diff --git a/test/scannerlib/huagao/c#/WindowsFormsApp1/Form1.cs b/test/scannerlib/huagao/c#/WindowsFormsApp1/Form1.cs
index 0c3ffee3..1b9cd070 100644
--- a/test/scannerlib/huagao/c#/WindowsFormsApp1/Form1.cs
+++ b/test/scannerlib/huagao/c#/WindowsFormsApp1/Form1.cs
@@ -43,26 +43,57 @@ namespace WindowsFormsApp1
                 imageInfo.origin = 0;
                 HGScannerLib.HGLib_GetImageInfo(image, ref imageInfo);
 
-                Bitmap curBitmap = new Bitmap((int)imageInfo.width, (int)imageInfo.height, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
-
-                Rectangle rect = new Rectangle(0, 0, (int)imageInfo.width, (int)imageInfo.height);
-
-                System.Drawing.Imaging.BitmapData bmpData = curBitmap.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadWrite, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
-                unsafe
+                Bitmap curBitmap = null;
+                if (imageInfo.type == 1) // BINARY
                 {
-                    byte* dest = (byte*)(bmpData.Scan0);
-                    byte* src = (byte*)imageData;
-                    for (int i = 0; i < (int)imageInfo.height; i++)
+                    curBitmap = new Bitmap((int)imageInfo.width, (int)imageInfo.height, (int)imageInfo.widthStep,
+                        System.Drawing.Imaging.PixelFormat.Format1bppIndexed, imageData);
+
+                    System.Drawing.Imaging.ColorPalette palette = curBitmap.Palette;
+                    palette.Entries[0] = Color.FromArgb(0, 0, 0);
+                    palette.Entries[1] = Color.FromArgb(255, 255, 255);
+                    curBitmap.Palette = palette;
+                }
+                else if (imageInfo.type == 2) // GRAY
+                {
+                    curBitmap = new Bitmap((int)imageInfo.width, (int)imageInfo.height, (int)imageInfo.widthStep,
+                        System.Drawing.Imaging.PixelFormat.Format8bppIndexed, imageData);
+
+                    System.Drawing.Imaging.ColorPalette palette = curBitmap.Palette;
+                    for (int i = 0; i < palette.Entries.Length; i++)
                     {
-                        for (int j = 0; j < (int)imageInfo.width; j++)
+                        palette.Entries[i] = Color.FromArgb(i, i, i);
+                    }
+                    curBitmap.Palette = palette;
+                }
+                else if (imageInfo.type == 3) // BGR
+                {
+                    curBitmap = new Bitmap((int)imageInfo.width, (int)imageInfo.height, (int)imageInfo.widthStep,
+                        System.Drawing.Imaging.PixelFormat.Format24bppRgb, imageData);
+                }    
+                else if (imageInfo.type == 4) // RGB
+                {
+                    curBitmap = new Bitmap((int)imageInfo.width, (int)imageInfo.height, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
+
+                    Rectangle rect = new Rectangle(0, 0, (int)imageInfo.width, (int)imageInfo.height);
+
+                    System.Drawing.Imaging.BitmapData bmpData = curBitmap.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadWrite, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
+                    unsafe
+                    {
+                        byte* dest = (byte*)(bmpData.Scan0);
+                        byte* src = (byte*)imageData;
+                        for (int i = 0; i < (int)imageInfo.height; i++)
                         {
-                            dest[i * bmpData.Stride + j * 3 + 0] = src[i * imageInfo.widthStep + j * 3 + 2];
-                            dest[i * bmpData.Stride + j * 3 + 1] = src[i * imageInfo.widthStep + j * 3 + 1];
-                            dest[i * bmpData.Stride + j * 3 + 2] = src[i * imageInfo.widthStep + j * 3 + 0];
+                            for (int j = 0; j < (int)imageInfo.width; j++)
+                            {
+                                dest[i * bmpData.Stride + j * 3 + 0] = src[i * imageInfo.widthStep + j * 3 + 2];
+                                dest[i * bmpData.Stride + j * 3 + 1] = src[i * imageInfo.widthStep + j * 3 + 1];
+                                dest[i * bmpData.Stride + j * 3 + 2] = src[i * imageInfo.widthStep + j * 3 + 0];
+                            }
                         }
                     }
+                    curBitmap.UnlockBits(bmpData);
                 }
-                curBitmap.UnlockBits(bmpData);
 
                 curBitmap.Save("3.jpg");