This book explains the basics of image processing and how to process images using IDL (Interactive Data Language). IDL is a high-level programming language that contains an extensive library of image processing and analysis routines. With IDL, you can quickly access image data and begin investigating the best way to extract useful information. Each chapter introduces image processing topics and includes information regarding when one method may be preferred over another to enhance specific image features. Numerous step-by-step coding illustrate IDL's image processing and analysis routines, allowing you to quickly understand how to get the desired results when working with your own image data. This book is not intended to be a complete source for image processing knowledge, an advanced image processing manual or an image processing reference guide. This book is designed to teach people how to use IDL to perform basic image processing, and does not assume that they are already experts in the field of image processing.