3 shot trick

What do these two pictures have in Common?







Well. They are in fact the same picture. I tried to take a three shot panorama of St Nic's church in Newbury as an experiment. I used my ultrawide angle lens but I was still far too close really.

I passed the three files to Photoshop and started the autoalignment routine. I cannot imagine the maths involved to make these transformations. I can report that my attempts to do it at 16 bit resolution brought the PC to its knees and I had to abort the process. Photoshop creates various new layers and the image quickly grows to 570Mb. Task manager showed that 2.5Gb of memory was commited at one point.

I guess the attempt to carry out these transformations on that much data proved too much.So, I started again at 8 bit resolution and eventually those two different projections came out.





Here is my attempt at joining the three shots without maths. As you see it is less than optimum...


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