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Bug 723213 - colors/levels/auto is broken for high bitdepth images 

Port gimp_levels_config_stretch_channel() to histograms with
variable number of bins. Still behaves differently for different
bit depths tho.
This commit is contained in:
Michael Natterer 2014-01-30 00:19:37 +01:00
parent 5054241ca6
commit fcecafa479
1 changed files with 10 additions and 7 deletions
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17
app/operations/gimplevelsconfig.c
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@ -432,6 +432,8 @@ gimp_levels_config_stretch_channel (GimpLevelsConfig *config,
GimpHistogramChannel channel)
{
gdouble count;
gdouble bias = 0.006;
gint n_bins;
gint i;
g_return_if_fail (GIMP_IS_LEVELS_CONFIG (config));
@ -443,7 +445,8 @@ gimp_levels_config_stretch_channel (GimpLevelsConfig *config,
config->low_output[channel] = 0.0;
config->high_output[channel] = 1.0;
count = gimp_histogram_get_count (histogram, channel, 0, 255);
n_bins = gimp_histogram_n_bins (histogram);
count = gimp_histogram_get_count (histogram, channel, 0, n_bins - 1);
if (count == 0.0)
{
@ -459,7 +462,7 @@ gimp_levels_config_stretch_channel (GimpLevelsConfig *config,
/* Set the low input */
new_count = 0.0;
for (i = 0; i < 255; i++)
for (i = 0; i < (n_bins - 1); i++)
{
new_count += gimp_histogram_get_value (histogram, channel, i);
percentage = new_count / count;
@ -468,9 +471,9 @@ gimp_levels_config_stretch_channel (GimpLevelsConfig *config,
channel,
i + 1)) / count;
if (fabs (percentage - 0.006) < fabs (next_percentage - 0.006))
if (fabs (percentage - bias) < fabs (next_percentage - bias))
{
config->low_input[channel] = (gdouble) (i + 1) / 255.0;
config->low_input[channel] = (gdouble) (i + 1) / (n_bins - 1);
break;
}
}
@ -478,7 +481,7 @@ gimp_levels_config_stretch_channel (GimpLevelsConfig *config,
/* Set the high input */
new_count = 0.0;
for (i = 255; i > 0; i--)
for (i = (n_bins - 1); i > 0; i--)
{
new_count += gimp_histogram_get_value (histogram, channel, i);
percentage = new_count / count;
@ -487,9 +490,9 @@ gimp_levels_config_stretch_channel (GimpLevelsConfig *config,
channel,
i - 1)) / count;
if (fabs (percentage - 0.006) < fabs (next_percentage - 0.006))
if (fabs (percentage - bias) < fabs (next_percentage - bias))
{
config->high_input[channel] = (gdouble) (i - 1) / 255.0;
config->high_input[channel] = (gdouble) (i - 1) / (n_bins - 1);
break;
}
}