ImageGear for .NET has the following Image Processing functionality, among others:

• Region of interest (ROI) support for basic rectangles as well as ellipses, polygons and other shapes
• The most complete color space support, including color space conversions, color separation and combination, support for any color space found in any of the 100 supported formats, and support for color spaces such as CMYK, without conversion to RGB, for perfect fidelity
• Powerful color reduction for maximum quality and minimum size
• Encryption and decryption for entire image or any part of image
• Matrix convolutions of any size with pre-defined or user-supplied matrix values
• Special effects, automatic image correction, intelligent re-sizing

See ImageGear.Processing Namespace and Using ImageGear.Processing Namespace for more information.