Sign documents with additional image adjustments

GroupDocs.Signature contains ImageAppearance class that implements extra image adjustment setting like

gray-scale (Grayscale)
brightness (Brightness)
contrast (Contrast)
gamma correction (GammaCorrection)
border (Border)

Base signature class SignOptions property Appearance should be set with instance of ImageAppearance class to provide additional image adjustment

Here are the steps to setup extra image appearance with GroupDocs.Signature:

Create new instance of Signature class and pass source document path as a constructor parameter.
Compose object ofImageAppearance object with all required additional options.
Set SignOptions.Appearance property with ImageAppearance object.
Call Sign method of Signature class instance and pass SignOptions to it.
Analyze SignResult result to check newly created signatures if needed.

Sign document with image appearance

This example shows how to specify extra image appearances. See SignResult

using (Signature signature = new Signature("sample.pdf"))
{
    ImageSignOptions options = new ImageSignOptions("sample.jpg")
    {
        // set signature position 
        Left = 100,
        Top = 100,
        // set signature rectangle
        Width = 100,
        Height = 30,
        // set signature alignment
        VerticalAlignment = Domain.VerticalAlignment.Bottom,
        HorizontalAlignment = Domain.HorizontalAlignment.Right,
        Margin = new Padding() { Bottom = 20, Right = 20 },
        // setup image additional appearance as Brightness and Border
        Appearance = new ImageAppearance()
        {
            Grayscale = true,
            Contrast = 0.2f,
            GammaCorrection = 0.3f,
            Brightness = 0.9f,
            Border = new Border()
            {
                Color = Color.DarkGreen,
                DashStyle = DashStyle.DashLongDashDot,
                Transparency = 0.5,
                Visible = true,
                Weight = 2
            }                        
        }
    };
    // sign document to file
    signature.Sign("signed.pdf", options);
}

Sign PDF document with Text signature Sticker appearance

This example shows how to add Text signature to Pdf document with sticker look. See SignResult

using (Signature signature = new Signature("sample.docx"))
{
    TextSignOptions options = new TextSignOptions("John Smith")
    {
        // set signature position 
        Left = 100,
        Top = 100,
        // set signature rectangle
        Width = 100,
        Height = 30,
        // setup proper signature implementation
        SignatureImplementation = TextSignatureImplementation.Sticker,
        Appearance = new PdfTextStickerAppearance()
        {
            // select sticker icon
            Icon = PdfTextStickerIcon.Star,
            // setup if popup annotation will be opened by default
            Opened = false,
            // text content of an annotation
            Contents = "Sample",
            Subject = "Sample subject",
            Title = "Sample Title"
        },
        // set signature alignment
        VerticalAlignment = Domain.VerticalAlignment.Bottom,
        HorizontalAlignment = Domain.HorizontalAlignment.Right,
        Margin = new Padding() { Bottom = 20, Right = 20 },
        // set text color and Font
        ForeColor = Color.Red,
        Font = new SignatureFont { Size = 12, FamilyName = "Comic Sans MS" },
    };
    // sign document to file
    signature.Sign("signed.docx", options);
}

More resources

GitHub Examples

You may easily run the code above and see the feature in action in our GitHub examples:

Free Online App

Along with full-featured .NET library we provide simple, but powerful free Apps.
You are welcome to eSign PDF, Word, Excel, PowerPoint documents with free to use online GroupDocs Signature App.

Using Signature Appearances Sign documents with extra Digital Signature properties