1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.imaging.color;
18
19 /**
20 * Represents a color in the Hunter Lab color space.
21 *
22 * <p>
23 * Contains the constant values for black, white, red, green, and blue.
24 * </p>
25 *
26 * @see <a href="https://en.wikipedia.org/wiki/CIELAB_color_space#Hunter_Lab">https://en.wikipedia.org/wiki/CIELAB_color_space#Hunter_Lab</a>
27 * @since 1.0-alpha1
28 */
29 public final class ColorHunterLab {
30
31 /**
32 * A constant for color black. Color components are:
33 *
34 * <pre>
35 * L: 0
36 * a: 0
37 * b: 0
38 * </pre>
39 */
40 public static final ColorHunterLab BLACK = new ColorHunterLab(0, 0, 0);
41
42 /**
43 * A constant for color white. Color components are:
44 *
45 * <pre>
46 * L: 100.000
47 * a: -5.336
48 * b: 5.433
49 * </pre>
50 */
51 public static final ColorHunterLab WHITE = new ColorHunterLab(100, -5.336, 5.433);
52
53 /**
54 * A constant for color red. Color components are:
55 *
56 * <pre>
57 * L: 46.109
58 * a: 78.962
59 * b: 29.794
60 * </pre>
61 */
62 public static final ColorHunterLab RED = new ColorHunterLab(46.109, 78.962, 29.794);
63
64 /**
65 * A constant for color green. Color components are:
66 *
67 * <pre>
68 * L: 84.569
69 * a: -72.518
70 * b: 50.842
71 * </pre>
72 */
73 public static final ColorHunterLab GREEN = new ColorHunterLab(84.569, -72.518, 50.842);
74
75 /**
76 * A constant for color blue. Color components are:
77 *
78 * <pre>
79 * L: 26.870
80 * a: 72.885
81 * b: -190.923
82 * </pre>
83 */
84 public static final ColorHunterLab BLUE = new ColorHunterLab(26.870, 72.885, -190.923);
85
86 public final double l;
87 public final double a;
88 public final double b;
89
90 public ColorHunterLab(final double l, final double a, final double b) {
91 this.l = l;
92 this.a = a;
93 this.b = b;
94 }
95
96 @Override
97 public boolean equals(final Object o) {
98 if (this == o) {
99 return true;
100 }
101 if (o == null || getClass() != o.getClass()) {
102 return false;
103 }
104
105 final ColorHunterLab that = (ColorHunterLab) o;
106 if (Double.compare(that.l, l) != 0) {
107 return false;
108 }
109 if (Double.compare(that.a, a) != 0) {
110 return false;
111 }
112 if (Double.compare(that.b, b) != 0) {
113 return false;
114 }
115
116 return true;
117 }
118
119 @Override
120 public int hashCode() {
121 int result;
122 long temp;
123 temp = Double.doubleToLongBits(l);
124 result = (int) (temp ^ temp >>> 32);
125 temp = Double.doubleToLongBits(a);
126 result = 31 * result + (int) (temp ^ temp >>> 32);
127 temp = Double.doubleToLongBits(b);
128 return 31 * result + (int) (temp ^ temp >>> 32);
129 }
130
131 @Override
132 public String toString() {
133 return "{L: " + l + ", a: " + a + ", b: " + b + "}";
134 }
135 }