I am trying to take multiple multi-page .tif files and combine them into a single multi-page tif file.
I found some code in this question, but it only seems to take the first page of each individual .tif file and create the new multi-page .tif with those first pages.
Is there a small change I'm not seeing that would cause this same code to grab every page from the source .tif files and put them all into the combined .tif?
To clarify, I would like the source files:
to be combined into
I would also like to be able to specify a resolution and compression of the .tif, but I'm not sure if JAI supports that and it's not a necessity for a correct answer.
The code from the referenced question, modified by me to load all the .tif files in a directory, is below for easy answering:
public static void main(String[] args) {
String inputDir = "C:\\tifSources";
File sourceDirectory = new File(inputDir);
File file[] = sourceDirectory.listFiles();
int numImages = file.length;
BufferedImage image[] = new BufferedImage[numImages];
try
{
for (int i = 0; i < numImages; i++)
{
SeekableStream ss = new FileSeekableStream(file[i]);
ImageDecoder decoder = ImageCodec.createImageDecoder("tiff", ss, null);
PlanarImage op = new NullOpImage(decoder.decodeAsRenderedImage(0), null, null, OpImage.OP_IO_BOUND);
image[i] = op.getAsBufferedImage();
}
TIFFEncodeParam params = new TIFFEncodeParam();
OutputStream out = new FileOutputStream(inputDir + "\\combined.tif");
ImageEncoder encoder = ImageCodec.createImageEncoder("tiff", out, params);
List<BufferedImage> imageList = new ArrayList<BufferedImage>();
for (int i = 0; i < numImages; i++)
{
imageList.add(image[i]);
}
params.setExtraImages(imageList.iterator());
encoder.encode(image[0]);
out.close();
}
catch (Exception e)
{
System.out.println("Exception " + e);
}
}
I knew I was just missing some little part about iterating over the pages in a single .tif, I just wasn't sure where it was.
More searching on the internet led me to find that rather than doing:
PlanarImage op = new NullOpImage(decoder.decodeAsRenderedImage(0), null, null, OpImage.OP_IO_BOUND);
I wanted to iterate over every page in the current document with something like:
int numPages = decoder.getNumPages();
for(int j = 0; j < numPages; j++)
{
PlanarImage op = new NullOpImage(decoder.decodeAsRenderedImage(j), null, null, OpImage.OP_IO_BOUND);
images.add(op.getAsBufferedImage());
}
This adds every page of every .tif into the images List. One final trap was that the final call to
encoder.encode(images.get(0));
Would cause the first page to be in the new .tif twice, so I added an intermediate loop and List population that doesn't add the first page in the call to:
params.setExtraImages(imageList.iterator());
which keeps the first page out of the "ExtraImages" and it gets added with the call to encode.
Final updated code is:
public static void main(String[] args) {
String inputDir = "C:\\tifSources";
File faxSource = new File(inputDir);
File file[] = faxSource.listFiles();
System.out.println("files are " + Arrays.toString(file));
int numImages = file.length;
List<BufferedImage> images = new ArrayList<BufferedImage>();
try
{
for (int i = 0; i < numImages; i++)
{
SeekableStream ss = new FileSeekableStream(file[i]);
ImageDecoder decoder = ImageCodec.createImageDecoder("tiff", ss, null);
int numPages = decoder.getNumPages();
for(int j = 0; j < numPages; j++)
{
PlanarImage op = new NullOpImage(decoder.decodeAsRenderedImage(j), null, null, OpImage.OP_IO_BOUND);
images.add(op.getAsBufferedImage());
}
}
TIFFEncodeParam params = new TIFFEncodeParam();
OutputStream out = new FileOutputStream(inputDir + "\\combined.tif");
ImageEncoder encoder = ImageCodec.createImageEncoder("tiff", out, params);
List<BufferedImage> imageList = new ArrayList<BufferedImage>();
for (int i = 1; i < images.size(); i++)
{
imageList.add(images.get(i));
}
params.setExtraImages(imageList.iterator());
encoder.encode(images.get(0));
out.close();
}
catch (Exception e)
{
System.out.println("Exception " + e);
}
}