Java实现图片指定区域裁剪_java根据像素点位置截图

一 概述

        待续。

二 代码实例

        Java实现：

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
 
public class Image {
 
    public static void main(String[] args) {
        try {
            //注意image要比mask小
            BufferedImage image = ImageIO.read(Image.class.getResource("../resources/350h.jpg"));
            BufferedImage mask = ImageIO.read(Image.class.getResource("../resources/40.jpg"));
 
            File file = new File("C:/Users/windows/Desktop/test7.png");
 
            int offsetX = mask.getWidth();
            int offsetY = mask.getHeight();
            BufferedImage mixedImage = maskImage(image, mask, 100, 100);
            ImageIO.write(mixedImage, "png", file);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
 
    public static BufferedImage maskImage(BufferedImage image, BufferedImage mask, Integer offsetX, Integer offsetY) {
 
        int width = image.getWidth();
        int height = image.getHeight();
 
        // 关键在于这里新建的图片类型一定是TYPE_INT_ARGB的
        BufferedImage newImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
 
        int index = 0;
        for (int i = 0; i < width; i++) {
            for (int j = 0; j < height; j++) {
                index++;
                System.out.println("第" + index + "个点");
                // result[i][j] = bufImg.getRGB(i, j); int rgb = bufImg.getRGB(i, j);
                int pixel = image.getRGB(i, j);
                Color color = new Color(pixel);
                int r = color.getRed();
                int g = color.getGreen();
                int b = color.getBlue();
                System.out.println("横坐标为：" + i + "；纵坐标为：" + j + "的像素为值为" + pixel);
                System.out.println("\t红=" + r + "\t绿" + g + "\t蓝" + b);
                int alpha = (pixel >> 24) & 0xff;
                color = new Color(alpha);
                r = color.getRed();
                g = color.getGreen();
                b = color.getBlue();
                System.out.println("横坐标为：" + i + "；纵坐标为：" + j + "的像素为值为" + alpha);
                System.out.println("\t红=" + r + "\t绿" + g + "\t蓝" + b);
                int maskPixel = mask.getRGB(offsetX + i, offsetY + j);
                color = new Color(maskPixel);
                r = color.getRed();
                g = color.getGreen();
                b = color.getBlue();
                int x = offsetX + i;
                int y = offsetY + j;
                System.out.println("横坐标为：" + x + "；纵坐标为：" + y + "的像素为值为" + maskPixel);
                System.out.println("\t红=" + r + "\t绿" + g + "\t蓝" + b);
                int newPixel = alpha == 0 ? pixel : maskPixel;
                color = new Color(newPixel);
                r = color.getRed();
                g = color.getGreen();
                b = color.getBlue();
                System.out.println("横坐标为：" + x + "；纵坐标为：" + y + "的新像素为值为" + newPixel);
                System.out.println("\t红=" + r + "\t绿" + g + "\t蓝" + b);
                System.out.println("################################################################");
                newImage.setRGB(i, j, newPixel);
            }
        }
        return newImage;
    }
}

        解析待续。。。