org.apache.xmlgraphics.java2d.color.GrayScaleColorConverter Maven / Gradle / Ivy
/*
* 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.
*/
/* $Id: GrayScaleColorConverter.java 1345683 2012-06-03 14:50:33Z gadams $ */
package org.apache.xmlgraphics.java2d.color;
import java.awt.Color;
/**
* Converts to grayscale using the standard RED=30%, GREEN=59% and BLUE=11%
* weights (see http://en.wikipedia.org/wiki/Grayscale)
*/
public final class GrayScaleColorConverter implements ColorConverter {
private static final int RED_WEIGHT = 77;
private static final int GREEN_WEIGTH = 150;
private static final int BLUE_WEIGHT = 28;
private static final GrayScaleColorConverter SINGLETON = new GrayScaleColorConverter();
private GrayScaleColorConverter() {
}
/**
* Returns a singleton instance.
*
* @return singleton instance of GrayScaleColorConverter
*/
public static GrayScaleColorConverter getInstance() {
return SINGLETON;
}
/**
* The color is converted to CMYK with just the K component.
* {@inheritDoc}
*/
public Color convert(Color color) {
float kValue = (RED_WEIGHT * color.getRed()
+ GREEN_WEIGTH * color.getGreen()
+ BLUE_WEIGHT * color.getBlue()) / 255.0f / 255.0f;
return ColorUtil.toCMYKGrayColor(kValue);
}
}