We all have seen it: we took a picture of a building and we end up with a distortion of the image resp. the building. We experience that something that should be perpendicular becomes a weird angle. Building often look as if they were leaning backwards.
That happens when you have to tilt the camera slightly to capture the image, e.g. when you photograph an object like a building that is taller than you. Also when you take that photo just from an angle standing left or right to the object.
It’s called a keystone effect. Using wide-angle lenses makes it look even more distorted.
In Real Estate photography you mostly don’t like the effect and you can avoid it by trying not to tilt the camera and keeping vertical lines vertical. However, sometimes that is again not feasible. Then you make the adjustment in post-production with Photoshop.
In architectural photography same thing: it’s likely you do not want a keystone effect, but, on the other hand, sometimes you want that effect because it is part of your image composition, like pointing the camera upwards to take a photo of skyscrapers: They will appear as if they were coming from the sides into your photo and lines are running towards the vanishing point.
Often it comes down to personal preference
I believe you just look at a picture and you can quickly decide if a perspective correction is necessary and to what degree.
I don’t think it has to be 100% all the time, it depends so much on the particular scene and the only important thing to me is that they eye of the viewer is pleased.
Photoshop can help
There are a some techniques to make things perpendicular if you want or need to.
- Lens Correction: automated or manual or both. And if you have a quality lens you will get better results from Photoshop
- Perspective Warp: powerful perspective correction even in complex scenarios where Lens Correction doesn’t help anymore
Example of Perspective Correction
Effect adds more drama
A TV tower with a bungee jumper
Do we need perspective correction in this photo?
The answer is NO
This is not a distortion, it is an actual building.
Resources & Reference of mentioned and/or used software for this article
Adobe Lightroom / Photoshop CC: Trial versions of Creative Cloud Apps