java - 在 Java 中操作 PNG

Question

有没有一种简单的方法可以在 Java 中操作 PNG？我知道我可以读入 BufferedImage 并将其写回，但我需要在图像边缘周围添加清晰的像素。是否有捷径可寻？

Answer 1

Never tried it but you could try creating a buffered image at the appropriate size including the border you want around the image. So for a border of 5 pixels the code might be something like:

BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d = image.createGraphics();
g2d.setColor( new Color(0, 0, 0, 0) );
g2d.fillRect(0, 0, width, height);
g2d.drawImage(image, 5, 5, null);

Or if you want to keep the image at its original size then you just use 4 fillRect(...) methods to overwrited the top/bottom/left/right edges of the image.

Answer 2

一个快速的解决方案是使用该setRGB()方法直接设置 RGBA 值。