Quick hack to dump an image to JSON.

Png2Json.java

package com.firebase.sandbox;

import java.awt.Color;
import java.awt.image.BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;
import org.json.JSONObject;

public class Png2Json {
        public static void main(String[] args) {
		try {
			String f = "/Users/vikrum/Desktop/moo.png";
			BufferedImage image = ImageIO.read(new File(f));
			JSONObject json = new JSONObject();
			for(int i = 0; i < image.getWidth(); i++) {
				for(int j = 0; j < image.getHeight(); j++) {
					Color color = new Color(image.getRGB(i, j));
					if(color.getRGB() == -1) 
						continue;
					String hex = String.format("%02x%02x%02x", color.getRed(), color.getGreen(), color.getBlue());
					json.put(i + ":" + j, hex);
				}
			}
			System.out.println(json.toString());
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}