Ghosting
Ghosting is the term given to superimposed, displaced parts of an image, quite common in any multiple-exposure technique when parts of the subject move.
If you are shooting a scene with passers-by, for example, then it is inevitable that they will be in different positions in each of the frames. Moreover, as this is low light photography, some or all of the frames are likely to show a degree of motion blurring.
Many HDR generators, however, have some provision for attempting to remove ghosting. This works typically by detecting the variance in the image—the areas where the content differs—and then by giving priority to one frame of the sequence. This works most successfully when there are very few frames and movement in just one or two ...
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