Create image thumbnail in java using ImageJ API

For more information on how to implement Photos sharing website using Java, Spring, Tomcat, Imagej download Fotovault (opensource Photo sharing project) Fotovault - Photo Sharing Project

Below is the code example to create thumbnails in Java.

Download ImageJ jar from

http://rsbweb.nih.gov/ij/download.html

and include it in your classpath.

The below code example proportionately/evenly crops the image to make the image a perfect square and creates a thumbnail of 100 X 100 pixels.
cropAndResize method takes the fileAbsolutePath and Save as image suffix (thumbnail name suffix).

	private String cropAndResize(String fileAbsolutePath, String fileSaveAsNameSuffix) {
	try {
	Opener opener = new Opener();
	ImagePlus imp = opener.openImage(fileAbsolutePath);
	ImageProcessor ip = imp.getProcessor();
	StackProcessor sp = new StackProcessor(imp.getStack(), ip);
	int width = imp.getWidth();
	int height = imp.getHeight();
	int cropWidth = 0;
	int cropHeight = 0;
	if(width > height) {
	cropWidth = height;
	cropHeight = height;
	} else {
	cropWidth = width;
	cropHeight = width;
	}
	int x = -1;
	int y = -1;
	if(width == height) {
	x = 0;
	y = 0;
	} else if(width > height) {
	x = (width - height) / 2;
	y=0;
	} else if (width < height) {
	x = 0;
	y = (height - width) / 2;
	}
	logger.debug(imp.getWidth());
	logger.debug(imp.getHeight());
	logger.debug("cropWidth " + cropWidth);
	logger.debug("cropHeight" + cropHeight);
	ImageStack croppedStack = sp.crop(x, y, cropWidth, cropHeight);
	imp.setStack(null, croppedStack);
	logger.debug(imp.getWidth());
	logger.debug(imp.getHeight());
	sp = new StackProcessor(imp.getStack(), imp.getProcessor());
	ImageStack resizedStack = sp.resize(100, 100, true);
	imp.setStack(null, resizedStack);
	StringBuffer filePath = new StringBuffer(fileAbsolutePath);
	filePath.replace(filePath.lastIndexOf("."),
	filePath.lastIndexOf("."), fileSaveAsNameSuffix);
	String saveAsFilePath = filePath.toString();
	IJ.save(imp, saveAsFilePath);
	return saveAsFilePath;
	} catch (Exception e) {
	logger.error("Error while resizing Image.");
	e.printStackTrace();
	return null;
	}
	}

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