Problems with ImageIO.write()
Well I am finding it very strange with ImageIO.write();
Consider the following code snippet:
//....
BufferedImage img=ImageIO.read(new File("fw2.jpg"));
BufferedImage img1=new BufferedImage(img.getWidth(),img.getHeight(),img.TYPE_INT_ARGB);
for(int i=0;i<img.getHeight();i++)
{
for(int j=0;j<img.getWidth();j++)
{
img1.setRGB(j,i,img.getRGB(j,i));
}
}
ImageIO.write(img1,"jpg",new File("fwinv.jpg"));
So simply I am copying fw2.jpg to fwinv.jpg. fw2.jpg was also created
using ImageIO.write().
But the two files are having different pixel values.
i.e If I read fwinv.jpg again I will get different pixel value that it was written.
Why is this...Can any one please help me..>
[796 byte] By [
chetan_kra] at [2007-11-26 13:08:45]
# 1
Reading the written images back and displaying them in java works okay. The third image looks okay in RGB but wrong in ARGB when displayed by a native app. For more about this see reply 1 in [url=http://forum.java.sun.com/thread.jspa?threadID=770344]Color problems[/url] and the linked bug report: [url=http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4836466]Some Images written using JPEG Image Writer are not recognized by native applns[/url].
import java.awt.GridLayout;
import java.awt.image.BufferedImage;
import java.io.*;
import javax.imageio.ImageIO;
import javax.swing.*;
public class WriteTest {
private JPanel getContent(BufferedImage src) throws IOException {
File fileOne = new File("fileOne.jpg");
ImageIO.write(src, "jpg", fileOne);
BufferedImage image1 = ImageIO.read(fileOne);
BufferedImage image2 = copy(image1);
JPanel panel = new JPanel(new GridLayout(1,0));
panel.add(new JLabel(new ImageIcon(src)));
panel.add(new JLabel(new ImageIcon(image1)));
panel.add(new JLabel(new ImageIcon(image2)));
return panel;
}
private BufferedImage copy(BufferedImage in) throws IOException {
int w = in.getWidth();
int h = in.getHeight();
int type = BufferedImage.TYPE_INT_ARGB;// problem in native apps
//BufferedImage.TYPE_INT_RGB; // this one works okay
BufferedImage out = new BufferedImage(w, h, type);
for(int y = 0; y < h; y++) {
for(int x = 0; x < w; x++) {
out.setRGB(x, y, in.getRGB(x, y));
}
}
File fileTwo = new File("fileTwo.jpg");
ImageIO.write(out, "jpg", fileTwo);
return ImageIO.read(fileTwo);
}
public static void main(String[] args) throws IOException {
BufferedImage image = ImageIO.read(new File("images/cougar.jpg"));
WriteTest test = new WriteTest();
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.getContentPane().add(test.getContent(image));
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
}
