The book is devoted to modern technologies for post-processing digital photographs, ranging from elementary image editing techniques to advanced ones (Fourier analysis, wavelet analysis, gradient fields and others). The theories on which these technologies are based are presented at the level of ideas, without formulas, and their application is illustrated by the processing of the author's photographs (more than 170 photographs and drawings). Computer programs (which can be downloaded from the Internet) that implement these technologies are described. In addition, the book answers many questions that arise when processing photographs on a computer and relate to the basics of color theory, modeling human color perception, calibration and profiling of equipment. Among the traditional methods of post-processing of photographs, special attention is paid to color correction and the creation of panoramas. The book is provided with a list of literature. Intended for photographers engaged in digital photo processing, as well as all those who are interested in computer image processing.