import java.io.* import java.awt.* import java.awt.geom.* import java.awt.image.* import javax.imageio.* // 画像の左右を暗くする 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] = buf2[1] = buf2[2] = 0 buf2[3] = 255-Math.sin(Math.PI*lx/img.getWidth())*255 wr2.setPixel(lx, ly, buf2) } } def gr = img.createGraphics() gr.setComposite( AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.4f) ) gr.drawImage(img2, 0, 0, null) gr.dispose() ImageIO.write(img, "png", new File("darkerleftright.png"))
元画像
出力画像
動作環境
groovy 1.8.6, JDK7 update4