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Bug 755270 - Decompose/Compose LAB: scaling code produces odd L, a, and b values 

Decompose/compose to/from LCH: remove unconditional CLAMP (only clamp
if the component really needs clamping), change LAB AB range.
This commit is contained in:
Elle Stone 2015-09-21 14:40:04 -04:00 committed by Michael Natterer
parent 127b3de54a
commit f78dec232a
2 changed files with 47 additions and 13 deletions
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15
plug-ins/common/compose.c
View File

@ -173,8 +173,12 @@ static void type_combo_callback (GimpIntComboBox *combo,
#define CPN_CMY_Y {"yellow", N_("_Yellow:"), NULL, 0.0, 1.0, TRUE}
#define CPN_LAB_L {"CIE L", N_("_L:"), NULL, 0.0, 100.0, TRUE}
#define CPN_LAB_A {"CIE a", N_("_A:"), NULL, -128.0, 127.0, TRUE}
#define CPN_LAB_B {"CIE b", N_("_B:"), NULL, -128.0, 127.0, TRUE}
#define CPN_LAB_A {"CIE a", N_("_A:"), NULL, -127.5, 127.5, TRUE}
#define CPN_LAB_B {"CIE b", N_("_B:"), NULL, -127.5, 127.5, TRUE}
#define CPN_LCH_L {"CIE L", N_("_L"), NULL, 0.0, 100.0, TRUE}
#define CPN_LCH_C {"CIE C(ab)", N_("_C"), NULL, 0.0, 200.0, TRUE}
#define CPN_LCH_H {"CIE H(ab)", N_("_H"), NULL, 0.0, 360.0, TRUE}
#define CPN_YCBCR_Y {"Y'", N_("_Luma y470:"), NULL, 0.0, 1.0, TRUE}
#define CPN_YCBCR_CB {"Cb", N_("_Blueness cb470:"), NULL, -0.5, 0.5, TRUE}
@ -238,6 +242,13 @@ static COMPOSE_DSC compose_dsc[] =
CPN_LAB_B },
"lab-compose" },
{ "CIE LCH(ab)",
N_("LCH"), 3,
{ CPN_LCH_L,
CPN_LCH_C,
CPN_LCH_H },
"lch-compose" },
{ "Y'CbCr",
N_("YCbCr_ITU_R470"), 3,
{ CPN_YCBCR_Y,

45
plug-ins/common/decompose.c
View File

@ -121,7 +121,8 @@ static void transfer_registration_color (GeglBuffer *src,
gint count);
static void cpn_affine_transform_clamp (GeglBuffer *buffer,
gdouble min,
gdouble max);
gdouble max,
gboolean clamp);
static void copy_n_components (GeglBuffer *src,
GeglBuffer **dst,
EXTRACT ext);
@ -159,8 +160,12 @@ static gchar * generate_filename (guint32 image_ID,
#define CPN_CMY_Y {"yellow", N_("yellow"), 0.0, 1.0, TRUE}
#define CPN_LAB_L {"CIE L", N_("L"), 0.0, 100.0, TRUE}
#define CPN_LAB_A {"CIE a", N_("A"), -128.0, 127.0, TRUE}
#define CPN_LAB_B {"CIE b", N_("B"), -128.0, 127.0, TRUE}
#define CPN_LAB_A {"CIE a", N_("A"), -127.5, 127.5, TRUE}
#define CPN_LAB_B {"CIE b", N_("B"), -127.5, 127.5, TRUE}
#define CPN_LCH_L {"CIE L", N_("L"), 0.0, 100.0, TRUE}
#define CPN_LCH_C {"CIE C(ab)", N_("C"), 0.0, 200.0, TRUE}
#define CPN_LCH_H {"CIE H(ab)", N_("H"), 0.0, 360.0, TRUE}
#define CPN_YCBCR_Y {"Y'", N_("luma-y470"), 0.0, 1.0, TRUE}
#define CPN_YCBCR_CB {"Cb", N_("blueness-cb470"), -0.5, 0.5, TRUE}
@ -202,6 +207,8 @@ static const EXTRACT extract[] =
{ N_("LAB"), "CIE Lab", TRUE, 3, FALSE, {CPN_LAB_L, CPN_LAB_A, CPN_LAB_B} },
{ N_("LCH"), "CIE LCH(ab)", TRUE, 3, FALSE, {CPN_LCH_L, CPN_LCH_C, CPN_LCH_H} },
{ N_("YCbCr_ITU_R470"), "Y'CbCr", TRUE, 3, FALSE, { CPN_YCBCR_Y, CPN_YCBCR_CB, CPN_YCBCR_CR} },
{ N_("YCbCr_ITU_R470_256"), "Y'CbCr", TRUE, 3, TRUE, { CPN_YCBCR_Y, CPN_YCBCR_CB, CPN_YCBCR_CR} },
@ -672,12 +679,12 @@ transfer_registration_color (GeglBuffer *src,
static void
cpn_affine_transform_clamp (GeglBuffer *buffer,
gdouble min,
gdouble max)
gdouble max,
gboolean clamp)
{
GeglBufferIterator *gi;
gdouble scale = 1.0 / (max - min);
gdouble offset = - min;
gdouble scale = 1.0 / (max - min);
gdouble offset = - min;
/* We want to scale values linearly, regardless of the format of the buffer */
gegl_buffer_set_format (buffer, babl_format ("Y double"));
@ -692,9 +699,19 @@ cpn_affine_transform_clamp (GeglBuffer *buffer,
data = (double*) gi->data[0];
for (k = 0; k < gi->length; k++)
if (clamp)
{
data[k] = CLAMP ((data[k] + offset) * scale, 0.0, 1.0);
for (k = 0; k < gi->length; k++)
{
data[k] = CLAMP ((data[k] + offset) * scale, 0.0, 1.0);
}
}
else
{
for (k = 0; k < gi->length; k++)
{
data[k] = (data[k] + offset) * scale;
}
}
}
}
@ -747,8 +764,14 @@ copy_one_component (GeglBuffer *src,
gegl_buffer_set_format (temp, component_format);
gegl_buffer_copy (src, NULL, GEGL_ABYSS_NONE, temp, NULL);
if (component.range_min != 0.0 || component.range_max != 1.0 || clamp)
cpn_affine_transform_clamp (temp, component.range_min, component.range_max);
if (component.range_min != 0.0 ||
component.range_max != 1.0 ||
clamp)
{
cpn_affine_transform_clamp (temp,
component.range_min, component.range_max,
clamp);
}
/* This is our new "Y(') double" component buffer */
gegl_buffer_set_format (temp, NULL);