Hmmm difficult series of questions to answer.
Sitching images is ONLY the 2nd phase of the process.
1st phase- you have to use the proper nodal point, keep the camera and lens absolutely level in each of the 3 image. [taking pictures from a ladder requires extra platform support]
2nd phase- assuming that you have taken 3 superior images that are over the nodal point and absolutely level, stitch the three images together, by having more overlap (say 30%) between the adjacent images allows the stitching software to locate MORE common reference points or ERR reduction.
Taking only 2 pictures allows only 3 degrees [not much area] of overlap between shots, hence the probability of more mismatched ERR's.
3rd phase- it is nearly impossible to have an absolutely ERR free image, so general image clean up is necessary before releasing the panoramas to the client.
For a viewer demo of a 3 shot image please visit:
Just a thought on the matter.
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EasyPano - Panoweaver