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当我尝试将“.jpg”文件的内容复制到新的“.tif”文件时，不会保留 IIOMetadata。我需要保留的主要元数据标签是：compressionTypeName、horizo​​ntalPixelSize 和 VerticalPixelSize。
这是复制过程的简化代码：

public void stackOverflowQuestion(File fileToRead) {
    ImageReader reader; 
    ImageWriter writer=null;
    FileImageInputStream fileImageInputStream;
    BufferedImage bufferedImageReadImage;
    IIOMetadata iioMetadataReadImage;
    IIOMetadata iioMetaDataImageToWrite;
    IIOImage iioImage;
    ImageWriteParam imageWriteParams;
    ImageReadParam imageReadParam;
    File newFile;
    ImageTypeSpecifier imageTypeSpecifierDestino;

    reader = this.createImageReaderBySuffix("jpg");//(parameter’s extension)
    try {
        fileImageInputStream=new FileImageInputStream(fileToRead);
        reader.setInput(fileImageInputStream);
        writer = ImageIO.getImageWritersBySuffix("tif").next();
        imageReadParam=reader.getDefaultReadParam();
        bufferedImageReadImage = reader.read(0,imageReadParam);
        iioMetadataReadImage = reader.getImageMetadata(0);
        if (bufferedImageReadImage!=null) {
            newFile =getNewFile();//simply gets a new empty file.
            writer.setOutput(new FileImageOutputStream(newFile));
            writer.prepareWriteSequence(null);
            imageTypeSpecifierDestino = ImageTypeSpecifier.createFromBufferedImageType(bufferedImageReadImage.getType());
            imageWriteParams = (ImageWriteParam) writer.getDefaultWriteParam();
            imageWriteParams.setDestinationType( ImageTypeSpecifier.createFromBufferedImageType( bufferedImageReadImage.getType()) ) ;
            imageWriteParams.setCompressionMode( ImageWriteParam.MODE_COPY_FROM_METADATA );
            iioMetaDataImageToWrite= writer.convertImageMetadata(iioMetadataReadImage, imageTypeSpecifierDestino, imageWriteParams);
            //at this point, the metadata is spoiled
            iioImage=new IIOImage(bufferedImageReadImage, null, iioMetaDataImageToWrite);
            writer.writeToSequence(iioImage, imageWriteParams);
        }
    } catch (Exception e) {
}

这是包含在读取的 .jpg 文件中的“javax_imageio_1.0”格式中包含的元数据： 

<javax_imageio_1.0>
<Chroma>
    <ColorSpaceType name="YCbCr"/>
    <NumChannels value="3"/>    
</Chroma>
<Compression>
    <CompressionTypeName value="JPEG"/>
    <Lossless value="FALSE"/>
    <NumProgressiveScans value="1"/>
</Compression>
<Dimension>
    <PixelAspectRatio value="1.0"/>
    <ImageOrientation value="normal"/>
    <HorizontalPixelSize value="0.16933332"/>
    <VerticalPixelSize value="0.16933332"/>
</Dimension>

这是我的程序在 .tif 文件中写入的相同格式名称“javax_imageio_1.0”中包含的元数据

<javax_imageio_1.0>
<Chroma>
    <ColorSpaceType name="RGB"/>
    <NumChannels value="1"/>
    <BlackIsZero/>
</Chroma>
<Compression>
    <CompressionTypeName value="None"/>
</Compression>
<Data>
    <PlanarConfiguration value="PixelInterleaved"/>
    <SampleFormat value="UnsignedIntegral"/>
    <BitsPerSample value="1"/>
     <SampleMSB value="0"/>
</Data>
<Dimension>
    <PixelAspectRatio value="1.0"/>
        <HorizontalPixelSize value="5.905523436069756"/>
        <VerticalPixelSize value="5.905523436069756"/>
</Dimension>    
<Document>
    <FormatVersion value="6.0"/>
</Document>

CompressionTypeName、Horizo​​ntalPixelSize 和 VerticalPixelSize 值丢失或更改。

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