Manipulate colors separately in bitmap

SOLVED

I have an array holding pixel values as Java int (32bit) thus in the form AARRGGBB I want to manipulate colors indipendently, so my source image will turn more green, or more red or more blue. How can I do this in Java? (this code works now)

/* Extract green from pixel (0-255)
 * short is 16 bit, because all Java types开发者_C百科 are signed
 * so a Java byte would be-128 +128 */
short green = (short) ((pixel >> 8) & 0xff);
// Add some amount
short newGreen = green + 50;
green = (newGreen > 255) ? (short)255 : newGreen;
// Now final step
int mask = 0xffff00ff;
pixels[index] = (pixel & mask) | ((green & 0xff) << 8);

SOLVED

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           public static void toGreenScale(BufferedImage bi){
                   for (int i = 0; i < bi.getWidth(); i++){
                        for (int j = 0; j < bi.getHeight(); j++)
           {
             int rgb = bi.getRGB(i, j);
             int red = (rgb >> 16) & 0xFF;
             int green = (rgb >> 16) & 0xFF;
             int blue = (rgb >> 16) & 0xFF;

             int r= (red   << 16) | (red   << 8) | red;
             int g = (green << 16) | (green << 8) | green;
             int b = (blue  << 16) | (blue  << 8) | blue;
              g=g+50;//add an if condition to handle if g>255
              Color c=new Color(r,g,b);
           bi.setRGB(i,j,c.getRGB(););}
           }

}