/// <summary>/// 获取前五排像素，求出rgb范围/// </summary>/// <param name="path"></param>/// <returns></returns>private List<int> GetModeColor(string path){List<int> colorrgb = new List<int>();List<int> rlist=new List<int>();List<int> glist = new List<int>();List<int> blist = new List<int>();using (Bitmap map = (Bitmap)Image.FromFile(path)){using (Bitmap editMap = new Bitmap(map, map.Width, map.Height)){// editMap.GetPixel()for (int i = 0; i < map.Width; i++){for (int j = 0; j <5; j++){Color color = editMap.GetPixel(i, j);if (!rlist.Contains(color.R)){rlist.Add(color.R);}if (!glist.Contains(color.G)){glist.Add(color.G);}if (!blist.Contains(color.B)){blist.Add(color.B);}}}//添加rgb像素范围
                    colorrgb.Add(rlist.Max());colorrgb.Add(glist.Max());colorrgb.Add(blist.Max());colorrgb.Add(rlist.Min());colorrgb.Add(glist.Min());colorrgb.Add(blist.Min());}}return colorrgb;}

 /// <summary>/// 预览结果/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void button3_Click(object sender, EventArgs e){if (string.IsNullOrEmpty(label1.Text)){MessageBox.Show("请选择颜色");return;}if (string.IsNullOrEmpty(imagePath)){MessageBox.Show("请上传证件");return;}int upnum = Convert.ToInt32(textBox1.Text);int downnum = Convert.ToInt32(textBox2.Text);double trackvalue = Convert.ToDouble(trackBar1.Value);List<int> colorrgb = GetModeColor(imagePath);//上半部分去除颜色范围List<int> upcolorrgb = new List<int>();//下半部分去除颜色范围List<int> downcolorrgb = new List<int>();for (int i = 0; i < colorrgb.Count; i++){if (i>2){upcolorrgb.Add(colorrgb[i]-upnum<0?0: colorrgb[i] - upnum);downcolorrgb.Add(colorrgb[i] - downnum < 0 ? 0 : colorrgb[i] - downnum);}else{upcolorrgb.Add(colorrgb[i] + upnum >255 ? 255 : colorrgb[i] + upnum);downcolorrgb.Add(colorrgb[i] + downnum > 255 ? 255 : colorrgb[i] + downnum);}}//从左到右，从上到下读取像素点using (Bitmap map = (Bitmap)Image.FromFile(imagePath)){using (Bitmap editMap = new Bitmap(map, map.Width, map.Height)){// 上半部分for (int i = 0; i < map.Width; i++){for (int j = 0; j < (int)(map.Height * (trackvalue/100)); j++){Color color = editMap.GetPixel(i, j);//判断像素是否可以移除if (color.R >= upcolorrgb[3] && color.R <= upcolorrgb[0] &&color.G >= upcolorrgb[4] && color.G <= upcolorrgb[1] &&color.B >= upcolorrgb[5] && color.B <= upcolorrgb[2]){editMap.SetPixel(i, j, tempcolor);}}}//下半部分for (int i = 0; i < map.Width; i++){for (int j = (int)(map.Height * (trackvalue / 100)); j <map.Height ; j++){//判断像素是否可以移除Color color = editMap.GetPixel(i, j);if (color.R >= downcolorrgb[3] && color.R <= downcolorrgb[0] &&color.G >= downcolorrgb[4] && color.G <= downcolorrgb[1] &&color.B >= downcolorrgb[5] && color.B <= downcolorrgb[2]){editMap.SetPixel(i, j, tempcolor);}}}//保存string savepath = System.Environment.CurrentDirectory+@"\result\" + DateTime.Now.ToString("yyyyMMddHHmmssffff") + ".png";editMap.Save(savepath);resultPath = savepath;pictureBox2.Image = Image.FromFile(savepath);}}}