How to resize JLabel ImageIcon

Question

I m making a Java Swing application that has the following layout  MigLayout     icon  icon  icon        where icon   jlabel and the user can add more icons   When the user adds or removes icons  the others should shrink or grow   My question is really straightforward  I have a JLabel which contains an ImageIcon  how can I resize this icon

User · Answer

This will keep the right aspect ratio       public ImageIcon scaleImage ImageIcon icon  int w  int h                int nw   icon getIconWidth            int nh   icon getIconHeight             if icon getIconWidth    gt  w                      nw   w            nh    nw   icon getIconHeight      icon getIconWidth                       if nh  gt  h                      nh   h            nw    icon getIconWidth     nh    icon getIconHeight                       return new ImageIcon icon getImage   getScaledInstance nw  nh  Image SCALE DEFAULT

User · Answer

And what about it    ImageIcon imageIcon   new ImageIcon new ImageIcon  icon png   getImage   getScaledInstance 20  20  Image SCALE DEFAULT    label setIcon imageIcon     From  Resize a picture to fit a JLabel

User · Answer

I agree this code works  to size an ImageIcon from a file for display while keeping the aspect ratio I have used the below         source File of image  maxHeight pixels of height available  maxWidth pixels of width available     return an ImageIcon for adding to a label       public ImageIcon rescaleImage File source int maxHeight  int maxWidth        int newHeight   0  newWidth   0            Variables for the new height and width     int priorHeight   0  priorWidth   0      BufferedImage image   null      ImageIcon sizeImage       try               image   ImageIO read source             get the image       catch  Exception e                 e printStackTrace                System out println  Picture upload attempted  amp  failed               sizeImage   new ImageIcon image        if sizeImage    null                priorHeight   sizeImage getIconHeight             priorWidth   sizeImage getIconWidth                  Calculate the correct new height and width     if  float priorHeight  float priorWidth  gt   float maxHeight  float maxWidth                newHeight   maxHeight          newWidth    int    float priorWidth  float priorHeight   float newHeight             else                newWidth   maxWidth          newHeight    int    float priorHeight  float priorWidth   float newWidth                  Resize the image         1  Create a new Buffered Image and Graphic2D object     BufferedImage resizedImg   new BufferedImage newWidth  newHeight  BufferedImage TYPE INT RGB       Graphics2D g2   resizedImg createGraphics            2  Use the Graphic object to draw a new image to the image in the buffer     g2 setRenderingHint RenderingHints KEY INTERPOLATION  RenderingHints VALUE INTERPOLATION BILINEAR       g2 drawImage image  0  0  newWidth  newHeight  null       g2 dispose            3  Convert the buffered image into an ImageIcon for return     return  new ImageIcon resizedImg

User · Answer

Resizing the icon is not straightforward  You need to use Java s graphics 2D to scale the image  The first parameter is a Image class which you can easily get from ImageIcon class  You can use ImageIcon class to load your image file and then simply call getter method to get the image   private Image getScaledImage Image srcImg  int w  int h       BufferedImage resizedImg   new BufferedImage w  h  BufferedImage TYPE INT ARGB       Graphics2D g2   resizedImg createGraphics         g2 setRenderingHint RenderingHints KEY INTERPOLATION  RenderingHints VALUE INTERPOLATION BILINEAR       g2 drawImage srcImg  0  0  w  h  null       g2 dispose         return resizedImg

User · Answer

One  quick  amp  dirty  way to resize images it to use HTML  amp  specify the new size in the image element   This even works for animated images with transparency

User · Answer

Try this    ImageIcon imageIcon   new ImageIcon    img imageName png       load the image to a imageIcon Image image   imageIcon getImage       transform it  Image newimg   image getScaledInstance 120  120   java awt Image SCALE SMOOTH      scale it the smooth way   imageIcon   new ImageIcon newimg       transform it back    found it here

[java] How to resize JLabel ImageIcon?

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