The problem with taking photos in a moving car is that it is very hard to get the baseline of the photo on the horizontal. So eventually to get a decent pic, you need to rotate the photo. But after rotation, you need to crop it back to a square. All operations which take time and is relatively annoying. So, I wrote a gimp script.
r = math.sqrt(x*x + y*y)/2 # as calculated for top left corner theta = math.radians(45) phi = math.radians(45 + angle) dx = r * math.cos(phi) - r * math.cos(theta) # -1 * because as the angle comes down, our y decreases dy = -1 * (r * math.sin(phi) - r * math.cos(theta))
Basically, this python-fu script (rot-crop.py) does both operations together and gives you a cropped rectangular image.
rotated 6 odd degrees
Script-Fu is esoteric stuff, but the python plugins can actually be read, understood and written by mere mortals like me.--
My geometry teacher was sometimes acute, and sometimes obtuse, but always,
always, he was right.
[That's an interesting angle. I wonder if there are any parallels?]