Hi,
Here's some sample code to rotate an image using the RotateCommand class:
Rotating an Image using the RotateCommand class
[C#]
RotateCommand rotate = new RotateCommand(90, Color.White);
// The RotateCommand always returns new image
ImImage newImage = rotate.Process( img );
The Image Processing topic in the How To section of the helpfile has more info on using the various processing classes.