Tidy your rooms!

George Cairns ex­plains how to cor­rect lens dis­tor­tion us­ing Cam­era Raw

NPhoto - - Contents -

Dis­cover the quick and easy way to cor­rect lens dis­tor­tion us­ing Pho­to­shop

In Project 1 (page 48) we used a wide-an­gle lens to re­veal more of an in­te­rior, but you may find the lens in­tro­duces some dis­tor­tion. The ver­ti­cal lines in your in­te­rior may curve slightly at the edge of the frame, due to the way the light is warped as it trav­els through the lens. This pin­cush­ion (curv­ing in­wards) or bar­rel (curv­ing out­wards) dis­tor­tion can be dis­tract­ing, as our eyes see walls as be­ing per­fectly straight. In a pho­to­graph the in­te­rior’s walls may also con­verge slightly to­wards the top of the frame, in­stead of run­ning par­al­lel with the edges.

For­tu­nately, Pho­to­shop CC’s Cam­era Raw workspace has all the tools you need to quickly and eas­ily coun­ter­act geo­met­ric dis­tor­tions such as curved lines. It can also coun­ter­act per­spec­ti­val dis­tor­tion and get your in­te­rior’s ver­ti­cals to look truly ver­ti­cal. You can even cor­rect dis­tor­tion pro­duced by user er­ror and make tilted hori­zons run par­al­lel with the bot­tom of the frame. Fi­nally, to cor­rect dis­tor­tions Cam­era Raw has to warp the im­age and this can cause com­po­si­tional changes. We’ll show you how to avoid crop­ping out key de­tails at the edge of the frame when cor­rect­ing dis­tor­tion.

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