photogeneralist wrote:
Hmmm.-- Perhaps if you could run his though some software that has perspective correction so that the verticals along both sides are parallel to the edges of the photo?
Polarr Photo Editor Pro, Luminar 2018, and perhaps Elements 12, among many others, have that capability.
HMMM! I tried both LUMINAR and PolarPhoto Editor Pro and the result was pixellation of the left 1/2 of the photo (Polar) and unable to find again the filter in LUMINAR that corrects distortion. Don't know why I failed with both softwares since I've had previous successes correcting prospective with both. Anyway, I'm confident that it can be done, and cannot afford to send more time on my futile attempts. Let me wish you better luck than I had.