Constructing Image From 2D Array in Java

Question

I want to create the Image from 2D Array.I used BufferImage concept to construct Image.but there is difference betwwen original Image and constructed Image is displayed by image below

This is My original image

Image After reconstruction

I am using the following code

import java.awt.image.BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;

/** * * @author pratibha */

public class ConstructImage{
    int[][] PixelArray;
    public ConstructImage(){
        try{

        BufferedImage bufferimage=ImageIO.read(new File("D:/q.jpg"));
        int height=bufferimage.getHeight();
        int width=bufferimage.getWidth();
        PixelArray=new int[width][height];
        for(int i=0;i<width;i++){
            for(int j=0;j<height;j++){
                PixelArray[i][j]=bufferimage.getRGB(i, j);
            }
        }
        ///////create Image from this PixelArray
        BufferedImage bufferImage2=new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);

        for(int y=0;y<height;y++){
            for(int x=0;x<width;x++){
                int Pixel=PixelArray[x][y]<<16 | PixelArray[x][y] << 8 | PixelArray[x][y];
                bufferImage2.setRGB(x, y,Pixel);
            }


        }

         File outputfile = new File("D:\\saved.jpg");
            ImageIO.write(bufferImage2, "jpg", outputfile);


        }
        catch(Exception ee){
            ee.printStackTrace();
        }
    }

    public static void main(String args[]){
        ConstructImage c=new ConstructImage();
    }
}

how we can defined Pixel Array? I have no Idea.Can u guide me — Sumit
– Sumit, Commented Aug 10, 2012 at 7:40
i looked at some structures and seen that it was r,g,b,alpha or alpha,r,g,b — huseyin tugrul buyukisik
– huseyin tugrul buyukisik, Commented Aug 10, 2012 at 7:41

dacwe · Accepted Answer · 2012-08-10 07:52:08Z

8

You get a ARGB value from getRGB and the setRGB takes a ARGB value, so doing this is enough:

bufferImage2.setRGB(x, y, PixelArray[x][y]);

From the API of BufferedImage.getRGB:

Returns an integer pixel in the default RGB color model (TYPE_INT_ARGB) and default sRGB colorspace.

...and from the API of BufferedImage.setRGB:

Sets a pixel in this BufferedImage to the specified RGB value. The pixel is assumed to be in the default RGB color model, TYPE_INT_ARGB, and default sRGB color space.

On the other hand I would recommend you do paint the image instead:

Graphics g = bufferImage2.getGraphics();
g.drawImage(g, 0, 0, null);
g.dispose();

Then you wouldn't need to worry about any color model etc.

edited Aug 10, 2012 at 7:52

answered Aug 10, 2012 at 7:46

dacwe

43.6k12 gold badges118 silver badges142 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

dacwe Over a year ago

No problem :) Added a Graphics.drawImage example aswell.. maybe easier for you!

fommil Over a year ago

@Sumit you're forgetting to click the tick mark when people answer. You've done it here and in my answer earlier ;-) hint hint

Collectives™ on Stack Overflow

Constructing Image From 2D Array in Java

1 Answer 1

2 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related