image - Tiff compression using Java ImageIO

Question

I am having issues converting a png to tiff. The conversion goes fine, but the image is huge. I think the issue is that I am not doing the compression correctly? Anyone have any suggestions??

Here is the code sample

public static void test() throws IOException {

    // String fileName = "4958813_1";
    String fileName = "4848970_1";
    String inFileType = ".PNG";
    String outFileType = ".TIFF";

    ImageIO.scanForPlugins();

    File fInputFile = new File("I:/HPF/UU/" + fileName + inFileType);
    InputStream fis = new BufferedInputStream(new FileInputStream(
            fInputFile));
    PNGImageReaderSpi spi = new PNGImageReaderSpi();
    ImageReader reader = spi.createReaderInstance();

    ImageInputStream iis = ImageIO.createImageInputStream(fis);
    reader.setInput(iis, true);
    BufferedImage bi = reader.read(0);

    TIFFImageWriterSpi tiffspi = new TIFFImageWriterSpi();
    ImageWriter writer = tiffspi.createWriterInstance();
    //Iterator<ImageWriter> iter =  ImageIO.getImageWritersByFormatName("TIFF");
    //ImageWriter writer = iter.next();

    ImageWriteParam param = writer.getDefaultWriteParam();
    param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);

    param.setCompressionType("LZW");
    param.setCompressionQuality(0.5f);
    File fOutputFile = new File("I:\HPF\UU" + fileName + outFileType);
    ImageOutputStream ios = ImageIO.createImageOutputStream(fOutputFile);
    writer.setOutput(ios);
    writer.write(bi);

}

Answer 1

Writer.getDefaultWriteParam() only creates an ImageWriteParam object, it doesn't link it back to anything else.

I don't see any mechanism in your code for your modified param object to be subsequently used in the ImageWriter.

I believe that instead of:

writer.write(bi);

you need to use:

writer.write(null, new IIOImage(bi, null, null), param);