## Introduction Fusion is a program that processes the photos of multiple exposures of a scene. Many modern cameras allow multiple exposures in an automatic mode using an exposure bracketing function. If the camera does not have an exposure bracketing function, photos can be taken manually. Using the camera automatic exposure mode is a better option since there is less time between photos than with manual exposures. The probability of subject movement in a scene is thereby minimized. For example, below are three exposures: normal, underexposure and overexposure. The HDR (high dynamic range) concept is that in one exposure, it is often not possible to capture all of the detail contained in this scene in the given conditions of illumination. In the middle (normal exposure) frame, there is a lack of detail in shadows and in highlights. The dark (underexposed) frame contains only highlight details, and in the light (overexposed) frame, there are only shadow details.
You import the three frames, the program merges the information and exports them as one frame in which all details of shadows areas and highlights are combined. Input images can be in the following formats: JPEG, TIFF (8bit, 16bit) and RAW. Many cameras can save photos in RAW, an unprocessed format. As a rule, this format contains somewhat more information than can be displayed on a monitor or on a printer. Therefore single RAW files and single TIFF 16bit can be processed by Fusion. In case of a single file, the program will help to redistribute luminance so that at normal contrast there is no loss of detail in the image. Below two images are derived from a single RAW file. The first is without processing, and the second is processed by the program. This image is from RAW file without processing. This photo was processed by the program from the same single RAW file. Single JPG or single 8-bit TIFF can be processed too. Often it is possible to enhance overall detail and raise local contrast.
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