How to remove white background color from Bitmap

问题

I want to remove the white background color in a bitmap

Bitmap capcha = new Bitmap("C:/image.jpg");
pictureBox1.Image = capcha;

but I want to display in my pictureBox1 just the image without white that exists in the background

回答1:

try to set transparency in capcha like this:

Bitmap capcha = new Bitmap(@"C:/image.jpg");
capcha.MakeTransparent(Color.White);
pictureBox1.Image = capcha;

I hope it is what u need.

来源：https://stackoverflow.com/questions/15375453/how-to-remove-white-background-color-from-bitmap