1.项目要求上传白底的图片要进行裁剪白边，于是同事谢了个函数感觉很好用。
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#region 剪切白边 /// <summary> /// 剪切白边 /// </summary> /// <param name="p"></param> /// <returns></returns> public static Image Crop(Image p) { int x, y ;//for use of X,Y Coordinates of pixels Bitmap b = new Bitmap(p); //image needed to crop Color c = new Color(); //pixel color for use of identifying if background int intLeft=0;//furthest left X coordinate int intRight=0;//furthest right X coordinate int intBottom =0;//furthest to the bottom Y coordinate int intTop =0; y = 0; while(y < b.Height) { x = 0; while (x < b.Width) //loop through pixels on X axis until end of image width { c = b.GetPixel(x, y); //Get the color of the pixel if (c.R != 255&&c.R!=0 && c.G != 255&&c.G!=0 && c.B != 255&&c.B!=0) { if (c.R < 240 || c.G < 240 || c.B < 240) { //Determine if pixel is further left than the value we already have if (intLeft == 0 || intLeft > x ) { intLeft = x; } //Determine if pixel is further to the top than the value we already have if (intTop == 0 || intTop > y ) { intTop = y; } //Determine if pixel is further right than the value we already have if (intRight <= b.Width && intRight < x ) { intRight = x; } //Determine if pixel is further to the bottom than the value we already have if (intBottom <= b.Height && intBottom < y ) { intBottom = y; } } } x += 1; } y += 1; } int intNewWidth = intRight; //Establish width of new cropped image int intNewHeight = intBottom; //Establish height of new cropped image Bitmap imgCropped =new Bitmap(intNewWidth - intLeft + 2, intNewHeight - intTop + 2); Graphics objGraphics = Graphics.FromImage(imgCropped); //set the background color to white (you can choose what you like objGraphics.Clear(System.Drawing.Color.Transparent); int intStartTop = 1 - intTop; /// 40 + 5 int intStartLeft = 1 - intLeft; /// 40 + 5 //Draw the original image to your new cropped sized image objGraphics.DrawImage(b, intStartLeft, intStartTop); b.Dispose(); objGraphics.Dispose(); //return the Cropped image to the caller return imgCropped; }