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/*
* 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.formats.tiff.photometricinterpreters;
import java.io.IOException;
import org.apache.commons.imaging.ImageReadException;
import org.apache.commons.imaging.common.ImageBuilder;
public class PhotometricInterpreterYCbCr extends PhotometricInterpreter {
public PhotometricInterpreterYCbCr(final int samplesPerPixel,
final int[] bitsPerSample, final int predictor,
final int width, final int height) {
super(samplesPerPixel, bitsPerSample, predictor, width, height);
}
public static int limit(final int value, final int min, final int max) {
return Math.min(max, Math.max(min, value));
}
/**
* This method converts a YUV (aka YCbCr) colorspace to a RGB colorspace.
* This is handy when trying to reconstruct an image in Java from YCbCr
* transmitted data. This routine expects the data to fall in the standard
* PC 0..255 range per pixel, with the array dimensions corresponding to the
* imageWidth and imageHeight. These variables are either set manually in
* the case of a null constructor, or they are automatically calculated from
* the image parameter constructor.
*
* @param Y
* The Y component set.
* @param Cb
* The Cb component set.
* @param Cr
* The Cr component set.
* @return R The R component.
*/
public static int convertYCbCrtoRGB(final int Y, final int Cb, final int Cr) {
final double r1 = (((1.164 * (Y - 16.0))) + (1.596 * (Cr - 128.0)));
final double g1 = (((1.164 * (Y - 16.0))) - (0.813 * (Cr - 128.0)) - (0.392 * (Cb - 128.0)));
final double b1 = (((1.164 * (Y - 16.0))) + (2.017 * (Cb - 128.0)));
final int r = limit((int) r1, 0, 255);
final int g = limit((int) g1, 0, 255);
final int b = limit((int) b1, 0, 255);
final int alpha = 0xff;
final int rgb = (alpha << 24) | (r << 16) | (g << 8) | (b << 0);
return rgb;
}
@Override
public void interpretPixel(final ImageBuilder imageBuilder, final int[] samples, final int x,
final int y) throws ImageReadException, IOException {
final int Y = samples[0];
final int Cb = samples[1];
final int Cr = samples[2];
final double R = Y + 1.402 * (Cr - 128.0);
final double G = Y - 0.34414 * (Cb - 128.0) - 0.71414 * (Cr - 128.0);
final double B = Y + 1.772 * (Cb - 128.0);
final int red = limit((int) R, 0, 255);
final int green = limit((int) G, 0, 255);
final int blue = limit((int) B, 0, 255);
final int alpha = 0xff;
final int rgb = (alpha << 24) | (red << 16) | (green << 8) | (blue << 0);
imageBuilder.setRGB(x, y, rgb);
}
}