颜色转换CMYK转RGB 代码代码,Java代码库,德仔网

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【Java】颜色转换CMYK转RGB 代码
作者:Dezai.CN / 发布于2013/7/1/ 789

	//大部分情况都转换没问题，有极个别的转换不成功。现在想，是不是调用convert.exe 更方便 呵呵

	private static boolean isCMYK(String filename) {
	 boolean result = false;
	 BufferedImage img = null;
	 try {
	 img = ImageIO.read(new File(filename));
	 } catch (IOException e) {
	 System.out.println(e.getMessage() + ": " + filename);
	 try {
	 //把这个文件拷贝出来
	 FileUtils.copyFile(new File(filename), new File("/var/ftp/" + FilenameUtils.getName(filename)));
	 } catch (IOException ex) {
	 java.util.logging.Logger.getLogger(CMYK2RGB.class.getName()).log(Level.SEVERE, null, ex);
	 }
	 }
	 if (img != null) {
	 int colorSpaceType = img.getColorModel().getColorSpace().getType();
	 result = colorSpaceType == ColorSpace.TYPE_CMYK;
	 }

	 return result;
	 }

	 // extract metadata
	 public static BufferedImage readImage(File file) throws IOException {
	 // Get an ImageReader.
	 try {
	 ImageInputStream input = ImageIO.createImageInputStream(file);
	 Iterator readers = ImageIO.getImageReaders(input);
	 if (readers == null || !readers.hasNext()) {
	 return null;
	 }

	 ImageReader reader = (ImageReader) readers.next();
	 reader.setInput(input);
	 String format = reader.getFormatName();

	 if ("JPEG".equalsIgnoreCase(format) || "JPG".equalsIgnoreCase(format)) {
	 try {
	 IIOMetadata metadata = reader.getImageMetadata(0);
	 String metadataFormat = metadata.getNativeMetadataFormatName();
	 IIOMetadataNode iioNode = (IIOMetadataNode) metadata.getAsTree(metadataFormat);

	 NodeList children = iioNode.getElementsByTagName("app14Adobe");
	 if (children.getLength() > 0) {
	 try {
	 iioNode = (IIOMetadataNode) children.item(0);
	 int transform = Integer.parseInt(iioNode.getAttribute("transform"));
	 Raster raster = reader.readRaster(0, reader.getDefaultReadParam());

	 if (input != null) {
	 input.close();
	 }
	 reader.dispose();

	 return createJPEG4(raster, transform);
	 } catch (Exception e) {
	 // TODO Auto-generated catch block
	 log.error(e);
	 }
	 }
	 } catch (Exception e) {
	 // TODO Auto-generated catch block
	 log.error(e);
	// LogWriter.log(file.getPath());
	 }
	 }
	 } catch (NumberFormatException e) {
	 // TODO Auto-generated catch block
	 return null;
	 }
	 return null;
	 }

	 /**
	 *
	 * Java's ImageIO can't process 4-component images
	 *
	 * and Java2D can't apply AffineTransformOp either,
	 *
	 * so convert raster data to RGB.
	 *
	 * Technique due to MArk Stephens.
	 *
	 * Free for any use.
	 *
	 */
	 private static BufferedImage createJPEG4(Raster raster, int xform) {
	 try {
	 int w = raster.getWidth();
	 int h = raster.getHeight();
	 byte[] rgb = new byte[w * h * 3];

	 // if (Adobe_APP14 and transform==2) then YCCK else
	 // CMYK

	 if (xform == 2) { // YCCK --
	 // Adobe

	 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);
	 }

	 } else {
	 // assert xform==0: xform;
	 // CMYK

	 int[] C = raster.getSamples(0, 0, w, h, 0, (int[]) null);
	 int[] M = raster.getSamples(0, 0, w, h, 1, (int[]) null);
	 int[] Y = raster.getSamples(0, 0, w, h, 2, (int[]) null);
	 int[] K = raster.getSamples(0, 0, w, h, 3, (int[]) null);

	 for (int i = 0, imax = C.length, base = 0; i < imax; i++, base += 3) {
	 int c = 255 - C[i];
	 int m = 255 - M[i];
	 int y = 255 - Y[i];
	 int k = 255 - K[i];
	 float kk = k / 255f;

	 rgb[base] = (byte) (255 - Math.min(255f, c * kk + k));
	 rgb[base + 1] = (byte) (255 - Math.min(255f, m * kk + k));
	 rgb[base + 2] = (byte) (255 - Math.min(255f, y * kk + k));
	 }
	 }

	 // from other image types we know InterleavedRaster's can be
	 // manipulated by AffineTransformOp, so create one of those.
	 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);
	 } catch (Exception e) {
	 // TODO Auto-generated catch block
	 log.error(e);
	 return null;
	 }
	 }
试试其它关键字
　CMYK转RGB　
同语言下
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