Digital SLR Photography - - The Beginner ’s Guide -

as per­spec­tive dis­tor­tion isn’t re­lated to any lens or cam­era, there are no de­fault corrections that can be ap­plied – it all de­pends on the dis­tance be­tween cam­era and sub­ject and how far from par­al­lel the cam­era is from the sub­ject. per­spec­tive cor­rec­tion is often ap­plied man­u­ally, by shift­ing the ver­ti­cal and hor­i­zon­tal axis of the im­age. There are, how­ever, clever soft­ware tricks that can help you along the way. adobe light­room and adobe Cam­era raw have some of the most sim­ple and ef­fec­tive per­spec­tive cor­rec­tion tools built- in. light­room's Trans­form tab of­fers plenty of au­to­matic and man­ual con­trols to suit. These au­to­matic tools read the im­age and look for strong ver­ti­cal or hor­i­zon­tal lines, us­ing these as a ref­er­ence to straighten the im­age. you can then select whether you wish to cor­rect Ver­ti­cal or level ( hor­i­zon­tal) dis­tor­tion, or full ( both axis). depend­ing on the im­age, this can be too ex­treme, so the best op­tion is often to use the auto func­tion, which ap­plies a medium amount of cor­rec­tion – often the im­age isn’t com­pletely cor­rected, but enough to be a marked im­prove­ment on the orig­i­nal.

an­other pow­er­ful op­tion is us­ing the guided con­trols – us­ing the guided up­right tool to place ver­ti­cal and hor­i­zon­tal lines on the im­age, you’re ef­fec­tively telling the soft­ware what ver­ti­cal and level is. light­room them con­torts the im­age to fit these guides. The more ex­treme the per­spec­tive dis­tor­tion, the more dif­fi­cult it can be to cor­rect, and the more you'll have to crop in to an im­age to fix it. also, ex­ces­sive per­spec­tive cor­rec­tion can re­sult in un­usual- look­ing im­ages. as with many edit­ing prac­tices, a lit­tle often looks much bet­ter than a lot.



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