public static void processPNGTransparency(String fromFile, int fromW, int fromH, String toFile, int toW, int toH) { try { BufferedImage to = new BufferedImage(toW, toH, BufferedImage.TYPE_INT_RGB); Graphics2D g2d = to.createGraphics(); to = g2d.getDeviceConfiguration().createCompatibleImage(toW, toH, Transparency.TRANSLUCENT); g2d.dispose(); g2d = to.createGraphics(); File f2 = new File(fromFile); BufferedImage bi2 = ImageIO.read(f2); Image from = bi2.getScaledInstance(fromW, fromH, bi2.SCALE_DEFAULT); g2d.drawImage(from, 0,0,fromW, fromH,null); g2d.dispose(); ImageIO.write(to, "png", new File(toFile)); } catch (IOException e) { e.printStackTrace(); } }
Java处理图片背景透明度
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