asp.net c# 图片合并叠加并去除不是很纯的白色背景源码

来源：互联网发布：bind dns 配置 ubuntu 编辑：程序博客网时间：2024/04/29 19:29

图片合并叠加代码并去白色背景容差为6的所有颜色
        Bitmap bitmap = new Bitmap(@"E:/testb.png");
        Bitmap bmp = new Bitmap(@"E:/0.png");
        Graphics g = Graphics.FromImage(bitmap);

              // 白色容差为6的所有颜色，循环过滤成透明*********************************
                        int[,] colornum = { { 249, 255, 255 }, { 250, 252, 254 }, { 250, 252, 255 }, { 250, 253, 253 }, { 250, 253, 254 }, { 250, 253, 255 }, { 250, 254, 252 }, { 250, 254, 253 }, { 250, 254, 254 }, { 250, 254, 255 }, { 250, 255, 252 }, { 250, 255, 253 }, { 250, 255, 254 }, { 250, 255, 255 }, { 251, 251, 253 }, { 251, 251, 254 }, { 251, 251, 255 }, { 251, 252, 252 }, { 251, 252, 253 }, { 251, 252, 254 }, { 251, 252, 255 }, { 251, 253, 251 }, { 251, 253, 252 }, { 251, 253, 253 }, { 251, 253, 254 }, { 251, 253, 255 }, { 251, 254, 251 }, { 251, 254, 252 }, { 251, 254, 253 }, { 251, 254, 254 }, { 251, 254, 255 }, { 251, 255, 251 }, { 251, 255, 252 }, { 251, 255, 253 }, { 251, 255, 254 }, { 251, 255, 255 }, { 252, 250, 254 }, { 252, 250, 255 }, { 252, 251, 252 }, { 252, 251, 253 }, { 252, 251, 254 }, { 252, 251, 255 }, { 252, 252, 251 }, { 252, 252, 252 }, { 252, 252, 253 }, { 252, 252, 254 }, { 252, 252, 255 }, { 252, 253, 251 }, { 252, 253, 252 }, { 252, 253, 253 }, { 252, 253, 254 }, { 252, 253, 255 }, { 252, 254, 250 }, { 252, 254, 251 }, { 252, 254, 252 }, { 252, 254, 253 }, { 252, 254, 254 }, { 252, 254, 255 }, { 252, 255, 250 }, { 252, 255, 251 }, { 252, 255, 252 }, { 252, 255, 253 }, { 252, 255, 254 }, { 252, 255, 255 }, { 253, 250, 253 }, { 253, 250, 254 }, { 253, 250, 255 }, { 253, 251, 251 }, { 253, 251, 252 }, { 253, 251, 253 }, { 253, 251, 254 }, { 253, 251, 255 }, { 253, 252, 251 }, { 253, 252, 252 }, { 253, 252, 253 }, { 253, 252, 254 }, { 253, 252, 255 }, { 253, 253, 250 }, { 253, 253, 251 }, { 253, 253, 252 }, { 253, 253, 253 }, { 253, 253, 254 }, { 253, 253, 255 }, { 253, 254, 250 }, { 253, 254, 251 }, { 253, 254, 252 }, { 253, 254, 253 }, { 253, 254, 254 }, { 253, 254, 255 }, { 253, 255, 250 }, { 253, 255, 251 }, { 253, 255, 252 }, { 253, 255, 253 }, { 253, 255, 254 }, { 253, 255, 255 }, { 254, 250, 252 }, { 254, 250, 253 }, { 254, 250, 254 }, { 254, 250, 255 }, { 254, 251, 251 }, { 254, 251, 252 }, { 254, 251, 253 }, { 254, 251, 254 }, { 254, 251, 255 }, { 254, 252, 250 }, { 254, 252, 251 }, { 254, 252, 252 }, { 254, 252, 253 }, { 254, 252, 254 }, { 254, 252, 255 }, { 254, 253, 250 }, { 254, 253, 251 }, { 254, 253, 252 }, { 254, 253, 253 }, { 254, 253, 254 }, { 254, 253, 255 }, { 254, 254, 250 }, { 254, 254, 251 }, { 254, 254, 252 }, { 254, 254, 253 }, { 254, 254, 254 }, { 254, 254, 255 }, { 254, 255, 250 }, { 254, 255, 251 }, { 254, 255, 252 }, { 254, 255, 253 }, { 254, 255, 254 }, { 254, 255, 255 }, { 255, 249, 255 }, { 255, 250, 252 }, { 255, 250, 253 }, { 255, 250, 254 }, { 255, 250, 255 }, { 255, 251, 251 }, { 255, 251, 252 }, { 255, 251, 253 }, { 255, 251, 254 }, { 255, 251, 255 }, { 255, 252, 250 }, { 255, 252, 251 }, { 255, 252, 252 }, { 255, 252, 253 }, { 255, 252, 254 }, { 255, 252, 255 }, { 255, 253, 250 }, { 255, 253, 251 }, { 255, 253, 252 }, { 255, 253, 253 }, { 255, 253, 254 }, { 255, 253, 255 }, { 255, 254, 250 }, { 255, 254, 251 }, { 255, 254, 252 }, { 255, 254, 253 }, { 255, 254, 254 }, { 255, 254, 255 }, { 255, 255, 249 }, { 255, 255, 250 }, { 255, 255, 251 }, { 255, 255, 252 }, { 255, 255, 253 }, { 255, 255, 254 }, { 255, 255, 255 } };

                        for (int n = 0; n < 163; n )
                        {
                            bmp.MakeTransparent(Color.FromArgb(colornum[n, 0], colornum[n, 1], colornum[n, 2]));
                        }

                        //******************************************************************************************************************

        g.DrawImage(bitmap, new Rectangle(0, 0, bitmap.Width, bitmap.Height));

        g.DrawImage(bmp,              //叠加图
        new Rectangle(5, 8, bmp.Width, bmp.Height), //要叠加到背景图的位置，尺寸
        0, 0, bmp.Width, bmp.Height      //要叠加的尺寸
        );       //透明阀值

        // Dispose
        bitmap.Save("E:/testb0.png");
        g.Dispose();

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