Why do photographers lean back
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In just a few seconds, your buildings will look as straight as ever. Notice how it appears to be tilting back a little bit. If you look at the lines on the side of the building, as well as the horozontal line near the bottom of the image, you can clearly see how they are at an angle. Photo By Clinton Steeds. It is fatter at the bottom and skinnier at the top. This is what we will be correcting in Photoshop Elements.
One quick word of caution. Some pictures will be too slanted to correct. You would have to adjust them so much that the building no longer fits into the frame. This is something you have to fix in the field. The only solution, in that case, is to photograph them from further away. Now your picture will appear in a new window behind a grid. The grid gives you a visual aid, making it easier to see the distortions that may or may not be in your image. In our case, the distortions are pretty apparent.
You can see how the lines of the building slant through the squares. The best way to know is to start playing with the slider. If it starts to look right, go with it. Our final result is looking a lot more promising. If you start to tilt the camera upwards to see more of it through the viewfinder the lens axis is no longer perpendicular to the face of the building. The upper part of the building is now further away from the camera than the lower part of the building.
The perspective effect is starting to happen as the parallel lines start to converge towards a vanishing point, just as occurs in horizontal perspective. There are several ways to correct this convergence distortion and keep the verticals looking vertical. Three methods are detailed below. You need to get higher up so that you can see more of the upper part of the building whilst maintaining a lens axis that is perpendicular to the face of it. This way, when you observe the building through the lens, all the verticals will remain vertical.
You have to be the right height and distance away to get the whole of the building in the frame though. You may be able to get access to a tall building opposite, a bridge structure or a hillock. This may not be possible but there are other ways to correct the perspective distortion of tall buildings.
The lens of a camera captures a much larger field of view than the small rectangular sensor can receive. We can take advantage of this lost information with a tilt-shift lens. This is a lens that can shift the position of the lens relative to the sensor position. If you take a photo of a tall building at ground level and maintain the perpendicular lens axis as discussed before, you will see an awful lot of the ground plane and very little of the building.
With the tilt-shift lens, you can actually move the lens upwards in relation to the sensor. How to Eliminate Reflections in Glasses in Portraits. How to Create and Shoot Night Portraits. Understanding Light for Better Portrait Photography. How to Use Flash for Night Portraits. Side-by-side comparison between reflectors and diffusers for portraits. The Importance of Shadows in Portrait Photography. So You Have No Model?
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