Resize a picture to fit a JLabel

Question

I m trying to make a picture fit a JLabel   I wish to reduce the picture dimensions to something more appropriate for my Swing JPanel    I tried with setPreferredSize but it doesn t work   I m wondering if there is a simple way to do it  Should I scale the image for this purpose

User · Answer

You can try it   ImageIcon imageIcon   new ImageIcon new ImageIcon  icon png   getImage   getScaledInstance 20  20  Image SCALE DEFAULT    label setIcon imageIcon     Or in one line   label setIcon new ImageIcon new ImageIcon  icon png   getImage   getScaledInstance 20  20  Image SCALE DEFAULT       The execution time is much more faster than File and ImageIO   I recommend you to compare the two solutions in a loop

User · Answer

The best and easy way for image resize using Java Swing is   jLabel setIcon new ImageIcon new javax swing ImageIcon getClass   getResource   res image png    getImage   getScaledInstance 200  50  Image SCALE SMOOTH       For better display  identify the actual height  amp  width of image and resize based on width height percentage

User · Answer

Assign your image to a string  Eg image Now set icon to a fixed size label  image setIcon new javax swing ImageIcon image getScaledInstance 50 50 WIDTH

User · Answer

i have done the following and it worked perfectly  try           JFileChooser jfc   new JFileChooser            jfc showOpenDialog null           File f   jfc getSelectedFile            Image bi   ImageIO read f           image1 setText              image1 setIcon new ImageIcon bi getScaledInstance int width  int width  int width            catch  Exception e

User · Answer

public void selectImageAndResize            int returnVal   jFileChooser showOpenDialog this     open jfilechooser     if  returnVal    jFileChooser APPROVE OPTION         select image         File file   jFileChooser getSelectedFile         get the image         BufferedImage bi          try                                transforms selected file to buffer                            bi ImageIO read file                 ImageIcon iconimage   new ImageIcon bi                                 get image dimensions                            BufferedImage bi2   new BufferedImage iconimage getIconWidth    iconimage getIconHeight    BufferedImage TYPE INT ARGB                Graphics g   bi createGraphics                iconimage paintIcon null  g  0 0               g dispose                                  resize image according to jlabel                            BufferedImage resizedimage resize bi jLabel2 getWidth    jLabel2 getHeight                  ImageIcon resizedicon new ImageIcon resizedimage               jLabel2 setIcon resizedicon             catch  Exception ex                System out println  problem accessing file  file getAbsolutePath                         else           System out println  File access cancelled by user

User · Answer

public static void main String s              BufferedImage image   null      try                image   ImageIO read new File  your image path            catch  Exception e                 e printStackTrace               ImageIcon imageIcon   new ImageIcon fitimage image  label getWidth    label getHeight          jLabel1 setIcon imageIcon       private Image fitimage Image img   int w   int h        BufferedImage resizedimage   new BufferedImage w h BufferedImage TYPE INT RGB       Graphics2D g2   resizedimage createGraphics        g2 setRenderingHint RenderingHints KEY INTERPOLATION  RenderingHints VALUE INTERPOLATION BILINEAR       g2 drawImage img  0  0 w h null       g2 dispose        return resizedimage

User · Answer

Or u can do it this way  The function u put the below 6 lines will throw an IOException  And will take your JLabel as a parameter   BufferedImage bi new BufferedImage label width   label height   BufferedImage TYPE INT RGB    Graphics2D g bi createGraphics     Image img ImageIO read new File  path of your image      g drawImage img  0  0  label width    label height    null    g dispose     return bi

User · Answer

Outline  Here are the steps to follow    Read the picture as a BufferedImage  Resize the BufferedImage to another BufferedImage that s the size of the JLabel  Create an ImageIcon from the resized BufferedImage    You do not have to set the preferred size of the JLabel   Once you ve scaled the image to the size you want  the JLabel will take the size of the ImageIcon   Read the picture as a BufferedImage  BufferedImage img   null  try       img   ImageIO read new File  strawberry jpg       catch  IOException e        e printStackTrace        Resize the BufferedImage  Image dimg   img getScaledInstance label getWidth    label getHeight            Image SCALE SMOOTH     Make sure that the label width and height are the same proportions as the original image width and height   In other words  if the picture is 600 x 900 pixels  scale to 100 X 150   Otherwise  your picture will be distorted   Create an ImageIcon  ImageIcon imageIcon   new ImageIcon dimg

[java] Resize a picture to fit a JLabel

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