## Summation operator The summation operator is started by selecting the menu: Processing / Summator, or the button " Summator " on the toolbar, and its control elements appear on dialog panel and on toolbar. ### Operator parameters description The process of summation has two options. The first - simple summation. This variant uses simple pixel averaging. It is possible to use this for mixing various results of processing. The second option - summation with priorities, is based on "Exposure Fusion" algorithm. In this variant the program chooses from each image the best areas according to priorities and unites these areas in one resultant image. The parameter " Tone splitting " provides for generating intermediate pictures from one exposure or for splitting a RAW file into multiple parts for subsequent processing. The next group of sliders allows to assign weights to different priorities (sharpness, contrast, color saturation, exposure), where 1 means high importance and 0 on the contrary means that this parameter is not important and the program will not take it into account when blending images together. Exposure has two additional parameters: center of tone and radius. If Exposure Center is 0.5 then the best exposure can be found in the middle of exposure interval and areas that have exposure which is close to this value will get higher priority. Displacement of the center to the right (to great values) will provide preference of light tones, displacement to the left - preference of dark tones. The priority will smoothly decrease up to zero on both sides from the center on distance of radius. The smoothing parameter helps to raise contrast of details or to lower halo artefact. Small values of this parameter provide higher contrast of details but also generates some halo artefact. At increased values, it is possible to reduce halos, but contrast of details decreases. The result of both variants can also be modified by parameters of correction of brightness, contrast, color saturation and also by making correction of histogram bounds. The program automatically finds and uses the found bounds. In parameters " left (shadows) ", " right (light) " it is possible to modify the bounds found by the program. All that is outside the bounds will be set to minimum or maximum tone values.
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