import javax.imageio.*;
import groovy.swing.j2d.*
img = ImageIO.read(new File("sf.jpg"))
w = img.getWidth()
h = img.getHeight()
gr = new GraphicsRenderer()
gr.renderToFile("sample1008a.png", w, h){
 antialias 'on'
 rect( x: 0, y: 0, width: w, height: h,
   borderColor: no){
   texturePaint(x: 0, y: 0, image: img )
   filters {
     lights {
       pointLight(azimuth: 90/180f*Math.PI,
         elevation: 0.4,
         intensity: 0.7,
         color: 'yellow',
         centreX:0.8, centreY:0.1)
     }
   }
 }
}
出力画像(sample1008a.png)

動作環境
Groovy1.6.0, JDK1.6 Update12
 
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