c# - 无法在 c# windows 应用程序的 wia 扫描仪中获取完整图像

Question

我正在使用 wia 扫描仪的代码。但是在 75dpi 之后，扫描仪没有给我完整的图像。我从扫描仪中只得到了一半的图像。请检查一下。

    private static void SaveImageToPNGFile(ImageFile image, string fileName)
    {
        ImageProcess imgProcess = new ImageProcess();
        object convertFilter = "Convert";
        string convertFilterID = imgProcess.FilterInfos.get_Item(ref convertFilter).FilterID;
        imgProcess.Filters.Add(convertFilterID, 0);
        SetWIAProperty(imgProcess.Filters[imgProcess.Filters.Count].Properties, "FormatID", WIA.FormatID.wiaFormatPNG);
        image = imgProcess.Apply(image);
        image.SaveFile(fileName);
    }
    private static void AdjustScannerSettings(IItem scannnerItem, int scanColor,
        int scanWidthPixels, int scanHeightPixels, int brightnessPercents, int contrastPercents)
    {

        SetWIAProperty(scannnerItem.Properties, "4104", 24);
        SetWIAProperty(scannnerItem.Properties, "6146", scanColor);
        SetWIAProperty(scannnerItem.Properties, "6147", 75);//Horizontal resolution
        SetWIAProperty(scannnerItem.Properties, "6148", 75);//vertical resolution

        SetWIAProperty(scannnerItem.Properties, "6151", scanHeightPixels);
        SetWIAProperty(scannnerItem.Properties, "6152", scanWidthPixels);
        SetWIAProperty(scannnerItem.Properties, "6154", brightnessPercents);//range from -100 to 100. 0 refer for the normal brightnes
        SetWIAProperty(scannnerItem.Properties, "6155", contrastPercents);//range from -100 to 100. 0 refer for the normal brightnes
    }
    private static void SetWIAProperty(IProperties properties, object propName, object propValue)
    {
        Property prop = properties.get_Item(ref propName);
        prop.set_Value(ref propValue);
    }
    private void button1_Click(object sender, EventArgs e)
    {
        int height = int.Parse(textBoxheight.Text.Trim());
        int width = int.Parse(textBoxwidth.Text.Trim());

        CommonDialogClass commonDialogClass = new CommonDialogClass();
        Device scannerDevice;
        try
        {

            scannerDevice = commonDialogClass.ShowSelectDevice(WiaDeviceType.ScannerDeviceType, false , false);
            if (scannerDevice != null)
            {

                Item scannnerItem = scannerDevice.Items[1];
                AdjustScannerSettings(scannnerItem, 4, height, width, 20, 20);//dpi valid only for 150,200,300,400
                object scanResult = commonDialogClass.ShowTransfer(scannnerItem, WIA.FormatID.wiaFormatPNG, false);
                if (scanResult != null)
                {
                    ImageFile image = (ImageFile)scanResult;
                    // Image objimg = (Image)image;
                    string fileName = Path.GetTempPath() + DateTime.Now.ToString("dd-MM-yyyy-hh-mm-ss-fffffff") + ".png";
                    SaveImageToPNGFile(image, fileName);
                    pictureBox1.ImageLocation = fileName;
                    //pictureBox1.Height = height;
                    //pictureBox1.Width = width;
                    pictureBox1.SizeMode = PictureBoxSizeMode.AutoSize;
                    Bitmap obj = new Bitmap(fileName);
                    panel1.BackgroundImage = obj;
                    panel1.AutoSize = true;
                    panel1.AutoScroll = true;


                }
            }
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }

    private void button3_Click(object sender, EventArgs e)
    {
        pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
    }

    private void button2_Click(object sender, EventArgs e)
    {
        pictureBox1.SizeMode = PictureBoxSizeMode.AutoSize;
    }

    private void linkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
    {
        this.Hide();
        wiascan obj = new wiascan();
        obj.Show();
    }
}

我尝试在图片框和面板中显示我的图像，但两个控件都无法给我完整的图像。