Java how to set jpg quality

Question

Just wanting to get some code edited so that the output jpg quality isn\'t the default low quality setting that

try
        {
            ImageIO.write(var6         


        

Answer 1

I came across a similar problem and the answer was not very clear to me, since at the time i did not have a knowledge on ImageIO, so to the people like me that came across this post i made a example.

try {
            
            //  Image to be altered 
            BufferedImage imagem = ImageIO.read(new File("c://nota.jpg"));
            
            //  The output image
            File outPutImage = new File("c://nota2.jpg");
            
            //  Encapsulate the outPut image
            ImageOutputStream  ios =  ImageIO.createImageOutputStream(outPutImage);
            
            //  List of ImageWritre's for jpeg format 
            Iterator iter = ImageIO.getImageWritersByFormatName("jpeg");
            
            //  Capture the first ImageWriter
            ImageWriter writer = iter.next();
            
            //  define the o outPut file to the write
            writer.setOutput(ios);

            //  Here you define the changes you wanna make to the image
            ImageWriteParam iwParam = writer.getDefaultWriteParam();
            iwParam.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
            iwParam.setCompressionQuality(.90f);

            //  Compression and saving to file the altered image
            writer.write(null, new IIOImage(imagem, null, null), iwParam);
            
            writer.dispose();               
        } catch (IOException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }

If you know of a easier way or you found out something wrong in my comments or code, please let me know in the comments so i can alter.