Join 2 Tiff files in 1 monopage Tiff file

Question

Hello everybody,
I'm trying to append 2 tiff files in 1 monopage tiff file with this specificity : the second will be appended below the first one.
Files have same columns numbers, but not the same lines number. I don't need to change images contents.
I'm new with JAI and I don't see wich way I have to go. Do I have to work on rasters, or on bufferedData ? Wich one will be quicker ?
Thanks in advance.

Answer 1

After you've installed JAI ImageIO
https://jai-imageio.dev.java.net/binary-builds.html
then the rest is trivial...
//load tiff images
BufferedImage tiff1 = ImageIO.read(/**File/URL to tif #1*/);
BufferedImage tiff2 = ImageIO.read(/**File/URL to tif #2*/);
//combine buffered images
BufferedImage newTiff = new BufferedImage(
        Math.max(tiff1.getWidth(), tiff2.getWidth()),
        tiff1.getHeight() + tiff2.getHeight(),
        BufferedImage.TYPE_3BYTE_BGR);
Graphics g = newTiff.getGraphics();
g.drawImage(tiff1,0,0,null);
g.drawImage(tiff2,0,tiff1.getHeight(),null);
g.dispose();
/*Write out result as a tiff.  Instead of using the easy way of
* ImageIO.write(...) I use the ImageWriter directly and specify
* I want LZW compression.  I do this because the default settings
* are used for ImageIO.write(...) and those default settings specify
* no compression which would cause a large tif file.*/
ImageWriter writer = ImageIO.getImageWritersByFormatName("tif").next();
ImageWriteParam param = writer.getDefaultWriteParam();
param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
param.setCompressionType("LZW");
writer.setOutput(
      ImageIO.createImageOutputStream(new java.io.File(/**output*/)));
writer.write(null, new IIOImage(newTiff,null,null),param);
writer.reset();
writer.dispose();The only time JAI comes in is loading a tif images and saving the resulting BufferedImage as a tif. The actual combining
of the images is simple Java2D.