Write swing component to large TIFF image using JAI

Question

I have a large swing component to write to TIFF. The component is too large to load the TIFF in memory, so I either need to make a big BufferedImage which is backed by a dis

Answer 1

I had to load and store a large tiff (59392x40192px) with JAI. My solution is: TiledImages.

I have used a TiledImage because I need tiles and subimages. To use the TiledImage efficient you should construct it with your prefered tile size. JAI uses a TileCache so not the whole Image will be in memory, when it's not needed.

To write the TiledImage in a File use the option "writeTiled" (avoid OutOfMemory because it writes tile by tile):

public void storeImage(TiledImage img, String filepath) {
    TIFFEncodeParam tep = new TIFFEncodeParam();
    //important to avoid OutOfMemory
    tep.setTileSize(256, 256);
    tep.setWriteTiled(true);
    //fast compression
    tep.setCompression(TIFFEncodeParam.COMPRESSION_PACKBITS);
    //write file
    JAI.create("filestore", img, filepath, "TIFF", tep);
}

It works fine with images up to 690mb (compressed), for larger images i haven't tested yet.

But if you are working on WinXP 32-bit you may not able to have more as 1280m HeapSpace size, this is still a limit of Java VM.

My TiledImage is build with a IndexedColorModel from my image-source data:

//here you create a ColorModel for your Image
ColorModel cm = source.createColorModel();
//then create a compatible SampleModel, with the tilesize
SampleModel sm = cm.createCompatibleSampleModel(tileWidth,tileHeight);

TiledImage image = new TiledImage(0, 0, imageWidth, imageHeight, 0, 0, sm, cm);

Answer 2

I had the same situation and I used these steps:

• Load as BufferedImage with JAI

• Resize BufferedImage size to preferable size (600x600px) maintaining aspect-ratio using Image#getScaledInstance(int w, int h, Image.SCALE_SMOOTH)

• Draw image using Graphics2d.drawImage(..) method in JComponent#paintComponent(java.awt.Graphics) method

That helped me with showing and manipulating TIFF images ~50MB (5000x5000px).