I�ve been experimenting with hdr effect lately and as a result, I found a very nice photoshop plugin program called Redynamix,adds HDR-like effects to single images. The GUI is easy to understand, with immediate previews for settings. Unfortunately Redynamix available for Windows version only.
P/s: If you dont have photoshop, this plugin also work with IrfanView (free graphic viewer). Redynamix plugin cost $16, and you can try the trial version HERE.
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