Here you can find the source of imageToShape(BufferedImage image)
public static Shape imageToShape(BufferedImage image)
//package com.java2s; /*//from w w w .j a va 2 s . co m * Copyright (C) 2010-2014 JPEXS * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ import java.awt.Rectangle; import java.awt.Shape; import java.awt.geom.Area; import java.awt.image.BufferedImage; public class Main { public static Shape imageToShape(BufferedImage image) { Area area = new Area(); Rectangle rectangle = new Rectangle(); int y1, y2; for (int x = 0; x < image.getWidth(); x++) { y1 = Integer.MAX_VALUE; y2 = -1; for (int y = 0; y < image.getHeight(); y++) { int rgb = image.getRGB(x, y); rgb = rgb >>> 24; if (rgb > 0) { if (y1 == Integer.MAX_VALUE) { y1 = y; y2 = y; } if (y > (y2 + 1)) { rectangle.setBounds(x, y1, 1, y2 - y1 + 1); area.add(new Area(rectangle)); y1 = y; } y2 = y; } } if ((y2 - y1) >= 0) { rectangle.setBounds(x, y1, 1, y2 - y1 + 1); area.add(new Area(rectangle)); } } return area; } }