将多页TIFF图像拆分为单独的图像(Java)

Question

在这件事上我都抓狂了。

如何将多页/多层TIFF图像拆分为几个单独的图像？

演示图像可用here。

(首选纯Java (即非本机)解决方案。如果解决方案依赖于商业化的库，这并不重要。)

Answer 1

您可以使用TIFF高级成像库JAI来拆分多页，方法是使用以下ImageReader：

ImageInputStream is = ImageIO.createImageInputStream(new File(pathToImage));
if (is == null || is.length() == 0){
  // handle error
}
Iterator<ImageReader> iterator = ImageIO.getImageReaders(is);
if (iterator == null || !iterator.hasNext()) {
  throw new IOException("Image file format not supported by ImageIO: " + pathToImage);
}
// We are just looking for the first reader compatible:
ImageReader reader = (ImageReader) iterator.next();
iterator = null;
reader.setInput(is);

然后你可以得到页数：

nbPages = reader.getNumImages(true);

和单独阅读页面：

reader.read(numPage)

Answer 2

我在上面的示例中使用了我找到的一个名为imageio-tiff的tiff插件。

Maven依赖：

<dependency>
        <groupId>com.tomgibara.imageio</groupId>
        <artifactId>imageio-tiff</artifactId>
        <version>1.0</version>
        </dependency>

我能够从tiff资源中获得缓冲的图像：

   Resource img3 = new ClassPathResource(TIFF4);
            ImageInputStream is = ImageIO.createImageInputStream(img3.getInputStream());

            Iterator<ImageReader> iterator = ImageIO.getImageReaders(is);
            if (iterator == null || !iterator.hasNext()) {
                throw new IOException("Image file format not supported by ImageIO: ");
            }
            // We are just looking for the first reader compatible:
            ImageReader reader = (ImageReader) iterator.next();
            iterator = null;
            reader.setInput(is);
            int nbPages = reader.getNumImages(true);

            LOGGER.info("No. of pages for tiff file is {}", nbPages);
  BufferedImage image1 = reader.read(0);
        BufferedImage image2 = reader.read(1);
        BufferedImage image3 = reader.read(2);

但随后我发现了另一个名为apache commons Maven dependency的项目：

<dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-imaging</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>

在一行代码中，您可以获得缓冲的图像：

 List<BufferedImage> bufferedImages = Imaging.getAllBufferedImages(img3.getInputStream(), TIFF4);
        LOGGER.info("No. of pages for tiff file is {} using apache commons imaging", bufferedImages.size());

然后写入文件sample：

 final Map<String, Object> params = new HashMap<String, Object>();
        // set optional parameters if you like
        params.put(ImagingConstants.PARAM_KEY_COMPRESSION, new Integer(TiffConstants.TIFF_COMPRESSION_CCITT_GROUP_4));
        int i = 0;
        for (Iterator<BufferedImage> iterator1 = bufferedImages.iterator(); iterator1.hasNext(); i++) {
            BufferedImage bufferedImage = iterator1.next();
            LOGGER.info("Image type  {}", bufferedImage.getType());
            File outFile = new File("C:\\tmp" + File.separator + "shane" + i + ".tiff");
            Imaging.writeImage(bufferedImage, outFile, ImageFormats.TIFF, params);
        }

实际上测试性能，apache要慢得多……

或者使用旧版本的iText，它要快得多：

private ByteArrayOutputStream convertTiffToPdf(InputStream imageStream) throws IOException, DocumentException {
    Image image;
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    Document document = new Document();
    PdfWriter writer = PdfWriter.getInstance(document, out);
    writer.setStrictImageSequence(true);
    document.open();

    RandomAccessFileOrArray ra = new RandomAccessFileOrArray(imageStream);
    int pages = TiffImage.getNumberOfPages(ra);
    for (int i = 1; i <= pages; i++) {
        image = TiffImage.getTiffImage(ra, i);
        image.setAbsolutePosition(0, 0);
        image.scaleToFit(PageSize.A4.getWidth(), PageSize.A4.getHeight());
        document.setPageSize(PageSize.A4);
        document.newPage();
        document.add(image);
    }
    document.close();
    out.flush();
    return out;
}

Answer 3

一种快速但非JAVA的解决方案是tiffsplit。它是libtiff库的一部分。

在tiff文件的所有层中拆分它的示例命令如下：

tiffsplit image.tif

手册页说明了一切：

NAME
       tiffsplit - split a multi-image TIFF into single-image TIFF files

SYNOPSIS
       tiffsplit src.tif [ prefix ]

DESCRIPTION
       tiffsplit  takes  a multi-directory (page) TIFF file and creates one or more single-directory (page) TIFF files
       from it.  The output files are given names created by concatenating a prefix, a lexically ordered suffix in the
       range  [aaa-zzz],  the  suffix  .tif (e.g.  xaaa.tif, xaab.tif, xzzz.tif).  If a prefix is not specified on the
       command line, the default prefix of x is used.

OPTIONS
       None.

BUGS
       Only a select set of ‘‘known tags’’ is copied when splitting.

SEE ALSO
       tiffcp(1), tiffinfo(1), libtiff(3TIFF)

       Libtiff library home page: http://www.remotesensing.org/libtiff/