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How to flip vertical / mirror a bitmap using JAI ?

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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clo1
Asked:
clo1
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1 Solution
 
ia_ia_ia_1Commented:
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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clo1Author Commented:
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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clo1Author Commented:
Because my java program ia an application, not a applet. So please provide the code for application. Thanks so much !!!
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yongsingCommented:
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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ia_ia_ia_1Commented:
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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yongsingCommented:
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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clo1Author Commented:
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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yongsingCommented:
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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clo1Author Commented:
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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yongsingCommented:
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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clo1Author Commented:
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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yongsingCommented:
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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yongsingCommented:
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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clo1Author Commented:
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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clo1Author Commented:
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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yongsingCommented:
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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clo1Author Commented:
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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clo1Author Commented:
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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clo1Author Commented:
It's work. Thanks !
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yongsingCommented:
Thanks for the points. Glad to be of help!
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