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);