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@bitton i believe its merge on Photoshop. you can adjust the contrast overlapping between multiple
photos

He said it is reflection in a window pane, not photoshopped.

This is no Photoshop, not even double exposure. One take, my friend! :) I always write if I make composites in Photoshop.

Which is The Best? Photoshop or Coral Draw?

photoshop is the best for me, especially CC stands for a great workflow and superb performance