C#.net图片快速去底（去除白色背景）

public System.Drawing.Bitmap KnockOutGzf(String path)

       {

           System.Drawing.Image image = System.Drawing.Image.FromFile(path);

           System.Drawing.Bitmap bitmapProxy = new System.Drawing.Bitmap(image);

           image.Dispose();

           for (int i = 0; i < bitmapProxy.Width; i++)

           {

               for (int j = 0; j < bitmapProxy.Height; j++)

               {

                   System.Drawing.Color c = bitmapProxy.GetPixel(i, j);

                   if (!(c.R < 240 || c.G < 240 || c.B < 240))

                   {

                       bitmapProxy.SetPixel(i, j, System.Drawing.Color.Transparent);

                   }

               }

           }

           return bitmapProxy;

   }

引用：https://www.cnblogs.com/guozefeng/p/4178291.html