Uncompress a TIFF file without going through BufferedImage
- by Gert
I am receiving large size CCITT Group 4 compressed TIFF files that need to be written elsewhere as uncompressed TIFF files. I am using the jai_imageio TIFF reader and writer to do that and it works well as long as the product _width * height_ of the image fits in an integer.
Here is the code I am using:
TIFFImageReaderSpi readerSpi= new TIFFImageReaderSpi();
ImageReader imageReader = readerSpi.createReaderInstance();
byte[] data = blobManager.getObjectForIdAndVersion(id, version);
ImageInputStream imageInputStream = ImageIO.createImageInputStream(data);
imageReader.setInput(imageInputStream);
TIFFImageWriterSpi writerSpi = new TIFFImageWriterSpi();
ImageWriter imageWriter = writerSpi.createWriterInstance();
ImageWriteParam imageWriteParam = imageWriter.getDefaultWriteParam();
imageWriteParam.setCompressionMode(ImageWriteParam.MODE_DISABLED);
//bufferFile is created in the constructor
ImageOutputStream imageOutputStream = ImageIO.createImageOutputStream(bufferFile);
imageWriter.setOutput(imageOutputStream);
//Now read the bitmap
BufferedImage bufferedImage = imageReader.read(0);
IIOImage iIOImage = new IIOImage(bufferedImage, null, null);
//and write it
imageWriter.write(null, iIOImage, imageWriteParam);
Unfortunately, the files that I receive are often very large and the BufferedImage cannot be created.
I have been trying to find a way to stream from the ImageReader directly to the ImageWriter but I cannot find out how to do that.
Anybody with a suggestion?
