Hi, finally the moment has come that I have to ask for your help. Untill now I have always managed not to take your time, but now I am simply stuck. I am trying to make an HDR using 3 perfectly aligned photos of different exposures... Ususally I have no problem in doing that but in this case the result is terribly "posterised". Below are the source photos, and two results - one with all merge options unchecked and one with all options checked (by options I mean "align" and "remove ghosts" etc.). Does anyone have any idea of what might be causing such behaviour?