将彩色图像转换为灰度。
获取每个像素的红绿蓝值
获取这 3 种颜色的平均值。
用平均值替换 RGB 值。
-
根据修改后的颜色创建新的像素值。
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将新值设置为像素。
示例
import java.io.File;
import java.io.IOException;
import java.awt.Color;
import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;
public class Color2Grey {
public static void main(String args[])throws IOException {
//Reading the image
File file= new File("D:\Images\car.jpg");
BufferedImage img = ImageIO.read(file);
for (int y = 0; y < img.getHeight(); y++) {
for (int x = 0; x < img.getWidth(); x++) {
//Retrieving the values of a pixel
int pixel = img.getRGB(x,y);
//Creating a Color object from pixel value
Color color = new Color(pixel, true);
//Retrieving the R G B values
int red = color.getRed();
int green = color.getGreen();
int blue = color.getBlue();
//Finding the average of the red green blue values
int average = (red+green+blue)/3;
//Creating new Color object
color = new Color(average, average, average);
//Setting new Color object to the image
img.setRGB(x, y, color.getRGB());
}
}
//Saving the modified image
file = new File("D:\Images\grey_image.jpg");
ImageIO.write(img, "jpg", file);
System.out.println("Done...");
}
}输入

输出












