George Cairns shows you how to fix perspective distortion in Capture NX-D
Fix perspective distortion, tilted horizons and sensor spots in Capture NX-D
Generally, buildings have vertical walls. However, if you shoot a tall building from a low angle, perhaps because you lack the space to move back far or there are too many people and distracting elements blocking the view if you do so, then its vertical walls will converge towards the top of the frame. This perspective distortion causes the walls to look as if they lean inwards at the top, rather than running parallel with the edge of the frame. Perspective distortion can also occur horizontally. In a long row of houses, the horizontal roofs and floors will appear to converge as the houses recede towards the edge of the photo.
Perspective distortion isn’t necessarily a problem that must be fixed every time. Converging vertical lines can emphasise the height of a tall building such as a skyscraper, for example. But software such as Lightroom can automatically straighten tilted vertical lines to make buildings look more stable. Capture NX-D sadly lacks this auto correction feature, but thanks to its Straighten and Perspective Control panel, you can make verticals look more vertical and counteract tilted horizons, too.
As our start image also suffers from sensor spots, we’ll squeeze the Retouch tool into this lesson as well. This is an invaluable way to fix these unsightly blemishes caused by dust on the sensor. These can occur in any shooting scenario, but may be especially visible in images shot in bright, sunny conditions, and in image areas with even tones, such as plain walls, clear water and blue sky.