How to resize an image in Java ?

I’m not the expert in Java image processing, but a chance given to implement this re-sized feature in user image upload form, which request re-sized the large image to a smaller size with fixed width and height.

Graphics2D is providing the image re-size feature as follows :

BufferedImage resizedImage = new BufferedImage(IMG_WIDTH, IMG_HEIGHT, type);
Graphics2D g = resizedImage.createGraphics();
g.drawImage(originalImage, 0, 0, IMG_WIDTH, IMG_HEIGHT, null);
g.dispose();

According to some articles, if you want to increase the re-sized image quality, you can add the RenderingHints as follows :

BufferedImage resizedImage = new BufferedImage(IMG_WIDTH, IMG_HEIGHT, type);
Graphics2D g = resizedImage.createGraphics();
g.drawImage(originalImage, 0, 0, IMG_WIDTH, IMG_HEIGHT, null);
g.dispose();
g.setComposite(AlphaComposite.Src);
g.setRenderingHint(RenderingHints.KEY_INTERPOLATION,RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g.setRenderingHint(RenderingHints.KEY_RENDERING,RenderingHints.VALUE_RENDER_QUALITY);
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);

1. Example

Here is a website snapshot, the following program will re-size this image to a fixed width and height image (100 x 100).

mkyong.jpg (640 x 310) – 46KB

2. Source code

ImageTest.java

import java.awt.AlphaComposite;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
 
/*
 * @author mkyong
 *
 */
public class ImageTest {
 
	private static final int IMG_WIDTH = 100;
	private static final int IMG_HEIGHT = 100;
 
	public static void main(String [] args){
 
	try{
 
		BufferedImage originalImage = ImageIO.read(new File("c:\\image\\mkyong.jpg"));
		int type = originalImage.getType() == 0? BufferedImage.TYPE_INT_ARGB : originalImage.getType();
 
		BufferedImage resizeImageJpg = resizeImage(originalImage, type);
		ImageIO.write(resizeImageJpg, "jpg", new File("c:\\image\\mkyong_jpg.jpg")); 
 
		BufferedImage resizeImagePng = resizeImage(originalImage, type);
		ImageIO.write(resizeImagePng, "png", new File("c:\\image\\mkyong_png.jpg")); 
 
		BufferedImage resizeImageHintJpg = resizeImageWithHint(originalImage, type);
		ImageIO.write(resizeImageHintJpg, "jpg", new File("c:\\image\\mkyong_hint_jpg.jpg")); 
 
		BufferedImage resizeImageHintPng = resizeImageWithHint(originalImage, type);
		ImageIO.write(resizeImageHintPng, "png", new File("c:\\image\\mkyong_hint_png.jpg")); 
 
	}catch(IOException e){
		System.out.println(e.getMessage());
	}
 
    }
 
    private static BufferedImage resizeImage(BufferedImage originalImage, int type){
	BufferedImage resizedImage = new BufferedImage(IMG_WIDTH, IMG_HEIGHT, type);
	Graphics2D g = resizedImage.createGraphics();
	g.drawImage(originalImage, 0, 0, IMG_WIDTH, IMG_HEIGHT, null);
	g.dispose();
 
	return resizedImage;
    }
 
    private static BufferedImage resizeImageWithHint(BufferedImage originalImage, int type){
 
	BufferedImage resizedImage = new BufferedImage(IMG_WIDTH, IMG_HEIGHT, type);
	Graphics2D g = resizedImage.createGraphics();
	g.drawImage(originalImage, 0, 0, IMG_WIDTH, IMG_HEIGHT, null);
	g.dispose();	
	g.setComposite(AlphaComposite.Src);
 
	g.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
	RenderingHints.VALUE_INTERPOLATION_BILINEAR);
	g.setRenderingHint(RenderingHints.KEY_RENDERING,
	RenderingHints.VALUE_RENDER_QUALITY);
	g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
	RenderingHints.VALUE_ANTIALIAS_ON);
 
	return resizedImage;
    }	
}

See result :

JPG (4KB)	PNG (9KB)	JPG + Hints (4KB)	PNG + Hints (9KB)

Conclusion

As you see the re-sized image , the file size of the re-sized PNG image is larger than the re-sized JPEG image, but the PNG quality is better than JPG after re-sized. The hints will not take any effect in JPG format, however i didn’t see any difference between PNG and PNG + hints either, even someone told about adding the rendering hints will increase the image quality?

P.S Please share Java image tips if you know some :)

References

mkyong

Founder of Mkyong.com, love Java and open source stuffs. Follow him on Twitter, or befriend him on Facebook or Google Plus.

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public static BufferedImage resizeImage(BufferedImage image, int longer, int width, int height, boolean isWithHint) { int oldWidth = image.getWidth(); int oldHeight = image.getHeight(); boolean isWidthLonger = oldWidth > oldHeight; int newWidth = -1; int newHeight = -1; if (longer > 0) { if (isWidthLonger) { newWidth = longer; newHeight = NumberUtil.convert(new double[] { longer * ((double) oldHeight / (double) oldWidth) })[0] .intValue(); } else { newHeight = longer; newWidth = NumberUtil.convert(new double[] { longer * ((double) oldWidth / (double) oldHeight) })[0] .intValue(); } } else { newWidth = width; newHeight = height; } int type = image.getType() == 0? BufferedImage.TYPE_INT_ARGB : image.getType(); return isWithHint ? resizeImageWithHint(image, type, newWidth, newHeight) : resizeImageWithoutHint(image, type, newWidth, newHeight); }

Semika November 18, 2012 at 2:17 pm
Thank you so much.
Pankaj November 8, 2012 at 6:00 am
Actually using RenderingHints do affect the output image quality and size. I have written a similar program and played with it for sometime to check it out. In your case the image is of website and quality is not too good to recognize the difference from naked eye. Check it out here:
http://www.journaldev.com/615/java-image-resize-program-using-graphics2d-example
Abdul Rehman October 23, 2012 at 1:44 pm
Hi!
I have an implementation to resize an image with rendering hints and converting it to TYPE_BYTE_GRAY. Code works fine until i get an original image having type of TYPE_BYTE_BINARY. Let’s say if i do not convert it to TYPE_BYTE_GRAY but only want to resize it. How am i gonna do that? I have tried it against drawImage(img, 0, 0, null) and drawImage(img, 0, 0, newWidth, newHeight, null) but was not successful. In first case the image gets cropped and in second case it throws exception. So what i want to ask is, Is there any way to resize TYPE_BYTE_BINARY image to customized width and height? Thank you
Anand Singh October 18, 2012 at 7:24 pm
its giving exceptin
java.lang.IllegalArgumentException: Can’t load standard profile: sRGB.pf

Bruce Wen October 14, 2012 at 11:06 am

	public static BufferedImage resizeImage(BufferedImage image, int longer, int width,
			int height, boolean isWithHint) {
		int oldWidth = image.getWidth();
		int oldHeight = image.getHeight();
 
		boolean isWidthLonger = oldWidth &gt; oldHeight;
 
		int newWidth = -1;
		int newHeight = -1;
 
		if (longer &gt; 0) {
			if (isWidthLonger) {
				newWidth = longer;
				newHeight = NumberUtil.convert(new double[] { longer
						* ((double) oldHeight / (double) oldWidth) })[0]
						.intValue();
			} else {
				newHeight = longer;
				newWidth = NumberUtil.convert(new double[] { longer
						* ((double) oldWidth / (double) oldHeight) })[0]
						.intValue();
			}
		} else {
			newWidth = width;
			newHeight = height;
		}
 
		int type = image.getType() == 0? BufferedImage.TYPE_INT_ARGB : image.getType();
 
		return isWithHint ? resizeImageWithHint(image, type,
				newWidth, newHeight) : resizeImageWithoutHint(image,
						type, newWidth, newHeight);
	}

Arjun October 4, 2012 at 1:13 pm
Thanks a ton, was stuck on this topic for days before i found your post.
Keep up the good work..
Arjun
Claudio June 22, 2012 at 10:26 am
grooooooooooosooooooooooooooooooooo me solucionaste la vida chabonnnnn!!!
Jiten K June 16, 2012 at 4:42 am
Great example!!! thanks Mkyong!!! You are great!!!
JSupport February 27, 2012 at 12:43 pm
Check out this
How to Resize Image according to the screen size using Java
How to resize an image in Java
Misgana February 11, 2012 at 9:21 pm
Nice short and precise.Thanks a lot.
Nghia Nguyen November 9, 2011 at 10:30 am
Great example!!!
Spidey September 6, 2011 at 1:36 pm
This made my Icons lose their transparency, any idea why?
Hugo Garcia-Cotte June 14, 2011 at 3:53 pm
There is a little error in your code, the rendering hints have to be given before you use the drawImage method on g.
And then you can see the rendering is better.
- lolka May 12, 2013 at 4:58 am
  +1
  or this is some trick, but i suppose rendering hits must be set BEFORE drawing an image
Ram June 7, 2011 at 8:35 pm
Hi Dude,
Very nice Example for Sacling the buffred Image …
Thanks ,
Ram
noha mohamed April 18, 2011 at 10:39 pm
it is a good work .. :)
Olcay Erta? March 27, 2011 at 8:02 pm
Thank you very much. It was really helpful.
Linda Hernandez January 16, 2011 at 9:08 am
This is the really good and perfect discussion as well with no doubt this is the best approach.
Alkhawar December 2, 2010 at 6:53 am
Thanks Dear for posting such a nice post.
Morten Nobel-Jørgensen September 21, 2010 at 7:29 pm
You should also consider using java-image-scaling library, this gives a better and faster implementation of image scaling:
http://code.google.com/p/java-image-scaling/
- Morten
- mkyong September 24, 2010 at 9:15 am
  Thanks for sharing, will play around with it.
mkyong October 4, 2009 at 12:37 pm
Thanks for the contribution, really appreciated it.
Dan Smith October 3, 2009 at 2:01 am
Check out http://today.java.net/pub/a/today/2007/04/03/perils-of-image-getscaledinstance.html and http://www.componenthouse.com/article-20
Daniel Manzke September 30, 2009 at 12:35 pm
Hi,
I think you have set the Hints before drawing, so they will be recognized and you should use the method for g.addHints(..), so you can give them all. In your way I think you will be overwritten every time using the set-Method.
Last but not least you should add some kind of calculation for the image size, because often your picture won’t be 100×100. Often they will be something like 100×67 or so.
So you could calculate which is the greatest length, scale that down to your size you want to have and then use this scale factor to calculate the other length.
Hope this helps a little bit. If you write me an email. ;)
Bye,
Daniel

How to resize an image in Java ?

1. Example

2. Source code

Conclusion

References

Popular Posts

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1. Example

2. Source code

Conclusion

References

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