Hi, I’m new with Affinity Photo and I’m really impressed by all the features and possibilities. There’s only one thing that I’m not able to do: Fast Precision Perspective Correction which is needed to correct the perspective fault due to an incline (angle) of the camera. I cannot get beyond the iterating proces of slide the four corner until the result is more or less satisfying.
If you do some mathematics you can find a desired correction at the top of the picture of:
(cos(𝛂)xcos(𝛃)/cos(𝛂+𝛃))-1 and at the bottom: 1-(cos(𝛂)xcos(𝛃)/cos(𝛂+𝛃)). In which: 𝛂=angle of the camera and 𝛃=half of the angle of view (= arctan(h/2f) in which h=censor height and f=focus length).
So the desired correction can be calculated precisely as a function of the angle of the camera, if know what focus length was used.
My question: Is there a possibility to construct a procedure, macro or filter to do fast precision perspective correction with the existing tools and features in Affinity Photo?
Vergrotingsfactor.key
