setCompressionType 错误

发布于 2024-12-07 12:31:07 字数 647 浏览 1 评论 0原文

有人可以帮助纠正这个代码吗？

我正在使用 JAI 并尝试将 JPG 文件压缩为无损这是我的代码

     `ImageWriter writer= (JPEGImageWriter) ImageIO.getImageWritersByFormatName("jpeg").next();
     javax.imageio.plugins.jpeg.JPEGImageWriteParam param = (JPEGImageWriteParam)                  
     writer.getDefaultWriteParam();
     param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
     param.setCompressionType("JPEG-LOSSLESS");`

这部分总是错误 param.setCompressionType("JPEG-LOSSLESS"); 错误是java.lang.IllegalArgumentException：未知的压缩类型！在 javax.imageio.ImageWriteParam.setCompressionType(ImageWriteParam.java:1023)

原文

Is there someone that can help to correct this code?

I'm working with JAI and I'm trying to compress JPG file to Losse-less
here's my code

     `ImageWriter writer= (JPEGImageWriter) ImageIO.getImageWritersByFormatName("jpeg").next();
     javax.imageio.plugins.jpeg.JPEGImageWriteParam param = (JPEGImageWriteParam)                  
     writer.getDefaultWriteParam();
     param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
     param.setCompressionType("JPEG-LOSSLESS");`

It's always error in this part param.setCompressionType("JPEG-LOSSLESS");
the error is java.lang.IllegalArgumentException: Unknown compression type! at javax.imageio.ImageWriteParam.setCompressionType(ImageWriteParam.java:1023)

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别闹i 2024-12-14 12:31:07

您只能使用支持的压缩类型。检查支持哪些param.getCompressionTypes()。

除此之外，尝试以下代码（使用更新的 jpeg 无损标准 JPEG-LS）：

ImageWriter writer = 
    (ImageWriter) ImageIO.getImageWritersByFormatName("jpeg").next();
ImageWriteParam param= writer.getDefaultWriteParam();
param.setCompressionMode(param.MODE_EXPLICIT);
param.setCompressionType("JPEG-LS");

You can only use compression types that are supported. Check which are supported by param.getCompressionTypes().

Other then that, try this code (using newer jpeg lossless standard JPEG-LS):

ImageWriter writer = 
    (ImageWriter) ImageIO.getImageWritersByFormatName("jpeg").next();
ImageWriteParam param= writer.getDefaultWriteParam();
param.setCompressionMode(param.MODE_EXPLICIT);
param.setCompressionType("JPEG-LS");

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