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Apache Commons Imaging (previously Sanselan) is a pure-Java image library.
There is a newer version: 1.0.0-alpha5
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.commons.imaging.color;

public final class ColorHsv {

    /**
     * A constant for color black. Color components are:
     *      *     Hue:        0
     *     Saturation: 0
     *     Value:      0
     * 
     */
    public static final ColorHsv BLACK = new ColorHsv(0, 0, 0);

    /**
     * A constant for color white. Color components are:
     *      *     Hue:        0
     *     Saturation: 0
     *     Value:      100
     * 
     */
    public static final ColorHsv WHITE = new ColorHsv(0, 0, 100);

    /**
     * A constant for color red. Color components are:
     *      *     Hue:        0
     *     Saturation: 100
     *     Value:      100
     * 
     */
    public static final ColorHsv RED = new ColorHsv(0, 100, 100);

    /**
     * A constant for color green. Color components are:
     *      *     Hue:        120
     *     Saturation: 100
     *     Value:      100
     * 
     */
    public static final ColorHsv GREEN = new ColorHsv(120, 100, 100);

    /**
     * A constant for color blue. Color components are:
     *      *     Hue:        240
     *     Saturation: 100
     *     Value:      100
     * 
     */
    public static final ColorHsv BLUE = new ColorHsv(240, 100, 100);

    public final double H;
    public final double S;
    public final double V;

    public ColorHsv(final double H, final double S, final double V) {
        this.H = H;
        this.S = S;
        this.V = V;
    }

    @Override
    public String toString() {
        return "{H: " + H + ", S: " + S + ", V: " + V + "}";
    }

    @Override
    public boolean equals(final Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }

        final ColorHsv colorHsv = (ColorHsv) o;
        if (Double.compare(colorHsv.H, H) != 0) {
            return false;
        }
        if (Double.compare(colorHsv.S, S) != 0) {
            return false;
        }
        if (Double.compare(colorHsv.V, V) != 0) {
            return false;
        }

        return true;
    }

    @Override
    public int hashCode() {
        int result;
        long temp;
        temp = Double.doubleToLongBits(H);
        result = (int) (temp ^ (temp >>> 32));
        temp = Double.doubleToLongBits(S);
        result = 31 * result + (int) (temp ^ (temp >>> 32));
        temp = Double.doubleToLongBits(V);
        result = 31 * result + (int) (temp ^ (temp >>> 32));
        return result;
    }
}