Image Processing in Java | Set 7 (Creating a random pixel image)

We strongly recommend to refer below post as a prerequisite of this.

In this set we will be creating a random pixel image. For creating a random pixel image, we don’t need any input image We can create an image file and set its pixel values generated randomly.

Algorithm:

Set the dimension of new image file.
Create a BufferedImage object to hold the image [ import java.awt.image.BufferedImage; ]. This object is used to store an image in RAM.
Generate random number values for alpha, red, green and blue components.
Set the randomly generated ARGB (Alpha, Red, Green and Blue) values.
Repeat the steps 3 and 4 for each pixels of the image.

Implementation of the above algorithm:

// Java program to demonstrate creation of random pixel image 
import java.io.File; 
import java.io.IOException; 
import java.awt.image.BufferedImage; 
import javax.imageio.ImageIO; 
public class RandomImage 
{ 
    public static void main(String args[])throws IOException 
    { 
        // Image file dimensions 
        int width = 640, height = 320; 
  
        // Create buffered image object 
        BufferedImage img = null; 
        img = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB); 
  
        // file object 
        File f = null; 
  
        // create random values pixel by pixel 
        for (int y = 0; y < height; y++) 
        { 
            for (int x = 0; x < width; x++) 
            { 
                int a = (int)(Math.random()*256); //generating 
                int r = (int)(Math.random()*256); //values 
                int g = (int)(Math.random()*256); //less than 
                int b = (int)(Math.random()*256); //256 
  
                int p = (a<<24) | (r<<16) | (g<<8) | b; //pixel 
  
                img.setRGB(x, y, p); 
            } 
        } 
  
        // write image 
        try
        { 
            f = new File("G:\\Out.jpg"); 
            ImageIO.write(img, "jpg", f); 
        } 
        catch(IOException e) 
        { 
            System.out.println("Error: " + e); 
        } 
    } 
} 

Note : Code will not run on online ide since it writes image in drive.

Output:

Out.jpg

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