cmyk.java

private BufferedImage readImageWithColorSpacePreservation(byte[] imageData) {
  try (ImageInputStream inputStream = ImageIO.createImageInputStream(new ByteArrayInputStream(imageData))) {
      // Get the reader
      Iterator<ImageReader> readers = ImageIO.getImageReaders(inputStream);

      if (!readers.hasNext()) {
          throw new IllegalArgumentException("No reader found");
      }

      ImageReader reader = readers.next();
      try {
          reader.setInput(inputStream);
          Iterator<ImageTypeSpecifier> types = reader.getImageTypes(0);

          // determine if CMYK decoding is possible
          ImageTypeSpecifier cmykType = null;
          while (types.hasNext()) {
              ImageTypeSpecifier type = types.next();

              int csType = type.getColorModel().getColorSpace().getType();
              if (csType == ColorSpace.TYPE_CMYK) {
                  cmykType = type;
                  break;
              }
          }

          // set reader to preserve CMYK color space if found
          ImageReadParam param = reader.getDefaultReadParam();
          if (cmykType != null) {
              param.setDestinationType(cmykType);
          }

          // Finally read the image, using settings from param
          return reader.read(0, param);
      }
      finally {
          reader.dispose();
      }
  } catch (IOException e) {
      e.printStackTrace();
  }
  return null;
}