In the combobox to the right of this checkbox you can select on which photos denoising will be run:
Preset – is a predefined set of alignment settings for a few typica situations, like shooting on a tripod, shooting hand-held or shooting hand-held with strong movement.It’s because Photomatix Pro will crop parts that couldn’t be aligned (because they existed only in one photo for instance). Crop aligned images – if you check this option output image dimensions might be slightly smaller than source images size.Align source images – this option enables alignment of photo which are misaligned (due to shooting hand-held or tripod shake caused by e.g.There are quite a lot of options here including alignment, deghosting, noise reduction and white balance among others: In this dialog we can decide how the source photos will be merged into HDR photo. Just select bracketed files in the library, right-click -> Export To -> Photomatix Pro. Then you will be able to export bracketed photos directly from Lightroom.