Convert Powerpoint PPT or PPTX to JPG in C#

About PowerPoint to JPG Conversion

With Aspose.Slides .NET API you can convert PowerPoint PPT or PPTX presentation to JPG image. It is also possible to convert PPT/PPTX to BMP, PNG or SVG. With this features it’s easy to implement your own presentation viewer, create  the thumbnail for every slide. This may be useful if you want to protect presentation slides from copywriting, demonstrate presentation in read-only mode. Aspose.Slides allows to convert the whole presentation or a certain slide into image formats. 

To see how Aspose.Slides converts PowerPoint to JPG images, you may want to try these free online converters: PowerPoint PPTX to JPG and PPT to JPG.

Convert PowerPoint PPT/PPTX to JPG

Here are the steps to convert PPT/PPTX to JPG:

• Create an instance of Presentation type.
• Get the slide object of ISlide type from Presentation.Slides collection.
• Create the thumbnail of each slide and then convert it into JPG. ISlide.GetThumbnail(float scaleX, float scaleY) method is used to get a thumbnail of a slide, it returns Bitmap object as a result. GetThumbnail method has to be called from the needed slide of ISlide type, the scales of the resulting thumbnail are passed into the method.
• After you get the slide thumbnail, call Image.Save(string filename, ImageFormat format) method from the thumbnail object. Pass the resulting file name and the image format into it. 

Note: PPT/PPTX to JPG conversion differs from the conversion to other types in Aspose.Slides .NET API. For other types, you usually use IPresentation.SaveMethod(String, SaveFormat, ISaveOptions) method, but here you need Image.Save(string filename, ImageFormat format) method.

using (Presentation pres = new Presentation("PowerPoint-Presentation.ppt"))
{
	foreach (ISlide sld in pres.Slides)
	{
		// Create a full scale image
		Bitmap bmp = sld.GetThumbnail(1f, 1f);

		// Save the image to disk in JPEG format
		bmp.Save(string.Format("Slide_{0}.jpg", sld.SlideNumber), System.Drawing.Imaging.ImageFormat.Jpeg);
	}
}

Convert PowerPoint PPT/PPTX to JPG with Customized Dimensions

To change the dimension of the resulting thumbnail and JPG image, you can set the ScaleX and ScaleY for it. To do that, pass ScaleX and ScaleY values into ISlide.GetThumbnail(float scaleX, float scaleY) method:

using (Presentation pres = new Presentation("PowerPoint-Presentation.pptx"))
{
	// Define dimensions
	int desiredX = 1200;
	int desiredY = 800;
	// Get scaled values of X and Y
	float ScaleX = (float)(1.0 / pres.SlideSize.Size.Width) * desiredX;
	float ScaleY = (float)(1.0 / pres.SlideSize.Size.Height) * desiredY;

	foreach (ISlide sld in pres.Slides)
	{
		// Create a full scale image
		Bitmap bmp = sld.GetThumbnail(ScaleX, ScaleY);

		// Save the image to disk in JPEG format
		bmp.Save(string.Format("Slide_{0}.jpg", sld.SlideNumber), System.Drawing.Imaging.ImageFormat.Jpeg);
	}
}

Render Comments when saving Presentation into Image

Aspose.Slides for .NET provides a facility to render comments of presentations or slide when converting those into images.  An example is given below that shows how to render comments of presentation into an image.

Presentation pres = new Presentation("test.pptx");
Bitmap bmp = new Bitmap(740, 960);

IRenderingOptions opts = new RenderingOptions();
opts.NotesCommentsLayouting.NotesPosition = NotesPositions.BottomTruncated;
opts.NotesCommentsLayouting.CommentsAreaColor = Color.Red;
opts.NotesCommentsLayouting.CommentsAreaWidth = 200;
opts.NotesCommentsLayouting.CommentsPosition = CommentsPositions.Right;

using (Graphics graphics = Graphics.FromImage(bmp))
{
	pres.Slides[0].RenderToGraphics(opts, graphics);
}
bmp.Save("OutPresBitmap.png", ImageFormat.Png);
System.Diagnostics.Process.Start("OutPresBitmap.png");

Tip

Aspose provides a FREE Collage web app. Using this online service, you can merge JPG to JPG or PNG to PNG images, create photo grids, and so on.

See also

See other options to convert PPT/PPTX into image, like:

• PPT/PPTX to SVG conversion