【java/image】采用直接操作像素的办法对png图片进行反色处理

【需求】

从通达信截取的K线图是黑底白色，需要进行反色处理，再由打印机打印出来。

【代码】

package test240313;

import java.awt.image.BufferedImage;
import java.io.File;

import javax.imageio.ImageIO;

/**
 * 将单张图像进行反色处理
 *
 */
public class ImageTest {
    public static void main(String[] args) throws Exception {
        // 读png文件
        File inFile = new File("C:\\Users\\ufo\\Desktop\\2024-03-13_210728.png");
        BufferedImage img = ImageIO.read(inFile);

        // 取图像高宽
        int width = img.getWidth();
        int height = img.getHeight();

        // 遍历每个像素进行反色处理
        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                int rgb = img.getRGB(x, y);

                int red   = 255 - (rgb >> 16) & 0x0ff;
                int green = 255 - (rgb >> 8) & 0x0ff;
                int blue  = 255 - rgb & 0x0ff;

                rgb = (red << 16) | (green << 8) | blue;
                img.setRGB(x, y, rgb);
            }
        }

        // 写入新文件
        File outFile = new File("C:\\Users\\ufo\\Desktop\\1.png");
        ImageIO.write(img, "png", outFile);
    }
}

【代码2】

package test240314;

import java.awt.image.BufferedImage;
import java.io.File;

import javax.imageio.ImageIO;

/**
 * 将图像反色
 * @author ufo
 *
 */
public class InversePng2 {
    public static void main(String[] args) throws Exception{
        // 读png文件
        File inFile = new File("C:\\Users\\ufo\\Desktop\\2024-03-14_101208.png");
        BufferedImage srcImg = ImageIO.read(inFile);
        
        // 取原图高宽
        int width = srcImg.getWidth();
        int height = srcImg.getHeight();

        // 创建目标图
        BufferedImage dstImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

        // 挨个像素进行反色
        for(int i=0; i<width; i++){
            for(int j=0; j<height; j++){
                int rgb = srcImg.getRGB(i, j);
                dstImg.setRGB(i, j, 0XFFFFFF - rgb);
            }
        }
        
        // 写入新文件
        File outFile = new File("C:\\Users\\ufo\\Desktop\\2.png");
        ImageIO.write(dstImg, "png", outFile);
    }
}

【参考网页】

https://www.jianshu.com/p/6b2bbf95aee0

https://blog.51cto.com/u_13488278/3210482?articleABtest=0

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