Image img;

private int getBilinearColor(double x, double y)
    {
        int x1 = (int)Math.floor(x);
        int x2 = (int)Math.ceil(x);
        x1 = x1 < 0 ? 0 : x1;
        x1 = x1 >= image.getWidth() ? image.getWidth()-1 : x1;
        x2 = x2 < 0 ? 0 : x1;
        x2 = x2 >= image.getWidth() ? x1 : x2;
        double a = x-x1;

        int y1 = (int)Math.floor(y);
        int y2 = (int)Math.ceil(y);

        y1 = y1 < 0 ? 0 : y1;
        y1 = y1 >= image.getHeight() ?  image.getHeight() - 1 : y1;
        y2 = y2 < 0 ? 0 : y2;
        y2 = y2 >= image.getHeight() ? y1 : y2;

        int[] c1 = Utils.RGB2int(image.getRGB(x1, y1));
        int[] c2 = Utils.RGB2int(image.getRGB(x2, y1));
        int kA = Utils.int2RGB((int)((1-a)*c1[0] + a*c2[0]), (int)((1-a)*c1[1] + a*c2[1]), (int)((1-a)*c1[2] + a*c2[2]));

        c1 = Utils.RGB2int(image.getRGB(x1, y1));
        c2 = Utils.RGB2int(image.getRGB(x1, y2));
        int kB = Utils.int2RGB((int)((1-a)*c1[0] + a*c2[0]), (int)((1-a)*c1[1] + a*c2[1]), (int)((1-a)*c1[2] + a*c2[2]));

        double b = y-y1;

        c1 = Utils.RGB2int(kA);
        c2 = Utils.RGB2int(kB);
        int kC = Utils.int2RGB((int)((1-b)*c1[0] + b*c2[0]), (int)((1-b)*c1[1] + b*c2[1]), (int)((1-b)*c1[2] + b*c2[2]));

        return kC;
    }