ImageResize

ImageResize.groovy

import javax.swing.ImageIcon

import java.awt.Color
import java.awt.image.BufferedImage
import java.awt.image.ColorModel
import java.awt.image.WritableRaster

import java.awt.Graphics2D
import javax.imageio.*
import java.awt.*
import java.awt.geom.*

def resize(f,s ){
  BufferedImage srcBufImage = ImageIO.read(new FileInputStream(f)); 
	
	BufferedImage bufTarget = null;
	
	int width, height
	float u
	if(srcBufImage.getWidth() > srcBufImage.getHeight()){
		u = s / srcBufImage.getWidth()
	}
	else{
		u = s / srcBufImage.getHeight()
	}
	width  = u * srcBufImage.getWidth()
	height = u * srcBufImage.getHeight()

	double sx = (double) width / srcBufImage.getWidth()
	double sy = (double) height / srcBufImage.getHeight()

	int type = srcBufImage.getType();
	if(type == BufferedImage.TYPE_CUSTOM){
		ColorModel cm = srcBufImage.getColorModel()
		WritableRaster raster = cm.createCompatibleWritableRaster(width,height)
		boolean alphaPremultiplied = cm.isAlphaPremultiplied()
		bufTarget = new BufferedImage(cm, raster, alphaPremultiplied, null)
	}else
		bufTarget = new BufferedImage(width, height, type)

	Graphics2D g = bufTarget.createGraphics()
	g.setRenderingHint(RenderingHints.KEY_RENDERING,
			RenderingHints.VALUE_RENDER_QUALITY)
	g.drawRenderedImage(srcBufImage, AffineTransform.getScaleInstance(sx, sy))
	g.dispose()
	return bufTarget
}