我正在使用java压缩图像。如何将jpeg图像转换为jpeg2000无损压缩图像?
我想压缩jpeg2000中的图像无损。
请建议解决方案。
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。
为什么JPG2000而不是其他无损格式如PNG?并且以哪种格式获得图像?文件,下载,位图...? – Gumbo 2014-09-04 09:33:41
对我来说这是一个需求。 – Sivam 2014-09-04 09:34:35
Jpeg图像或PNG图像。 – Sivam 2014-09-04 09:35:06