如何实现jpeg无损?

如何在Java中实现jpeg-lossess?

ImageWriter writer = (ImageWriter) ImageIO.getImageWritersByFormatName("JPEG-LS").next();

ImageWriteParam param = writer.getDefaultWriteParam();

param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);

param.setCompressionType("JPEG-LS");

writer.setOutput(ImageIO.createImageOutputStream(new File("C:\\Users\\RileyRen\\Desktop\\123.jpg")));

writer.write(null, new IIOImage(subBufferedImage, null, null), param);

会抛出异常:

Exception in thread "main" 

java.lang.IllegalArgumentException: Unknown compression type!

at javax.imageio.ImageWriteParam.setCompressionType(ImageWriteParam.java:1041)

at com.demandforce.ImageCrop.main(ImageCrop.java:59)

param.getCompressionTypes()只打印[JPEG]

使用JAI(版本1.1.3):

    PlanarImage input = JAI.create("fileload", "C:\\Users\\RileyRen\\Desktop\\test.jpg");

ParameterBlock pb = new ParameterBlock();

pb.addSource(input);

pb.add(x);

pb.add(y);

pb.add(width);

pb.add(height);

PlanarImage output = JAI.create("crop",pb,null);

JAI.create("filestore",output,"C:\\Users\\RileyRen\\Desktop\\123.jpg","JPEG-LS");

还抛出异常:

Exception in thread "main" 

java.lang.IllegalArgumentException: FileStore The specified format has no associated registered ImageCodec.

at javax.media.jai.JAI.createNS(JAI.java:1087)

at javax.media.jai.JAI.create(JAI.java:973)

at javax.media.jai.JAI.create(JAI.java:1621)

at com.demandforce.ImageCrop.main(ImageCrop.java:103)

你能写个样本吗?

回答:

标准Java没有JPEG-LS的压缩类型。

您可以下载并使用JAI(Java高级映像)API,尽管我相信它包括这样的压缩类型。

可以从这里下载

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