readme.md

Aspose.Imaging .NET API allows to easily add watermark or signature on your images or photos in your .NET application or Web service.

You can:

• Add watermark to image;
• Add signature to image.

Interested ?

You may go further at : https://products.aspose.com/imaging/net/

add-diagonal-watermark-to-image.cs

using Aspose.Imaging;
using Aspose.Imaging.Brushes;
using Aspose.Imaging.FileFormats.Jpeg;
using System.IO;

string templatesFolder = @"c:\Users\USER\Downloads\templates\";
string dataDir = templatesFolder;

// Load an existing JPG image
using (Image image = Image.Load(dataDir + "template.tiff"))
{
    // Declare a String object with Watermark Text
    string theString = "45 Degree Rotated Text";

    // Create and initialize an instance of Graphics class and Initialize an object of SizeF to store image Size
    Graphics graphics = new Graphics(image);
    SizeF sz = graphics.Image.Size;

    // Creates an instance of Font, initialize it with Font Face, Size and Style
    Font font = new Font("Times New Roman", 20, FontStyle.Bold);

    // Create an instance of SolidBrush and set its various properties
    SolidBrush brush = new SolidBrush();
    brush.Color = Color.Red;
    brush.Opacity = 0;

    // Initialize an object of StringFormat class and set its various properties
    StringFormat format = new StringFormat();
    format.Alignment = StringAlignment.Center;
    format.FormatFlags = StringFormatFlags.MeasureTrailingSpaces;

    // Create an object of Matrix class for transformation
    Matrix matrix = new Matrix();

    // First a translation then a rotation                
    matrix.Translate(sz.Width / 2, sz.Height / 2);
    matrix.Rotate(-45.0f);

    // Set the Transformation through Matrix
    graphics.Transform = matrix;

    // Draw the string on Image Save output to disk
    graphics.DrawString(theString, font, brush, 0, 0, format);
    image.Save(dataDir + "result.jpg");
}

File.Delete(dataDir + "result.jpg");

add-signature-to-image.cs

using Aspose.Imaging;
using Aspose.Imaging.Brushes;
using Aspose.Imaging.FileFormats.Jpeg;
using Aspose.Imaging.ImageOptions;
using System.IO;

string templatesFolder = @"c:\Users\USER\Downloads\templates\";
string dataDir = templatesFolder;

// Create an instance of Image and load the primary image
using (Image canvas = Image.Load(dataDir + "template.tiff"))
{
    // Create another instance of Image and load the secondary image containing the signature graphics
    using (Image signature = Image.Load(dataDir + "template.gif"))
    {
        // Create an instance of Graphics class and initialize it using the object of the primary image
        Graphics graphics = new Graphics(canvas);

        // Call the DrawImage method while passing the instance of secondary image and appropriate location. The following snippet tries to draw the secondary image at the right bottom of the primary image
        graphics.DrawImage(signature, new Point(canvas.Height - signature.Height, canvas.Width - signature.Width));
        canvas.Save(dataDir + "result.png", new PngOptions());
    }
}

File.Delete(dataDir + "result.png");