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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I think what you published was very logical.
But, what about this? what if you added a little
information? I am not saying your information isn’t
good., however suppose you added something that grabbed a person’s attention? I mean java读取图片色彩值 | 月小升博客 is a little boring.
You should peek at Yahoo’s front page and see how they create news titles to grab viewers to
click. You might add a related video or a
related pic or two to get people interested
about everything’ve written. Just my opinion, it could bring your blog a little livelier.