So far, we talked about mixing different spectrums or different images. A relatively new technique that involves mixing different versions of the same scene is High Dynamic Range photography. In this technique, we mix multiple shots of the same scene, taken at different Exposure Values (EV). EV, in camera settings, denotes a combination of exposure time and relative aperture. Rules and suggestions about the optimal EV settings for different subjects are extensively covered in the theoretical books and websites about photography and are not really within the scope of this book.
What is within the scope of this book, is to understand what the mixture of multiple EV pictures can accomplish. In a nutshell, it makes the resulting photograph have a greater dynamic range between dark and bright areas in the image. However, to use this technique to its full power, the images that will be mixed should not be 8-bit, since the range of 256 values per color contained...