package cc.mrbird.febs.mall.test;
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import javax.imageio.ImageIO;
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import java.awt.*;
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import java.awt.image.BufferedImage;
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import java.awt.image.RenderedImage;
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import java.io.File;
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import java.io.IOException;
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public class getGray {
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/**
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* 将输入的图片转换成灰度图片
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* @param bufferedImage_start
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* @return
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*/
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public static BufferedImage gray(BufferedImage bufferedImage_start){ //定义灰度方法 返回值为BufferedImage对象
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int width = bufferedImage_start.getWidth();
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int height =bufferedImage_start.getHeight();
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BufferedImage bufferedImage_end = new BufferedImage(width,height, BufferedImage.TYPE_3BYTE_BGR ); //构建新的对象模型
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// 遍历图片的RGB值，把得到的灰度值存到bufferedImage_end中，然后返回bufferedImage_end
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for (int y = 0; y < height; y++) {
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for (int x = 0; x < width; x++) {
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int pixel = bufferedImage_start.getRGB(x, y);
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int[] rgb = new int[3]; //分别表示红绿蓝RGB。
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rgb[0] = pixel >> 16 & 0xff;
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rgb[1] = pixel >> 8 & 0xff;
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rgb[2] = pixel & 0xff;
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int gray = (rgb[0] * 28 + rgb[1] * 151 + rgb[2] * 77) >> 8;
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// Color color = new Color(bufferedImage_start.getRGB(x,y));//构建Color获取图片像素点
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// int gray = (int)(color.getRed() * 0.2126 + color.getGreen() * 0.7152 + color.getBlue() * 0.0722);
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Color color_end = new Color(gray,gray,gray); //将设置的像素设置到bufferedImage_end
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bufferedImage_end.setRGB(x,y,color_end.getRGB());
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}
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}
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return bufferedImage_end;
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}
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public static void main(String[] args) {
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try{
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RenderedImage rendImage =gray(ImageIO.read(new File("D:\\image\\inputDpi.png")));
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File file = new File("D:\\image\\outDpi.png");
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ImageIO.write(rendImage, "png", file);
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}catch(IOException e){
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System.out.println(e);
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}
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}
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}
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