## HDR operator It is started by selecting the menu: Processing / HDR operator, or the button " HDR operator " on the toolbar. If processing more than one image, the remove "ghosting" dialog appears. Set your adjustments and press button " Ok ". It is not recommended to include the remove "ghosting" artefact mechanism if alignment of images is good and no "ghosting" shows. Then operator control elements appear on dialog panel and on toolbar. ### Operator parameters description The top group of sliders - sets the character of process actions. Details threshold and smoothing sliders affect on the size of details and also helps to control halo. Some combinations of these parameters can lead to artefacts (more often when in extreme positions). In that case it is necessary to adjust values of these parameters. Change of these parameters will be visible in the preview image only if at least one of the four sliders that follow (compression and three local contrast controls) has a value significantly greater than zero. At the start of the HDR operation, it is necessary to set at least one nonzero value even to one of them, for example to the local contrast of middle tone. The compression control defines a degree of reduction of the general picture contrast. Parameters of local contrast increase contrast of details in shadows, middle tones and in highlights accordingly. The following six parameters correct the histogram bounds, the middle tone (brightness), contrast, color saturation and color temperature. Various modes of the operator differ by algorithms of processing.
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