Can I change the resolution of a jpg image in Java?

Question

I have some .jpg's that I'm displaying in a panel. Unfortunately they're all about 1500x1125 pixels, which is way too big for what I'm going for. Is there a programmatic way to change the resolution of these .jpg's?

Check this out http://www.mkyong.com/java/how-to-resize-an-image-in-java/ — toniedzwiedz, Jul 19 '12 at 14:46
@Tom, that worked perfectly, thank you very much! Make it an answer and you've got yourself a check mark. — Quintis555, Jul 19 '12 at 14:56

score 5 · Accepted Answer · answered Jul 19 '12 at 15:00

5

You can scale an image using Graphics2D methods (from java.awt). This tutorial at mkyong.com explains it in depth.

answered Jul 19 '12 at 15:00

toniedzwiedz

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Jonathan Payne · Answer 2 · 2012-07-19T15:25:02.850

3

Load it as an ImageIcon and this'll do the trick:

import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import javax.swing.ImageIcon;

public static ImageIcon resizeImageIcon( ImageIcon imageIcon , Integer width , Integer height )
{
    BufferedImage bufferedImage = new BufferedImage( width , height , BufferedImage.TRANSLUCENT );

    Graphics2D graphics2D = bufferedImage.createGraphics();
    graphics2D.drawImage( imageIcon.getImage() , 0 , 0 , width , height , null );
    graphics2D.dispose();

    return new ImageIcon( bufferedImage , imageIcon.getDescription() );
}

edited Jul 19 '12 at 15:25

answered Jul 19 '12 at 14:49

Jonathan Payne

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Oh man, I WAS going to check tom off as an answer, but I AM already using ImageIcon, so this might be more what I need. STAND BY FOR FUTURE EXCITING UPDATES! – Quintis555 Jul 19 '12 at 15:08
I'm getting an "error: cannot find symbol" on this line BufferedImage bufferedImage = new BufferedImage( width , height , BufferedImage.TRANSLUCENT); It points to the BufferedImage part in the build output window. – Quintis555 Jul 19 '12 at 15:15
I'm not sure, it compiles fine on mine. What IDE are you using? – Jonathan Payne Jul 19 '12 at 15:21
JCreator LE. Is there some import I'm missing? – Quintis555 Jul 19 '12 at 15:23
I added the imports to the answer. – Jonathan Payne Jul 19 '12 at 15:25
Great. Not getting build errors anymore! But... it's not doing anything. I need to make sure I'm doing this right... I set the ImageIcon line: 'ImageIcon icon = new ImageIcon("...\\J02406-TOP.jpg");' Then call resizeImageIcon? 'resizeImageIcon(icon, 500, 400);' – Quintis555 Jul 19 '12 at 15:32

score 1 · Answer 3 · edited Jan 29 '14 at 10:26

you can try:

private BufferedImage getScaledImage(Image srcImg, int w, int h) {
    BufferedImage resizedImg = new BufferedImage(w, h, Transparency.TRANSLUCENT);
    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;
}

Can I change the resolution of a jpg image in Java?

3 Answers3

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