Re: Work around requested

Knute Johnson <>
Wed, 21 Dec 2011 19:09:59 -0800
On 12/21/2011 6:58 PM, bH wrote:

On Dec 21, 7:09 pm, Knute Johnson<> wrote:

On 12/21/2011 1:58 PM, bH wrote:

Hi Knute,
I am in need of further help as to how and
where to place what you wrote above.
I have tried various locations within my work.
Nothing seems to help to make the resulting
thumbnail show any improvement.

import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.awt.geom.*;
import javax.imageio.*;
import javax.swing.*;

public class test extends JPanel implements ActionListener {
      private final JFrame frame;
      private final RenderingHints hints;
      private BufferedImage image,thumb1,thumb2;

      public test(JFrame frame) {
          this.frame = frame;

          hints = new RenderingHints(
          hints.add(new RenderingHints(
          hints.add(new RenderingHints(

          try {
              URL url =
               new URL("");
              image =;
               new Dimension(image.getWidth(),image.getHeight()));

              thumb1 = scaleImage(image,.25,.25,
              thumb2 = scaleImage(image,.25,.25,hints);

              // if the image needs to have the colorspace converted
              // image = convertToCompatible(image);
          } catch (MalformedURLException murle) {
          } catch (IOException ioe) {

      public void actionPerformed(ActionEvent ae) {
          String ac = ae.getActionCommand();
          if (ac.equals("url")) {
              String input =
               JOptionPane.showInputDialog(this,"Enter Image URL");
              if (!input.equals("")) {
                  try {
                      URL url = new URL(input);
                      image =;
                       new Dimension(image.getWidth(),image.getHeight()));

                      thumb1 = scaleImage(image,.25,.25,
                      thumb2 = scaleImage(image,.25,.25,hints);

                      setPreferredSize(new Dimension(image.getWidth(),
                  } catch (MalformedURLException murle) {
                  } catch (IOException ioe) {

      public void paintComponent(Graphics g) {

      public static BufferedImage scaleImage(BufferedImage src, double sx,
       double sy, int interpolationType) {
          AffineTransformOp op = new AffineTransformOp(
          return op.filter(src,null);

      public static BufferedImage scaleImage(BufferedImage src, double sx,
       double sy, RenderingHints hints) {
          AffineTransformOp op = new AffineTransformOp(
          return op.filter(src,null);

      public static BufferedImage convertToCompatible(BufferedImage image) {
          GraphicsEnvironment ge =
          GraphicsDevice gd = ge.getDefaultScreenDevice();
          GraphicsConfiguration gc = gd.getDefaultConfiguration();

          BufferedImage compatible =

          if (compatible.getType() == image.getType())
              return image;

          ColorConvertOp op = new ColorConvertOp(

          return op.filter(image,compatible);

      public static void main(String[] args) {
          EventQueue.invokeLater(new Runnable() {
              public void run() {
                  JFrame f = new JFrame();

                  test t = new test(f);

                  JMenuBar mb = new JMenuBar();
                  JMenu file = new JMenu("file");
                  JMenuItem url = new JMenuItem("url");




Knute Johnson

Hi Knute,
Thanks for your help. I have
experimented with your program and
find that the thumbnail images have no
noticeable distortion.

The first time I ran "",
using your image from your URL
I thought the small planet drawings in the
upper corners were a part of the initial download
URL source. I should have read your ""
more carefully.

However, when I replaced your URL, with my
localhost url, I then saw where the thumbnails
are placed.

Finally it was also clear in ""
what you intended me to write from your earlier

Thank you very much.


You are very welcome.


Knute Johnson

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