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 a 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

Bitmap bmp = sld.GetThumbnail(ScaleX, ScaleY);

//Save the image to disk in JPEG format

bmp.Save(destFileName, System.Drawing.Imaging.ImageFormat.Jpeg);

}

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