如何将jpeg图像转换为jpeg2000无损压缩图像？

Question

我正在使用Java压缩一个图像。

File imageFile = new File("C:\\Users\\Public\\Pictures\\Sample Pictures\\Chrysanthemum.jpg");
File compressedImageFile = new File("C:\\Users\\Public\\Pictures\\Sample Pictures\\decompjai.jpg");

InputStream is = new FileInputStream(imageFile);
OutputStream os = new FileOutputStream(compressedImageFile);

BufferedImage image = ImageIO.read(is);

// get all image writers for JPG format
Iterator<ImageWriter> writers = ImageIO.getImageWritersByFormatName("jp2k");

if (!writers.hasNext())
    throw new IllegalStateException("No writers found");

ImageWriter writer = (ImageWriter) writers.next();

J2KImageWriter
J2KImageWriteParam jwp =  (J2KImageWriteParam) writer.getDefaultWriteParam();
// J2KImageWriteParam jwp =  new J2KImageWriteParam();
boolean lossless = true;
jwp.setLossless(lossless);  

// jwp.setFilter(J2KImageWriteParam.FILTER_97);  
if (!lossless) {  
      jwp.setEncodingRate(8.0 / 2);  
}  

// ByteArrayOutputStream baos = new ByteArrayOutputStream();  
try {  
      ImageOutputStream ios = ImageIO.createImageOutputStream(os);  
      writer.setOutput(ios);  
      writer.write(null, new IIOImage(image, null, null), jwp);  
      ios.flush();  
      ios.close();  
} catch (IOException e) {  
      e.printStackTrace();  
}  

Answer 1

我会首先尝试javax.imageIO，因为您的系统可能有一个JPEG2000格式的提供程序。

否则：http://www.deic.uab.cat/~Francesc/显然是针对Java的。