Hi,
I tried the soft and on the merging part it works great, but I got horrible colors as an output. I think it's somehow related with the profile used, but I can't find where to tune this up.
I tried to keep on adobe RGB (98) profile, as it was it is stated in the TIFF, but no result.
Here one of the original TIFF :
Here the final result :
To me it looks like some uncontrolled sharpening and saturation push, but I can't get back natural colors, even when desaturating the TIFF file.
I took the following steps :
From iPhoto : export Raw (DNG) into TIFF,
From PFactory : open TIFF, merge them (into TIFF)
Check with iPhoto, colors are horrible compared with the original.