There is an open rfe ( 4799903) about this problem.
You should have a look at the comment by phelps at the bottom of the page.
Here after is a piece of code I use to load CMYK jpeg images.
Emmanuel D.
------------------------------------------------------------------------------
// extract metadata
public static BufferedImage readImage(File file) throws IOException {
// Get an ImageReader.
ImageInputStream input = ImageIO.createImageInputStream(file);
Iterator readers = ImageIO.getImageReaders(input);
if(readers == null || !readers.hasNext()) {
throw new RuntimeException("No ImageReaders found");
}
ImageReader reader = (ImageReader) readers.next();
reader.setInput(input);
String format = reader.getFormatName() ;
if ( "JPEG".equalsIgnoreCase(format) ||
"JPG".equalsIgnoreCase(format) ) {
IIOMetadata metadata = reader.getImageMetadata(0);
String metadataFormat = metadata.getNativeMetadataFormatName() ;
IIOMetadataNode iioNode = (IIOMetadataNode)
metadata.getAsTree(metadataFormat);
NodeList children = iioNode.getElementsByTagName("app14Adobe") ;
if ( children.getLength() > 0 ) {
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) ;
}
}
throw new RuntimeException("No ImageReaders found");
}
/**
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) {
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);
}
Chris Campbell wrote:
Ahh, I forgot that our JPEGImageReader does not currently support
reading CMYK JPEG images. See the following for more details:
http://java.sun.com/j2se/1.5.0/docs/api/javax/imageio/metadata/doc-
files/jpeg_metadata.html#color
I'm not sure if we can ever loosen this restriction, but you might want
to file an RFE against java/imageio, and we can investigate whether it
would be possible to add support for CMYK images.
Note that there is a separate interest list devoted to Image I/O:
[EMAIL PROTECTED]
Thanks,
Chris
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