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Represents an picture object which will be used as the background picture. The Shape object is a member of the IBackgroundPictures collection. The background picture collection contains all the background pictures on a slide.
public interface IBackgroundPicture : IShape, IContainer
Gets or sets a value that describes how an Image should be stretched to fill the destination rectangle.
ImageLayout BackgroundImageLayout { get; set; }
Gets or sets a value that describes how rounded the corners are on a rectangular die-cut, in pixels.
int CornerRadius { get; set; }
Gets or sets the degree of transparency of the specified picture as a value from 0.0 (opaque) through 1.0 (clear).
double Transparency { get; set; }