A DESCRIPTION OF THE PROBLEM :
Attempting to load then write out a png with a color type of 2 and a transparency chunk results in the transparency chunk having a size of 0xFFFFFFFF and breaks the image. It seems that upon loading then writing, java attempts to convert the color type from 2 to 6 (true color to true color + alpha). Though, this results in producing a bad png.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
I have added code in the Test Case Code to reproduce. A png image with a color type of 2 and a transparency chunk is also necessary. Create a java class with the following main method to reproduce. I can provide one if needed.


   

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
It is expected that the image written is able to be viewed as normal
ACTUAL -
The image cannot be viewed due to the fact that the transparency chunk has a size of 0xFFFFFFFF, thus corrupting the entire file

---------- BEGIN SOURCE ----------
 public static void main(String[] args) {
        if(args.length != 2) {
            System.out.println("Provide input and output files as parameters");
            return;
        }

        String inputFile = args[0];
        String outputFile = args[1];

        try (
                InputStream input = new FileInputStream(inputFile);
                OutputStream output = new FileOutputStream(outputFile);
        ) {
            ImageInputStream imageInputStream = ImageIO.createImageInputStream(input);
            Iterator<ImageReader> imageReader = ImageIO.getImageReaders(imageInputStream);
            IIOImage image = null;
            if (imageReader.hasNext()) {
                ImageReader reader = imageReader.next();
                reader.setInput(imageInputStream, true);
                IIOMetadata metadata = reader.getImageMetadata(0);
                BufferedImage bufferedImage = reader.read(0);
                Iterator<ImageWriter> imageWriter = ImageIO.getImageWritersByFormatName("png");
                ImageWriter writer = imageWriter.next();

                image = new IIOImage(bufferedImage, null, metadata);
                ImageOutputStream ios = ImageIO.createImageOutputStream(output);
                writer.setOutput(ios);
                writer.write(reader.getStreamMetadata(), image, null);
                ios.flush();
            }
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
---------- END SOURCE ----------