How can I pixelate JPG with Java?

I'm trying to pixelate JPEG using java 6 and I don't have much luck It needs to work with Java - not an image processor like Photoshop, it needs to look like an old school - like this:

Who can help me?

Solution

Using Java awt. Image (Javadoc) and javax Imageio (Javadoc) API, you can easily traverse the pixels of an image and perform pixelation yourself

The example code is as follows You need at least these imports: javax imageio. ImageIO,java. awt. image. BufferedImage,java. awt. image. Raster,java. awt. image. Writableraster and Java io. File.

Example:

// How big should the pixelations be?
final int PIX_SIZE = 10;

// Read the file as an Image
img = ImageIO.read(new File("image.jpg"));

// Get the raster data (array of pixels)
Raster src = img.getData();

// Create an identically-sized output raster
WritableRaster dest = src.createCompatibleWritableRaster();

// Loop through every PIX_SIZE pixels,in both x and y directions
for(int y = 0; y < src.getHeight(); y += PIX_SIZE) {
    for(int x = 0; x < src.getWidth(); x += PIX_SIZE) {

        // Copy the pixel
        double[] pixel = new double[3];
        pixel = src.getPixel(x,y,pixel);

        // "Paste" the pixel onto the surrounding PIX_SIZE by PIX_SIZE neighbors
        // Also make sure that our loop never goes outside the bounds of the image
        for(int yd = y; (yd < y + PIX_SIZE) && (yd < dest.getHeight()); yd++) {
            for(int xd = x; (xd < x + PIX_SIZE) && (xd < dest.getWidth()); xd++) {
                dest.setPixel(xd,yd,pixel);
            }
        }
    }
}

// Save the raster back to the Image
img.setData(dest);

// Write the new file
ImageIO.write(img,"jpg",new File("image-pixelated.jpg"));

Editor: I think I should mention - as far as I know, double [] pixels are only RGB color values For example, when I dump a pixel, it looks like {204.0197.0189.0}, light tan