciexyz, to);
return;
- case LIBCOLOUR_CIELCH:
- cielch_to_cieluv(&from->cielch, to);
+ case LIBCOLOUR_CIELCHUV:
+ cielchuv_to_cieluv(&from->cielchuv, to);
return;
case LIBCOLOUR_CIELUV:
if (to->white.X == from->cieluv.white.X &&
@@ -556,7 +556,7 @@ static void to_cieluv(const libcolour_colour_t* restrict from, libcolour_cieluv_
}
-static void cieluv_to_cielch(const libcolour_cieluv_t* restrict from, libcolour_cielch_t* restrict to)
+static void cieluv_to_cielchuv(const libcolour_cieluv_t* restrict from, libcolour_cielchuv_t* restrict to)
{
libcolour_cieluv_t tmp;
double L, u, v;
@@ -573,31 +573,31 @@ static void cieluv_to_cielch(const libcolour_cieluv_t* restrict from, libcolour_
to->h = atan2(v, u);
}
-static void other_to_cielch(const libcolour_colour_t* restrict from, libcolour_cielch_t* restrict to)
+static void other_to_cielchuv(const libcolour_colour_t* restrict from, libcolour_cielchuv_t* restrict to)
{
libcolour_cieluv_t tmp;
tmp.model = LIBCOLOUR_CIELUV;
tmp.white = to->white;
to_cieluv(from, &tmp);
- cieluv_to_cielch(&tmp, to);
+ cieluv_to_cielchuv(&tmp, to);
}
-static void to_cielch(const libcolour_colour_t* restrict from, libcolour_cielch_t* restrict to)
+static void to_cielchuv(const libcolour_colour_t* restrict from, libcolour_cielchuv_t* restrict to)
{
switch (from->model) {
case LIBCOLOUR_CIELUV:
- cieluv_to_cielch(&from->cieluv, to);
+ cieluv_to_cielchuv(&from->cieluv, to);
return;
- case LIBCOLOUR_CIELCH:
- if (to->white.X == from->cielch.white.X &&
- to->white.Y == from->cielch.white.Y &&
- to->white.Z == from->cielch.white.Z) {
- *to = from->cielch;
+ case LIBCOLOUR_CIELCHUV:
+ if (to->white.X == from->cielchuv.white.X &&
+ to->white.Y == from->cielchuv.white.Y &&
+ to->white.Z == from->cielchuv.white.Z) {
+ *to = from->cielchuv;
return;
}
/* fall through */
default:
- other_to_cielch(from, to);
+ other_to_cielchuv(from, to);
return;
}
}
@@ -828,8 +828,8 @@ int libcolour_convert(const libcolour_colour_t* restrict from, libcolour_colour_
case LIBCOLOUR_CIELUV:
to_cieluv(from, &to->cieluv);
break;
- case LIBCOLOUR_CIELCH:
- to_cielch(from, &to->cielch);
+ case LIBCOLOUR_CIELCHUV:
+ to_cielchuv(from, &to->cielchuv);
break;
case LIBCOLOUR_YIQ:
to_yiq(from, &to->yiq);
@@ -941,8 +941,8 @@ int libcolour_proper(libcolour_colour_t* colour)
case LIBCOLOUR_CIELUV:
colour->cieluv.white.model = LIBCOLOUR_CIEXYZ;
break;
- case LIBCOLOUR_CIELCH:
- colour->cielch.white.model = LIBCOLOUR_CIEXYZ;
+ case LIBCOLOUR_CIELCHUV:
+ colour->cielchuv.white.model = LIBCOLOUR_CIEXYZ;
break;
case LIBCOLOUR_RGB:
colour->rgb.red.model = LIBCOLOUR_CIEXYY;
@@ -1096,11 +1096,26 @@ static int invert_(size_t n, double (*Minvp)[n][n], double (*Mp)[n][n])
}
+static double transfer_function_l_star(double t)
+{
+ t = (t > 216. / 24389.) ? cbrt(t) : t * 841. / 108. + 4. / 29.;
+ return t * 1.16 - 0.16;
+}
+
+static double invtransfer_function_l_star(double t)
+{
+ t = (t + 0.16) / 1.16;
+ return (t > 6. / 29.) ? t * t * t : (t - 4. / 29.) * 108 / 841;
+}
+
+
static void get_transfer_function(libcolour_colour_t* cs)
{
if (cs->model == LIBCOLOUR_RGB) {
switch (cs->rgb.colour_space) {
- case LIBCOLOUR_RGB_COLOUR_SPACE_ECI_RGB_V2: /* TODO L* */
+ case LIBCOLOUR_RGB_COLOUR_SPACE_ECI_RGB_V2:
+ cs->rgb.to_encoded_red = cs->rgb.to_encoded_green = cs->rgb.to_encoded_blue = transfer_function_l_star;
+ cs->rgb.to_decoded_red = cs->rgb.to_decoded_green = cs->rgb.to_decoded_blue = invtransfer_function_l_star;
break;
case LIBCOLOUR_RGB_COLOUR_SPACE_ITU_R_BT_2100_EOTF_PQ:
case LIBCOLOUR_RGB_COLOUR_SPACE_ITU_R_BT_2100_OOTF_PQ:
@@ -1239,6 +1254,15 @@ int libcolour_get_rgb_colour_space(libcolour_rgb_t* cs, libcolour_rgb_colour_spa
cs->gamma = 2.2;
break;
+ case LIBCOLOUR_RGB_COLOUR_SPACE_ECI_RGB:
+ cs->red = XYY(0.6700, 0.3300);
+ cs->green = XYY(0.2100, 0.7100);
+ cs->blue = XYY(0.1400, 0.0800);
+ cs->white = LIBCOLOUR_ILLUMINANT_D50;
+ cs->encoding_type = LIBCOLOUR_ENCODING_TYPE_SIMPLE;
+ cs->gamma = 1.8;
+ break;
+
case LIBCOLOUR_RGB_COLOUR_SPACE_ECI_RGB_V2:
cs->red = XYY(0.6700, 0.3300);
cs->green = XYY(0.2100, 0.7100);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-08 22:30:10 +0000