groovyで画像の端をぼかす

groovyで画像の端をぼかすには、以下のコードを実行します。

@Grab(group='com.jhlabs', module='filters', version='2.0.235')
import java.io.*
import java.awt.*
import java.awt.geom.*
import java.awt.image.*
import javax.imageio.*
import com.jhlabs.composite.*
import com.jhlabs.image.*

// 画像の端をぼかす
def img = ImageIO.read(new File("sf2.jpg"))
def wr = img.getRaster()
def img2 = new BufferedImage(
  img.getWidth(), img.getHeight(), BufferedImage.TYPE_INT_ARGB
)
def wr2 = img2.getRaster()

def buf = new int[wr.getNumDataElements()]
def buf2 = new int[4]

for(int ly=0;ly<wr.getHeight();ly++){
  for(int lx=0;lx<wr.getWidth();lx++){
    wr.getPixel(lx, ly, buf)
    buf2[0] = buf[0]
    buf2[1] = buf[1]
    buf2[2] = buf[2]
    buf2[3] = Math.min(
      Math.sin(Math.PI*lx/img.getWidth())*255,
      Math.sin(Math.PI*ly/img.getHeight())*255
    )
    wr2.setPixel(lx, ly, buf2)
  }
}
def gf = new GaussianFilter()
gf.setRadius(5f)
img = gf.filter(img, null)

def gr = img.createGraphics()
gr.setComposite(
  AlphaComposite.getInstance(AlphaComposite.SRC_OVER)
)
gr.drawImage(img2, 0, 0, null)
gr.dispose()

ImageIO.write(img, "png", new File("bluredge.png"))

元画像

出力画像

動作環境
groovy 1.8.6, JDK7 update4