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algorithm for resizing an image

Posted on 2004-04-02
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Last Modified: 2007-12-19
hi

I am doing a project this year that requires to develop a program that will read an scanned image and resize it.

Upto now I have been able to extract the RGB values for each pixel in the picture using the PixelGrabber class in java but I do not know how to manipulate these values while resizing them.

The project needs to convert all scanned images to a predefined size. For example, images of size 800*600 and 200*185, both are to be converted to size 300*300.

I need the algorithm that will do my work.
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Question by:shah1d1698
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by:Mayank S
Mayank S earned 50 total points
ID: 10741390
Maybe you can try shearing:

http://www.javaalmanac.com/egs/java.awt.image/CreateTxImage.html

Also have a look at the "Related Examples".
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by:Kavar
ID: 10741403
there are several methods, they break down to drop or blend, which are you wanting?
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NovaDenizen earned 200 total points
ID: 10784359
Here's a way to do it without getting your hands dirty with individual pixels.

Image oldImage; // this is the original image you need to initialize

Image newImage = comp.createImage(300,300); // comp is some instance of java.awt.Component you have laying around
g = i.getGraphics();  // Image.getGraphics() only works on images you get from Component.createImage()
g.drawImage(oldImage, 0, 0, 300, 300, null); // you might not be able to get away with null here
g.dispose();

Now, newImage is a 300x300 version of oldImage.

If instead you're looking to do you own pixel-by-pixel resizing, you need to look into 'resampling'.  A good paper to look at is "A pixel is not a little square" at ftp://ftp.alvyray.com/Acrobat/6_Pixel.pdf.
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