Render Slide as Thumbnail to JPEG by User Defined Values

To generate the thumbnail of any desired slide using Aspose.Slides for .NET:

  1. Create an instance of the Presentation class.
  2. Obtain the reference of any desired slide by using its ID or index.
  3. Get the X and Y scaling factors based on user defined X and Y dimensions.
  4. Get the thumbnail image of the referenced slide on a specified scale.
  5. Save the thumbnail image in any desired image format.
string filePath = @"..\..\..\Sample Files\";
string srcFileName = filePath + "User Defined Thumbnail.pptx";
string destFileName = filePath + "User Defined Thumbnail.jpg";

//Instantiate the Presentation class that represents the presentation file
using (Presentation pres = new Presentation(srcFileName))
{
    //Access the first slide
    ISlide sld = pres.Slides[0];

    //User defined dimension
    int desiredX = 1200;
    int desiredY = 800;

    //Getting scaled value  of X and Y
    float scaleX = (float)(1.0 / pres.SlideSize.Size.Width) * desiredX;
    float scaleY = (float)(1.0 / pres.SlideSize.Size.Height) * desiredY;

    //Create a full scale image
    using (IImage image = sld.GetImage(scaleX, scaleY))
    {
        //Save the image to disk in JPEG format
        image.Save(destFileName, ImageFormat.Jpeg);
    }
}

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