File newFile = null;
    BufferedImage oldImage = null;
    BufferedImage newImage = null;
    String fileName = new String((args[0]));

    String newFileName = new String(fileName.replaceFirst(".png", "-tiled.png"));

    try{
        oldImage = ImageIO.read(new File(fileName));
        System.out.println("Reading Complete");
                }
    catch(IOException e) {
    System.out.println("Error: "+ e);
    }

    int width = oldImage.getWidth();
    int height = oldImage.getHeight();
    newImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

    int imagePixels [][] = new int [height][width];
        for (int i = 0; i < height -1; ++i) {
        for (int j = 0; j < width - 1; ++j) {
            imagePixels[i][j] = oldImage.getRGB(i,j); //error here

            }
    }

"Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: Coordinate out of bounds!
    at sun.awt.image.ByteInterleavedRaster.getDataElements(Unknown Source)
    at java.awt.image.BufferedImage.getRGB(Unknown Source)
    at imagery.ImageTiler.main(ImageTiler.java:35)

for (int i = 0; i < width -1; ++i) {
for (int j = 0; j < height - 1; ++j) {
    imagePixels[i][j] = oldImage.getRGB(i,j); //error here

}