Java实现把cmyk格式图片转换为RGB格式图片
2015-09-28 15:40
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package com.pb.util;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
import java.awt.Transparency;
import java.awt.color.ColorSpace;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.ComponentColorModel;
import java.awt.image.DataBuffer;
import java.awt.image.DataBufferByte;
import java.awt.image.Raster;
import java.awt.image.WritableRaster;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Iterator;
import javax.imageio.IIOException;
import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;
/**
* 把cmyk格式图片转换为RGB格式
* @author Administrator
*
*/
public class CMYK {
public void readImage(String filename) throws IOException {
File file = new File(filename);
ImageInputStream input = ImageIO.createImageInputStream(file);
Iterator readers = ImageIO.getImageReaders(input);
if(readers == null || !readers.hasNext()) {
throw new RuntimeException("1 No ImageReaders found");
}
ImageReader reader = (ImageReader) readers.next();
reader.setInput(input);
String format = reader.getFormatName() ;
BufferedImage image;
if ( "JPEG".equalsIgnoreCase(format) ||"JPG".equalsIgnoreCase(format) ) {
try {
// 尝试读取图片 (包括颜色的转换).
image = reader.read(0); //RGB
} catch (IIOException e) {
// 读取Raster (没有颜色的转换).
Raster raster = reader.readRaster(0, null);//CMYK
image = createJPEG4(raster);
}
image.getGraphics().drawImage(image, 0, 0, null);
//String newfilename = filename.substring(0,filename.lastIndexOf("."))+"_rgb"+filename.substring(filename.lastIndexOf("."));
String newfilename = filename;
File newFile = new File(newfilename);
FileOutputStream out = new FileOutputStream(newFile);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
encoder.encode(image);
out.flush();
out.close();
}
}
private static BufferedImage createJPEG4(Raster raster) {
int w = raster.getWidth();
int h = raster.getHeight();
byte[] rgb = new byte[w * h * 3];
//彩色空间转换
float[] Y = raster.getSamples(0, 0, w, h, 0, (float[]) null);
float[] Cb = raster.getSamples(0, 0, w, h, 1, (float[]) null);
float[] Cr = raster.getSamples(0, 0, w, h, 2, (float[]) null);
float[] K = raster.getSamples(0, 0, w, h, 3, (float[]) null);
for (int i = 0, imax = Y.length, base = 0; i < imax; i++, base += 3) {
float k = 220 - K[i], y = 255 - Y[i], cb = 255 - Cb[i],
cr = 255 - Cr[i];
double val = y + 1.402 * (cr - 128) - k;
val = (val - 128) * .65f + 128;
rgb[base] = val < 0.0 ? (byte) 0 : val > 255.0 ? (byte) 0xff
: (byte) (val + 0.5);
val = y - 0.34414 * (cb - 128) - 0.71414 * (cr - 128) - k;
val = (val - 128) * .65f + 128;
rgb[base + 1] = val < 0.0 ? (byte) 0 : val > 255.0 ? (byte) 0xff
: (byte) (val + 0.5);
val = y + 1.772 * (cb - 128) - k;
val = (val - 128) * .65f + 128;
rgb[base + 2] = val < 0.0 ? (byte) 0 : val > 255.0 ? (byte) 0xff
: (byte) (val + 0.5);
}
raster = Raster.createInterleavedRaster(new DataBufferByte(rgb, rgb.length), w, h, w * 3, 3, new int[]{0, 1, 2}, null);
ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_sRGB);
ColorModel cm = new ComponentColorModel(cs, false, true, Transparency.OPAQUE, DataBuffer.TYPE_BYTE);
return new BufferedImage(cm, (WritableRaster) raster, true, null);
}
//测试
public static void main(String[] args) throws IOException {
String filename = "d:/2015.jpg";
CMYK cm = new CMYK();
cm.readImage(filename);
}
}
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
import java.awt.Transparency;
import java.awt.color.ColorSpace;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.ComponentColorModel;
import java.awt.image.DataBuffer;
import java.awt.image.DataBufferByte;
import java.awt.image.Raster;
import java.awt.image.WritableRaster;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Iterator;
import javax.imageio.IIOException;
import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;
/**
* 把cmyk格式图片转换为RGB格式
* @author Administrator
*
*/
public class CMYK {
public void readImage(String filename) throws IOException {
File file = new File(filename);
ImageInputStream input = ImageIO.createImageInputStream(file);
Iterator readers = ImageIO.getImageReaders(input);
if(readers == null || !readers.hasNext()) {
throw new RuntimeException("1 No ImageReaders found");
}
ImageReader reader = (ImageReader) readers.next();
reader.setInput(input);
String format = reader.getFormatName() ;
BufferedImage image;
if ( "JPEG".equalsIgnoreCase(format) ||"JPG".equalsIgnoreCase(format) ) {
try {
// 尝试读取图片 (包括颜色的转换).
image = reader.read(0); //RGB
} catch (IIOException e) {
// 读取Raster (没有颜色的转换).
Raster raster = reader.readRaster(0, null);//CMYK
image = createJPEG4(raster);
}
image.getGraphics().drawImage(image, 0, 0, null);
//String newfilename = filename.substring(0,filename.lastIndexOf("."))+"_rgb"+filename.substring(filename.lastIndexOf("."));
String newfilename = filename;
File newFile = new File(newfilename);
FileOutputStream out = new FileOutputStream(newFile);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
encoder.encode(image);
out.flush();
out.close();
}
}
private static BufferedImage createJPEG4(Raster raster) {
int w = raster.getWidth();
int h = raster.getHeight();
byte[] rgb = new byte[w * h * 3];
//彩色空间转换
float[] Y = raster.getSamples(0, 0, w, h, 0, (float[]) null);
float[] Cb = raster.getSamples(0, 0, w, h, 1, (float[]) null);
float[] Cr = raster.getSamples(0, 0, w, h, 2, (float[]) null);
float[] K = raster.getSamples(0, 0, w, h, 3, (float[]) null);
for (int i = 0, imax = Y.length, base = 0; i < imax; i++, base += 3) {
float k = 220 - K[i], y = 255 - Y[i], cb = 255 - Cb[i],
cr = 255 - Cr[i];
double val = y + 1.402 * (cr - 128) - k;
val = (val - 128) * .65f + 128;
rgb[base] = val < 0.0 ? (byte) 0 : val > 255.0 ? (byte) 0xff
: (byte) (val + 0.5);
val = y - 0.34414 * (cb - 128) - 0.71414 * (cr - 128) - k;
val = (val - 128) * .65f + 128;
rgb[base + 1] = val < 0.0 ? (byte) 0 : val > 255.0 ? (byte) 0xff
: (byte) (val + 0.5);
val = y + 1.772 * (cb - 128) - k;
val = (val - 128) * .65f + 128;
rgb[base + 2] = val < 0.0 ? (byte) 0 : val > 255.0 ? (byte) 0xff
: (byte) (val + 0.5);
}
raster = Raster.createInterleavedRaster(new DataBufferByte(rgb, rgb.length), w, h, w * 3, 3, new int[]{0, 1, 2}, null);
ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_sRGB);
ColorModel cm = new ComponentColorModel(cs, false, true, Transparency.OPAQUE, DataBuffer.TYPE_BYTE);
return new BufferedImage(cm, (WritableRaster) raster, true, null);
}
//测试
public static void main(String[] args) throws IOException {
String filename = "d:/2015.jpg";
CMYK cm = new CMYK();
cm.readImage(filename);
}
}
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