如何更改保存的透明位图的背景颜色 [英] How to change the background color of a saved transparent bitmap

问题描述

我打开PNG图像成位图，使得一些修改，然后将其保存到磁盘为JPG。在那里的PNG有一些透明区域的情况下，它们被保存为黑色。有没有办法改变这种默认行为，以便将图像保存为不同的背景颜色，如白色的？

I am opening a png image into a Bitmap, making some modifications to it and then saving it to disk as a jpg. In the case where the png has some transparent areas, they are saved as black. Is there a way to change this default behavior so the image is saved with a different color background such as white?

感谢

推荐答案

您可以画到一个新的位图，如：

You could draw it to a new bitmap, e.g.

Bitmap newBitmap = Bitmap.createBitmap(image.getWidth(), image.getHeight(), image.getConfig());
Canvas canvas = new Canvas(newBitmap);
canvas.drawColor(Color.WHITE);
canvas.drawBitmap(image, 0, 0, null);

然后保存newBitmap而不是

then save newBitmap instead

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