I have taken a number of photos looking up at the underside of a bridge to try to produce a rectangular image of the cracks. 10m by 8m photographed from 4m below. I loaded all the image into a tiny free program, with no controls, and it produced an almost perfect stitch, with perfect vertical lines (it is a series of parallel beams) but with major barreling top and bottom. The photos appear to be suitable for stitching. I have tried for 20 hours now to use Hugin to get a better result but I am missing something major. I have 50% overlaps, with 30+ control points between each but have gotten nowhere. Even when I tell it that there are verticals, and add in verticals for the full height of a photo, it still bends the output and has poor registration between images. I finally used Xara (like coreldraw) to individually perspective correct each of three images (as a trial) so that the "Vertical" joints were vertical, and the "Horizontal" shutter marks (also with control points assigned) were horizontal but it seemed distorted the images badly and gave an awful colour output. I have tried using mosaic as well as photosphere and every projection I can find but all to no avail. Should Hugin be able to do what I want or am I wasting my time Many thanks
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