Re: Work around requested

Knute Johnson <>
Tue, 20 Dec 2011 20:47:35 -0800
On 12/20/2011 5:33 PM, bH wrote:

On Dec 20, 8:13 pm, "John B. Matthews"<nos...@nospam.invalid> wrote:

In article

  bH<> wrote:

I compared the output using one large image
1600 x 1200 pixels cropped to 200 x 150 in both
programs, first program uses:
and the second program with the revision as suggested
above by John Matthews:
uses the classes javax.imageio.ImageIO and

The comparison result is that the suggested
revision by John Matthews comes in second place.
It does do crop it, but is less perfect of a
crop than the first method listed.
For instance in the second program,
the image is not as sharp and clear.

Kudos for comparing. What interpolationType did you use?

<>- Hide quoted text -

- Show quoted text -

After you read my code,as usual
happens here, I'll have to take all criticism
that I deserve. I hope that I have limited my
line lengths to enable to fit it in.

Hi Knute,
I have combined your work dated 12-31-2005
found in this link:
< //

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

public class DataScaleImageThmbNail extends JFrame
   implements ActionListener {

   private JButton dataTransferBtn =
     new JButton("Make Thumbnail");
   private JButton closeBtn = new JButton("Close");
   private JPanel infoPanel = new JPanel();

   JLabel NameOrNumberLabel =
     new JLabel (" Enter Image Name or Number" );
   JLabel ThmbNailWidth =
     new JLabel (" Enter Width for Thumbnail" );
   JLabel ThmbNailHeight =
     new JLabel (" Enter Height for Thumbnail" );

   JTextField namOrNum = new JTextField("EnterDataHere",10);
   JTextField tfThumbNailWidth = new JTextField("200",10);
   JTextField tfThumbNailHeight = new JTextField("150",10);
   String alfaNumeric =" ";
   String stringWidth = " ";
   String stringHeight = " ";

   DataScaleImageThmbNail() {


     JPanel infoPanel= new JPanel();

     // TextArea for directions
     infoPanel.add(new JTextArea(content));

     // TextField for name of image
     infoPanel.add(NameOrNumberLabel );
     namOrNum = new JTextField("12A", 12);
     infoPanel.add( namOrNum );

     // TextField for width of thumbnail
     infoPanel.add (tfThumbNailWidth);

     // TextField for height of thumbnail
     infoPanel.add (tfThumbNailHeight);

     infoPanel.add(dataTransferBtn );


     Container contentPane= getContentPane();


   static String content =
     "Please place 2 folders on the desktop. \n"
     + " Name one 'LargeImageFolder' to put your large .jpg into it.
     + " then the second folder name it 'ThmnailFolder'. \n"
     + " Caution, each .jpg should have a unique 'name' \n"
     + " as examples '031', 'Bob2. \n"
     + " Make only one thumbnail at a time. \n"
     + " For each one, click the 'Make Thumbnail' button. \n"
     + " The .jpg thumbnails have the same name\n"
     + " as the original .jpg \n"
     + " You will find them in 'ThmnailFolder' \n"
     + " A 'Close' button is provided to close the program.";

   public void actionPerformed(ActionEvent e) {

     if(e.getSource() == dataTransferBtn){
       alfaNumeric = namOrNum.getText();

       stringWidth = tfThumbNailWidth.getText();
      // System.out.println(stringWidth);

       stringHeight = tfThumbNailHeight.getText();
      // System.out.println(stringHeight );
       ScaleImage2x (alfaNumeric, stringWidth, stringHeight ) ;
     if(e.getSource() == closeBtn){


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

   public void ScaleImage2x (String alnumeric,
       String stringWidth,String stringHeight) {

     String srcFile= "C:/Users/Bob/Desktop/LargeImageFolder/"
       + alnumeric+ ".jpg";
     String destFile= "C:/Users/Bob/Desktop/ThmnailFolder/"
       + alnumeric+ ".jpg";

     int destWidth = Integer.parseInt(stringWidth);
     int destHeight = Integer.parseInt(stringHeight);

     try {
       BufferedImage src = File(srcFile));

       BufferedImage dest = new BufferedImage(destWidth,destHeight,
       Graphics2D g = dest.createGraphics();
       AffineTransform at = AffineTransform.getScaleInstance(
       ImageIO.write(dest,"JPG",new File(destFile));
     catch (Exception e)
       e.printStackTrace( System.out ) ;


I've learned some things since then :-). See the docs for
AffineTransformOP. I've found on many occasions that when the images
look bad after some Op that they need to be converted to compatible
images (matching color space).

     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);


Knute Johnson

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