图片 CMYK转RGB 代码，cmyk转rgb代码,//大部分情况都转换没问

图片 CMYK转RGB 代码，cmyk转rgb代码,//大部分情况都转换没问

//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;        }    }//该片段来自于http://byrx.net