报告导出拼接图，修改下背景颜色

OTSIncAReportApp/1-UI/Control_Graph/Controls/OutPIC.cs

@@ -181,6 +181,9 @@ namespace OTSIncAReportApp._3_ServiceCenter
                                 Bitmap image = new Bitmap(bitmap.Width, bitmap.Height);
                                 Graphics graph_2 = Graphics.FromImage(image);
 
+                                Color color1 = Color.FromArgb(217, 217, 217);
+                                graph_2.Clear(color1);
+
                                 for (int a = 0; a < fieldlist.Count; a++)
                                 {
                                     if (fieldlist[a].FieldID.ToString() == f.FieldID.ToString())