1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
|
#include "hue_saturation.h"
#include <limits>
namespace image
{
template <typename T>
T clamp(T value, T max, T min)
{
if (value > max)
value = max;
else if (value < min)
value = min;
return value;
};
HueSaturation::HueSaturation()
{
overlap = 0.0f;
for (int i = HUE_RANGE_ALL; i <= HUE_RANGE_MAGENTA; i++)
{
HueRange partition = (HueRange)i;
hue[partition] = 0.0;
lightness[partition] = 0.0;
saturation[partition] = 0.0;
}
}
double map_hue(HueSaturation config, HueRange range, double value)
{
value += (config.hue[HUE_RANGE_ALL] + config.hue[range]) / 2.0;
if (value < 0)
return value + 1.0;
else if (value > 1.0)
return value - 1.0;
else
return value;
}
double map_hue_overlap(HueSaturation config, HueRange primary_range, HueRange secondary_range, double value, double primary_intensity, double secondary_intensity)
{
double v = config.hue[primary_range] * primary_intensity +
config.hue[secondary_range] * secondary_intensity;
value += (config.hue[HUE_RANGE_ALL] + v) / 2.0;
if (value < 0)
return value + 1.0;
else if (value > 1.0)
return value - 1.0;
else
return value;
}
double map_saturation(HueSaturation config,
HueRange range,
double value)
{
double v = config.saturation[HUE_RANGE_ALL] + config.saturation[range];
value *= (v + 1.0);
return clamp<double>(value, 1.0, 0.0);
}
double map_lightness(HueSaturation config, HueRange range, double value)
{
double v = (config.lightness[HUE_RANGE_ALL] + config.lightness[range]);
if (v < 0)
return value * (v + 1.0);
else
return value + (v * (1.0 - value));
}
void hue_saturation(Image &image, HueSaturation config)
{
float scale = image.maxval() - 1;
double rgb_r, rgb_g, rgb_b;
double hsl_h, hsl_s, hsl_l;
float overlap = config.overlap / 2.0;
for (size_t pixel = 0; pixel < image.width() * image.height(); pixel++)
{
rgb_r = image.get(image.width() * image.height() * 0 + pixel) / scale;
rgb_g = image.get(image.width() * image.height() * 1 + pixel) / scale;
rgb_b = image.get(image.width() * image.height() * 2 + pixel) / scale;
rgb_to_hsl(rgb_r, rgb_g, rgb_b, hsl_h, hsl_s, hsl_l);
{
double h;
int hue_counter;
int hue = 0;
int secondary_hue = 0;
bool use_secondary_hue = false;
float primary_intensity = 0.0;
float secondary_intensity = 0.0;
h = hsl_h * 6.0;
for (hue_counter = 0; hue_counter < 7; hue_counter++)
{
double hue_threshold = (double)hue_counter + 0.5;
if (h < ((double)hue_threshold + overlap))
{
hue = hue_counter;
if (overlap > 0.0 && h > ((double)hue_threshold - overlap))
{
use_secondary_hue = true;
secondary_hue = hue_counter + 1;
secondary_intensity = (h - (double)hue_threshold + overlap) / (2.0 * overlap);
primary_intensity = 1.0 - secondary_intensity;
}
else
{
use_secondary_hue = false;
}
break;
}
}
if (hue >= 6)
{
hue = 0;
use_secondary_hue = false;
}
if (secondary_hue >= 6)
{
secondary_hue = 0;
}
hue++;
secondary_hue++;
if (use_secondary_hue)
{
hsl_h = map_hue_overlap(config, (HueRange)hue, (HueRange)secondary_hue, hsl_h, primary_intensity, secondary_intensity);
hsl_s = (map_saturation(config, (HueRange)hue, hsl_s) * primary_intensity + map_saturation(config, (HueRange)secondary_hue, hsl_s) * secondary_intensity);
hsl_l = (map_lightness(config, (HueRange)hue, hsl_l) * primary_intensity + map_lightness(config, (HueRange)secondary_hue, hsl_l) * secondary_intensity);
}
else
{
hsl_h = map_hue(config, (HueRange)hue, hsl_h);
hsl_s = map_saturation(config, (HueRange)hue, hsl_s);
hsl_l = map_lightness(config, (HueRange)hue, hsl_l);
}
}
hsl_to_rgb(hsl_h, hsl_s, hsl_l, rgb_r, rgb_g, rgb_b);
image.set(image.width() * image.height() * 0 + pixel, rgb_r * scale);
image.set(image.width() * image.height() * 1 + pixel, rgb_g * scale);
image.set(image.width() * image.height() * 2 + pixel, rgb_b * scale);
}
}
void rgb_to_hsl(double r, double g, double b, double &h, double &s, double &l)
{
double max, min, delta;
max = std::max<double>(r, std::max<double>(g, b));
min = std::min<double>(r, std::min<double>(g, b));
l = (max + min) / 2.0;
if (max == min)
{
s = 0.0;
h = -1.0;
}
else
{
if (l <= 0.5)
s = (max - min) / (max + min);
else
s = (max - min) / (2.0 - max - min);
delta = max - min;
if (delta == 0.0)
delta = 1.0;
if (r == max)
{
h = (g - b) / delta;
}
else if (g == max)
{
h = 2.0 + (b - r) / delta;
}
else
{
h = 4.0 + (r - g) / delta;
}
h /= 6.0;
if (h < 0.0)
h += 1.0;
}
}
double hsl_value(double n1, double n2, double hue)
{
double val;
if (hue > 6.0)
hue -= 6.0;
else if (hue < 0.0)
hue += 6.0;
if (hue < 1.0)
val = n1 + (n2 - n1) * hue;
else if (hue < 3.0)
val = n2;
else if (hue < 4.0)
val = n1 + (n2 - n1) * (4.0 - hue);
else
val = n1;
return val;
}
void hsl_to_rgb(double h, double s, double l, double &r, double &g, double &b)
{
if (s == 0)
{
r = l;
g = l;
b = l;
}
else
{
double m1, m2;
if (l <= 0.5)
m2 = l * (1.0 + s);
else
m2 = l + s - l * s;
m1 = 2.0 * l - m2;
r = hsl_value(m1, m2, h * 6.0 + 2.0);
g = hsl_value(m1, m2, h * 6.0);
b = hsl_value(m1, m2, h * 6.0 - 2.0);
}
}
}
|
