RadImageEditor is a control that can be used to preview and edit images in different file formats. It is meant to be used as a stand-alone control, but has also been integrated in RadRichTextBox.
The operations it can perform on an image are:
Round Corners (including border)
Contrast (and brightness)
Sharpen and Blur
Rotating and Flipping
The image formats it supports are:
RadImageEditor is highly extensible, so you can implement and utilize additional image editing tools, as well as import and export in other formats.