删除PNG BufferedImage中的透明度

问题描述

我正在使用以下代码阅读PNG图像：

I'm reading a PNG image with the following code:

BufferedImage img = ImageIO.read(new URL(url));

在显示它时，有一个黑色背景，我知道这是由PNG透明度引起的。我尝试修复这个问题是将每个像素的alpha值设置为不等于255，以 Color.white 。这并没有解决问题。

Upon displaying it, there is a black background, which I know is caused from PNG transparency. My attempt to fixing this was setting each pixel with an alpha value not equal to 255, to Color.white. This did not solve the problem.

我找到了问题的答案，建议使用 BufferedImage.TYPE_INT_RGB ，但鉴于上面的代码，我不确定如何应用这个。任何帮助将不胜感激。

I found answers to the question, suggesting the use of BufferedImage.TYPE_INT_RGB, however I am unsure of how to apply this given my code above. Any help would be appreciated.

推荐答案

创建第二个 BufferedImage 类型 TYPE_INT_RGB ...

Create a second BufferedImage of type TYPE_INT_RGB...

BufferedImage copy = new BufferedImage(img.getWidth(), img.getHeight(), BufferedImage.TYPE_INT_RGB);

将原件涂成副本......

Paint the original to the copy...

Graphics2D g2d = copy.createGraphics();
g2d.setColor(Color.WHITE); // Or what ever fill color you want...
g2d.fillRect(0, 0, copy.getWidth(), copy.getHeight());
g2d.drawImage(img, 0, 0, null);
g2d.dispose();

您现在拥有图片的非透明版本...

You now have a non transparent version of the image...

要保存图像，请查看

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