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Updated Mar 22, 2009 by m...@nobel-joergensen.com
Labels:	Featured, Phase-Implementation

Getting_started

A simple introduction

Introduction

This will guide you through how to rescale images using this library.

A simple rescale

Lets say that you have a BufferedImage instance called tomato that should be rescaled to 100x200. If you want a high quality rescale, you should choose the ResampleOp class:

 ResampleOp  resampleOp = new ResampleOp (100,200);
 BufferedImage rescaledTomato = resampleOp.filter(tomato, null);

Tip: You might need to increase your maximum heap. This can be done using the -Xmx parameter, such as: java -Xmx512m MyJavaClass

Using Unsharpen Filter

Let's improve the quality a bit more adding a unsharpen filter to the final image. This will remove some of blur, that a rescale operation creates.

 ResampleOp  resampleOp = new ResampleOp (100,200);
 resampleOp.setUnsharpenMask(AdvancedResizeOp.UnsharpenMask.Normal);
 BufferedImage rescaledTomato = resampleOp.filter(tomato, null);

Adding a listener

If your tomato image was very large, this might take some time. The following code add a change listener so the user can see that the computer is actually is working.

 ResampleOp  resampleOp = new ResampleOp (100,200);
 resampleOp.setUnsharpenMask(AdvancedResizeOp.UnsharpenMask.Normal);
 resampleOp.addProgressListener(new ProgressListener() {
   public void notifyProgress(float fraction) {
     System.out.printf("Still working - %f percent %n",fraction*100);
   }
 });
 BufferedImage rescaledTomato = resampleOp.filter(tomato, null);