Converting PDF to multipage tiff (Group 4)

Question

I\'m trying to convert PDFs as represented by the org.apache.pdfbox.pdmodel.PDDocument class and the icafe library (https://github.com/dragon66/icafe/) to a multipage tiff w

Answer 1

Here's some code to save in a multipage tiff which I use with PDFBox. It requires the TIFFUtil class from PDFBox (it isn't public, so you have to make a copy).

void saveAsMultipageTIFF(ArrayList bimTab, String filename, int dpi) throws IOException
{
    Iterator writers = ImageIO.getImageWritersByFormatName("tiff");
    ImageWriter imageWriter = writers.next();

    ImageOutputStream ios = ImageIO.createImageOutputStream(new File(filename));
    imageWriter.setOutput(ios);
    imageWriter.prepareWriteSequence(null);
    for (BufferedImage image : bimTab)
    {
        ImageWriteParam param = imageWriter.getDefaultWriteParam();
        IIOMetadata metadata = imageWriter.getDefaultImageMetadata(new ImageTypeSpecifier(image), param);
        param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
        TIFFUtil.setCompressionType(param, image);
        TIFFUtil.updateMetadata(metadata, image, dpi);
        imageWriter.writeToSequence(new IIOImage(image, null, metadata), param);
    }
    imageWriter.endWriteSequence();
    imageWriter.dispose();
    ios.flush();
    ios.close();
}

I experimented on this for myself some time ago by using this code: https://www.java.net/node/670205 (I used solution 2)

However...

If you create an array with lots of images, your memory consumption really goes up. So it would probably be better to render an image, then add it to the tiff file, then render the next page and lose the reference of the previous one so that the gc can get the space if needed.