使用 Java ImageIO 进行 Tiff 压缩 [英] Tiff compression using Java ImageIO

问题描述

我在将 png 转换为 tiff 时遇到问题.转换顺利，但图像很大.我认为问题是我没有正确进行压缩?有人有什么建议吗??

I am having issues converting a png to tiff. The conversion goes fine, but the image is huge. I think the issue is that I am not doing the compression correctly? Anyone have any suggestions??

这是代码示例

public static void test() throws IOException {

    // String fileName = "4958813_1";
    String fileName = "4848970_1";
    String inFileType = ".PNG";
    String outFileType = ".TIFF";

    ImageIO.scanForPlugins();

    File fInputFile = new File("I:/HPF/UU/" + fileName + inFileType);
    InputStream fis = new BufferedInputStream(new FileInputStream(
            fInputFile));
    PNGImageReaderSpi spi = new PNGImageReaderSpi();
    ImageReader reader = spi.createReaderInstance();

    ImageInputStream iis = ImageIO.createImageInputStream(fis);
    reader.setInput(iis, true);
    BufferedImage bi = reader.read(0);

    TIFFImageWriterSpi tiffspi = new TIFFImageWriterSpi();
    ImageWriter writer = tiffspi.createWriterInstance();
    //Iterator<ImageWriter> iter =  ImageIO.getImageWritersByFormatName("TIFF");
    //ImageWriter writer = iter.next();

    ImageWriteParam param = writer.getDefaultWriteParam();
    param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);

    param.setCompressionType("LZW");
    param.setCompressionQuality(0.5f);
    File fOutputFile = new File("I:\\HPF\\UU\\" + fileName + outFileType);
    ImageOutputStream ios = ImageIO.createImageOutputStream(fOutputFile);
    writer.setOutput(ios);
    writer.write(bi);

}

推荐答案

Writer.getDefaultWriteParam() 只创建一个 ImageWriteParam 对象，它不会将它链接回其他的.

Writer.getDefaultWriteParam() only creates an ImageWriteParam object, it doesn't link it back to anything else.

我在您的代码中没有看到任何机制可以让您修改后的 param 对象随后在 ImageWriter 中使用.

I don't see any mechanism in your code for your modified param object to be subsequently used in the ImageWriter.

我相信，而不是:

writer.write(bi);

你需要使用:

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

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