image - How to obtain the red, green and blue values from gray value in java? -

i obtain gray value of pixel :

val=img.getrgb(j, i) & 0xff; 

for processing purpose.

now , after processing want red, green , blue values back. how do this?

here sample code obtain r, g, b, alpha, , gray-scale values pixel @ coordinates (x, y) on bufferedimage.

bufferedimage image;          // assume have image int rgb = image.getrgb(x, y); // desired pixel int r = (rgb >> 16) & 0xff;  int g = (rgb >> 8) & 0xff; int b = (rgb & 0xff); int alpha = (rgb >> 24) & 0xff;  int gray = (r + g + b) / 3; // rgb not affected