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Apache FOP (Formatting Objects Processor) is the world's first print formatter driven by XSL formatting objects (XSL-FO) and the world's first output independent formatter. It is a Java application that reads a formatting object (FO) tree and renders the resulting pages to a specified output. Output formats currently supported include PDF, PCL, PS, AFP, TIFF, PNG, SVG, XML (area tree representation), Print, AWT and TXT. The primary output target is PDF.
/*
* 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 1039175 2010-11-25 20:59:35Z vhennebert $ */
package org.apache.fop.afp;
import java.awt.Color;
import org.apache.xmlgraphics.java2d.color.ColorConverter;
import org.apache.fop.util.ColorUtil;
/**
* Converts to grayscale using the standard RED=30%, GREEN=59% and BLUE=11%
* weights (see http://en.wikipedia.org/wiki/Grayscale)
*/
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() { }
/**
* static factory
*
* @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);
}
}