java读取图片色彩值

读取图片的色彩值,是图片识别的基础逻辑。

package com.javaer.image;
 
import java.awt.AWTException;
import java.awt.Dimension;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.io.File;
 
import javax.imageio.ImageIO;
 
public class ReadColor {
	/**
	 * 读取一张图片的RGB值
	 * @throws Exception
	 */
	public void getImagePixel(String image) throws Exception {
		int[] rgb = new int[3];
		File file = new File(image);
		BufferedImage bi = null;
		try {
			bi = ImageIO.read(file);
		} catch (Exception e) {
			e.printStackTrace();
		}
		int width = bi.getWidth();
		int height = bi.getHeight();
		int minx = bi.getMinX();
		int miny = bi.getMinY();
		System.out.println("width=" + width + ",height=" + height + ".");
		System.out.println("minx=" + minx + ",miniy=" + miny + ".");
		for (int i = minx; i < width; i++) {
			for (int j = miny; j < height; j++) {
				int pixel = bi.getRGB(i, j); //下面三行代码将一个数字转换为RGB数字
				rgb[0] = (pixel & 0xff0000) >> 16;
				rgb[1] = (pixel & 0xff00) >> 8;
				rgb[2] = (pixel & 0xff);
				 System.out.println("i="+i+",j="+j+":("+rgb[0]+","+rgb[1]+","+rgb[2]+")");
			}
		}
	}
 
	/**
	 * 返回屏幕色彩值
	 * 
	 * @param x
	 * @param y
	 * @return
	 * @throws AWTException
	 */
	public int getScreenPixel(int x, int y) throws AWTException { // 函数返回值为颜色的RGB值。
		Robot rb = null; // java.awt.image包中的类,可以用来抓取屏幕,即截屏。
		rb = new Robot();
		Toolkit tk = Toolkit.getDefaultToolkit(); // 获取缺省工具包
		Dimension di = tk.getScreenSize(); // 屏幕尺寸规格
		System.out.println(di.width);
		System.out.println(di.height);
		Rectangle rec = new Rectangle(0, 0, di.width, di.height);
		BufferedImage bi = rb.createScreenCapture(rec);
		int pixelColor = bi.getRGB(x, y);
 
		return 16777216 + pixelColor; // pixelColor的值为负,经过实践得出:加上颜色最大值就是实际颜色值。
	}
 
	/**
	 * @param args
	 */
	public static void main(String[] args) throws Exception {
		int x = 0;
		ReadColor rc = new ReadColor();
		x = rc.getScreenPixel(100, 345);
		System.out.println(x + " - ");
		rc.getImagePixel("/a.jpg");
	}
 
}


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