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Java Framework based on Spring Framework, Freemarker and Simplicity

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package com.clickntap.tool.image;

import java.awt.Color;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import com.clickntap.utils.ImageUtils;

public class Mosaic {

  private BufferedImage image;

  public static double colourDistance(Color e1, Color e2) {
    long rmean = ((long) e1.getRed() + (long) e2.getRed()) / 2;
    long r = (long) e1.getRed() - (long) e2.getRed();
    long g = (long) e1.getGreen() - (long) e2.getGreen();
    long b = (long) e1.getBlue() - (long) e2.getBlue();
    return Math.sqrt((((512 + rmean) * r * r) >> 8) + 4 * g * g + (((767 - rmean) * b * b) >> 8));
  }

  public List exec() {
    List map = new ArrayList();
    int i = 0;
    int j = 0;
    for (i = 0; i < image.getWidth(); i += image.getWidth() / 60) {
      for (j = 0; j < image.getHeight(); j += image.getHeight() / 60) {
        if (image.getRGB(i, j) == 0xFFFFFF) {
          map.add(0);
        } else {
          map.add(1);
        }
      }
    }
    return map;
  }

  public void setInput(String filename) throws Exception {
    image = ImageUtils.open(filename);
  }

  public void setInput(File file) throws Exception {
    image = ImageUtils.open(file);
  }

  public void setInput(InputStream in) throws Exception {
    image = ImageUtils.open(in);
  }

}