java - 如何将jpeg图片转为jpeg2000无损压缩图片？

Question

我正在使用 java 压缩图像。

我想把图片压缩成jpeg2000无损格式

请提出解决方案。

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();  
}  

我正在尝试上面的代码。

Answer 1

查看 this JPEG2000 Java 编码器/解码器项目。 (你可以找到源代码 here )