Image Editing has become a key element in the photographic workflow. Image editing tools, most notably Photoshop, are usually sophisticated and deep applications - and fairly expensive. The only open source tool in this market is the GIMP, which has developed into a powerful multiplatform system, running on Linux, as well as OS X and Windows. This book has evolved from the classroom materials the author developed and used in courses and workshops on Image Editing with the GIMP. It covers the basics of image editing and guides the reader through the functions and tools of GIMP from simple adjustments to more advanced techniques with layers and masks. The more important editing functions are presented in individual workshops. Moreover, the book covers the stitching of panoramic images and preparation of high-quality black and white images.