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How to flip vertical / mirror a bitmap using JAI ?

Posted on 2001-09-17
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Last Modified: 2013-11-19
I have a bitmap file (just black and white), and I would like to use JAI (Java Advanced Imaging) or anything from java to flip the bitmap vertically or mirror it. Please give me sample code on how to do it. By the way, my java is an application, not an applet. Please kindly provide the code for app. instead of an applet. Thanks !!

PS... IT IS A "BITMAP" image
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Question by:clo1
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Expert Comment

by:ia_ia_ia_1
ID: 6489795
This is a sample code, drawing a flipped image on a panel:
public class MyPanel extends JPanel {

    String filename = "D:/work/EE/dist2.gif";
    Image image;

    public MyPanel() {
        image = Toolkit.getDefaultToolkit().createImage(filename);
        setSize(image.getWidth(this), image.getHeight(this));
        setBackground(Color.green);
    }

    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D) g;
        g2.rotate(Math.toRadians(90), getWidth()/2, getHeight()/2);
        g2.drawImage(image, 0, 0, getWidth(), getHeight(), this);
    }
}

As u could see, the flipping is done by the rotate method of Graphics2D. If you are not using Java2, tell me and I'll try to work out it without this cast: Graphics2D g2 = (Graphics2D) g;
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Author Comment

by:clo1
ID: 6489886
Thanks and appreciate for your sample code. But is there any code which can let me save it back to a file instead of showing in the panel?? I will give you points when you have post it. Thanks again !!!
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Author Comment

by:clo1
ID: 6489892
Because my java program ia an application, not a applet. So please provide the code for application. Thanks so much !!!
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Expert Comment

by:yongsing
ID: 6490001
You can use JAI to do it:

// Imports
import javax.media.jai.*;
import java.awt.image.renderable.ParameterBlock;

// ...

// Load the image
String fileName = "images/Trees.jpg";
PlanarImage image = (PlanarImage)JAI.create("fileload", fileName);

// Flip the image vertically
ParameterBlock pb = new ParameterBlock();
pb.add(image);
pb.add(TransposeDescriptor.FLIP_VERTICAL);
RenderOp newImage = JAI.create("transpose", pb);

// Save the image
String outputFile = "images/Trees1.jpg";
JAI.create("filestore", newImage, outputFile, "jpeg", null);
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Expert Comment

by:ia_ia_ia_1
ID: 6490068
I'm sorry I'm not familiar with JAI.
This is what I could think of so far:

import javax.swing.JPanel;
import java.awt.*;
import java.io.*;
import java.awt.image.*;
import com.sun.image.codec.jpeg.*;


public class MyPanel extends JPanel {

    String filename = "D:/work/EE/AskAQuestion.jpg";
    Image image;

    public MyPanel() {
        image = Toolkit.getDefaultToolkit().createImage(filename);

        while (image.getHeight(null) == -1) {};
        setSize(image.getWidth(this), image.getHeight(this));
        setBackground(Color.green);

    }

    public BufferedImage flip() throws Exception {
        int size = Math.max(image.getHeight(this), image.getWidth(this));
        BufferedImage bi = new BufferedImage(size, size, BufferedImage.TYPE_INT_RGB);
        Graphics2D g2 = bi.createGraphics();
        g2.rotate(Math.toRadians(90), size/2, size/2);
        g2.drawImage(image, 0, 0, image.getWidth(this), image.getHeight(this), null);
        File file = new File("test.jpg");
        FileOutputStream out = new FileOutputStream(file);
        JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
        JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(bi);
        param.setQuality(1.0f, true);
        encoder.setJPEGEncodeParam(param);
        encoder.encode(bi);

        out.close();
        g2.dispose();

        FileInputStream in = new FileInputStream(file);
        JPEGImageDecoder decoder = JPEGCodec.createJPEGDecoder(in);
        return decoder.decodeAsBufferedImage();

    }

    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D) g;
        try {
            g2.drawImage(flip(), 0, 0, getWidth(), getHeight(), this);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

There are still some minor issues related to the size of the image. If u would like to use the approach, I'll fix them.
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Expert Comment

by:yongsing
ID: 6492144
The example below is a working program using JAI to read an image, flip it vertically and horizontally, and then save it.

import javax.media.jai.*;
import javax.media.jai.operator.*;
import java.awt.image.renderable.ParameterBlock;

public class Test {

    public static void main(String[] args) {

        // Load the image
        String fileName = "update.jpg";
        PlanarImage image = (PlanarImage)JAI.create("fileload", fileName);

        // Flip the image vertically
        PlanarImage image1 = (PlanarImage)JAI.create("transpose", image, TransposeDescriptor.FLIP_VERTICAL);

        // Flip the image horizontally
        PlanarImage newImage = (PlanarImage)JAI.create("transpose", image1, TransposeDescriptor.FLIP_HORIZONTAL);

        // Save the image
        String outputFile = "update1.jpg";
        JAI.create("filestore", newImage, outputFile, "jpeg", null);
    }
}
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Author Comment

by:clo1
ID: 6492254
yongsing, I have tried, but I can even get this to run. You know, what I want to flip is a bitmap image, would that be the cause of the problem? Please help me again. Thanks a lot !!!
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Expert Comment

by:yongsing
ID: 6492283
Did you try my code? I have tried it and it is working fine for me here.

Are you using JAI? You need to download the software and set the classpath to get it to work.
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Author Comment

by:clo1
ID: 6492308
Yes. But my image is a bitmap. Would that be a problem? Cause I saw your coding is using a jpg file. Thanks
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Expert Comment

by:yongsing
ID: 6492315
It shouldn't be a problem. JAI can read JPG, BMP, GIF, PNG etc files.

String fileName = "somefile.bmp";
PlanarImage image = (PlanarImage)JAI.create("fileload", fileName);

Have you tried it out?
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Author Comment

by:clo1
ID: 6492332
Yes. But my image is a bitmap. Would that be a problem? Cause I saw your coding is using a jpg file. Thanks
0
 
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Expert Comment

by:yongsing
ID: 6492339
No, it is not a problem. Will you please try it out? Just subsitute the file name for your bitmap file:

String fileName = "somefile.bmp";
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Expert Comment

by:yongsing
ID: 6492341
You can also save back the image in BMP format (version 3):

String outputFile = "somefile.bmp";
JAI.create("filestore", newImage, outputFile, "bmp", null);
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Author Comment

by:clo1
ID: 6492347
Yes. But my image is a bitmap. Would that be a problem? Cause I saw your coding is using a jpg file. Thanks
0
 
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Author Comment

by:clo1
ID: 6492348
Yes. But my image is a bitmap. Would that be a problem? Cause I saw your coding is using a jpg file. Thanks
0
 
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Accepted Solution

by:
yongsing earned 300 total points
ID: 6492364
Will you stop repeating the question and just try out my program? Here's how you read a BMP file, flip it, and then save back as a BMP file:

import javax.media.jai.*;
import javax.media.jai.operator.*;
import java.awt.image.renderable.ParameterBlock;

public class Test {

    public static void main(String[] args) {
        // Load the image
        String fileName = "somefile.bmp";
        PlanarImage image = (PlanarImage)JAI.create("fileload", fileName);

        // Flip the image vertically
        PlanarImage image1 = (PlanarImage)JAI.create("transpose", image, TransposeDescriptor.FLIP_VERTICAL);

        // Flip the image horizontally
        PlanarImage newImage = (PlanarImage)JAI.create("transpose", image1, TransposeDescriptor.FLIP_HORIZONTAL);

        // Save the image
        String outputFile = "somefile.bmp";
        JAI.create("filestore", newImage, outputFile, "bmp", null);
    }
}
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Author Comment

by:clo1
ID: 6492382
I didn't repeat the question. It's the Experts-exchange problem. I have tried. And it stop on the first line of your code. I donno why, but I am examing the problem now. I think it's the absent of the jai_cors.jar. I will get back to you later..Thanks
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Author Comment

by:clo1
ID: 6492384
Yes. But my image is a bitmap. Would that be a problem? Cause I saw your coding is using a jpg file. Thanks
0
 
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Author Comment

by:clo1
ID: 6492397
It's work. Thanks !
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Expert Comment

by:yongsing
ID: 6492405
Thanks for the points. Glad to be of help!
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