일반적으로 이미지 타입이 RGB가 아닌 CMYK인 경우 


ImageIO.read() 를 이용하여 읽을 경우  Unsupported Image Type 가 발생한다.


일반적으로 CMYK타입 이미지는  ImageIO 로 read 하기 불가능하다




ImageIO.read(file); 를 이용해서 Exception이 발생할 경우 컨버터를 이용하여 처리하는 방식을 이용하여 오류를 줄일 수 있다. 



converter_Lib.zip



converter_Lib.zip의 icc 파일은 Cmyk2RgbConverter와 동일한 경로에 위치하면 된다. 



< Cmyk2RgbConverter.java >


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public class Cmyk2RgbConverter {
 
    public static final int TYPE_RGB = 1;
    public static final int TYPE_CMYK = 2;
    public static final int TYPE_YCCK = 3;
 
    private static int colorTp = TYPE_RGB;
    private static boolean markerFlag = false;
 
 
 
    public static BufferedImage readImage(File file) throws IOException, ImageReadException {
        colorTp = TYPE_RGB;
        markerFlag = false;
 
        ImageInputStream stream = ImageIO.createImageInputStream(file);
        Iterator < itor_imgReader > iter = ImageIO.getitor_imgReaders(stream);
        while (iter.hasNext()) {
            itor_imgReader reader = iter.next();
            reader.setInput(stream);
 
            BufferedImage image;
 
            ICC_pf pf = null;
            try {
                image = reader.read(0);
                
                reader.reset();
            } catch (IIOException e) {
                colorTp = TYPE_CMYK;
                checkMarker(file);
                pf = Sanselan.getICCpf(file);
                Writablewr wr = (Writablewr) reader.readwr(0, null);
 
                
                reader.reset();
 
                if (colorTp == TYPE_YCCK) {
                    convertYcck2Cmyk(wr);
                }
 
                if (markerFlag) {
                    convInvColors(wr);
                }
                image = convertCmykToRgb(wr, pf);
                image.flush();
            } finally {
                stream.close(); 
            }
 
            return image;
        }
 
        return null;
    }
 
    public static void checkMarker(File file) throws IOException, ImageReadException {
        JpegImageParser parser = new JpegImageParser();
        ByteSource byteSource = new ByteSourceFile(file);
        @SuppressWarnings("rawtypes")
        ArrayList segments = parser.readSegments(byteSource, new int[] {
            0xffee
        }, true);
        if (segments != null && segments.size() >= 1) {
            UnknownSegment app14Segment = (UnknownSegment) segments.get(0);
            byte[] data = app14Segment.bytes;
            if (data.length >= 12 && data[0] == 'A' && data[1] == 'd' && data[2] == 'o' && data[3] == 'b' && data[4] == 'e') {
                markerFlag = true;
                int transform = app14Segment.bytes[11] & 0xff;
                if (transform == 2)
                    colorTp = TYPE_YCCK;
            }
        }
    }
 
    public static void convertYcck2Cmyk(Writablewr wr) {
        int height = wr.getHeight();
        int width = wr.getWidth();
        int stride = width * 4;
        int[] rowData = new int[stride];
        for (int h = 0; h < height; h++) {
            wr.getPixels(0, h, width, 1, rowData);
 
            for (int x = 0; x < stride; x += 4) {
                int y = rowData[x];
                int cb = rowData[x + 1];
                int cr = rowData[x + 2];
 
                int c = (int)(y + 1.402 * cr - 178.956);
                int m = (int)(y - 0.34414 * cb - 0.71414 * cr + 135.95984);
                y = (int)(y + 1.772 * cb - 226.316);
 
                if (c < 0)
                    c = 0;
                else if (c > 255)
                    c = 255;
                if (m < 0)
                    m = 0;
                else if (m > 255)
                    m = 255;
                if (y < 0)
                    y = 0;
                else if (y > 255)
                    y = 255;
 
                rowData[x] = 255 - c;
                rowData[x + 1] = 255 - m;
                rowData[x + 2] = 255 - y;
            }
 
            wr.setPixels(0, h, width, 1, rowData);
        }
    }
 
    public static void convInvColors(Writablewr wr) {
        int height = wr.getHeight();
        int width = wr.getWidth();
        int stride = width * 4;
        int[] rowData = new int[stride];
        for (int h = 0; h < height; h++) {
            wr.getPixels(0, h, width, 1, rowData);
            for (int x = 0; x < stride; x++)
                rowData[x] = 255 - rowData[x];
            wr.setPixels(0, h, width, 1, rowData);
        }
    }
 
    public static BufferedImage convertCmykToRgb(wr cmykwr, ICC_pf cmykpf) throws IOException {
 
        if (cmykpf == null) {
            cmykpf = ICC_pf.getInstance(CMYKConverter.class.getResourceAsStream("ISOcoated_v2_300_eci.icc"));
        }
 
        ICC_ColorSpace cmykCS = new ICC_ColorSpace(cmykpf);
        BufferedImage rgbImage = new BufferedImage(cmykwr.getWidth(), cmykwr.getHeight(), BufferedImage.TYPE_INT_RGB);
        Writablewr rgbwr = rgbImage.getwr();
        ColorSpace rgbCS = rgbImage.getColorModel().getColorSpace();
        ColorConvertOp cmykToRgb = new ColorConvertOp(cmykCS, rgbCS, null);
        cmykToRgb.filter(cmykwr, rgbwr);
        return rgbImage;
    }
 
    public static void intToBigEndian(int value, byte[] array, int index) {
        array[index] = (byte)(value >> 24);
        array[index + 1] = (byte)(value >> 16);
        array[index + 2] = (byte)(value >> 8);
        array[index + 3] = (byte)(value);
    }
 
}
 
cs


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