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but how do i make a loop to go through 2x2 portions of my array of array?

I am trying to work with this a two dimensional array, that represents greyscale of an image... I want to pixelate the image by averaging 2x2 blocks and replacing each value by the average of the 2x2...

help both :D

import java.util.Scanner;

public class data {

public static int setoriginal() { //prompt user to input 4 digit number
int n = 0;
int l = 0;

do {
...