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solar

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Nov 17, 2007
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#1
how do we correct the slight tilt of buildings in a photo thr photoshop?

is there any techniques?

any bro can share their secret? or is there any guide out there?

Appreciate e help :)
 

Feb 4, 2008
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#2
i think for CS2 it is under filter-> lens correction

You can experiment with the settings there....
 

Feb 4, 2008
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#3
Oh... i think there's this special kind of lens that can counter this.... called shift tilt lens i think.... expensive though....
 

denniskee

Senior Member
Oct 26, 2003
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#4
do u mean taper towards the top effect?

i use cropping but turn on the perspective (on the right of the tool bar on top of the screen). but i dont make the building too straight if the taper is extreme, else looks very fake.
 

giantcanopy

Senior Member
Feb 11, 2007
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#5
When you shoot a building and ur sensor surface is not parallel to the building surface you end up with such tapering ends. The more you tilt up to shoot the more tapering it gets.

You can use a perspective control / PC lens ( it is the shift that helps ).
Advantage being you can visualise the borders of the shot taken after correction on the lens.

The other option is to use Photoshop like what the others have mentioned. However to make a geometrically correct correction takes abit of effort as well, and you will have to crop abit of picture elements post correction.

Ryan
 

night86mare

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Aug 25, 2006
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#7
there are 4 things you can correct, if THEY ARE NOT TOO EXTREME in the picture

in this order:

1) lens distortion (usually for wide angle, barrel is a problem).. search for barrel distortion correction to understand what this is. if you shoot scenes regularly with the same lens, as most people do, just remember the amount of correction to apply and you should be fine.

2) horizon levelling - make sure your horizon, if present is STRAIGHT first, don't use vertical edges.. horizons have to be far far away. when no horizon, use far away objects vertical to make sure this is straight. this is done using free rotation.

3) THEN do vertical perspective correction, if your verticals are not straight (don't assume, check first).. this is the one described in the link gien by giantcanopy, KRW tag. this is because you are looking up or down instead of camera back being parallel to the vertical. if not sure what i mean, go close to a wall or pillar, and look up and down, see whether the vertical is coming towards you, or away from you, therefore appearing tilted in 2d context, instead of being vertical.

4) lastly, horizontal perspective correction, not as common, usually can skip. due to wideness of scene, and say, got object running horizontal and meant to be parallel to horizon but is nearer and therefore at an angle, does not appear straight, something like vertical perspective problem..

1,3,4 done with lens distortion filteri n photoshop

if you use a spirit level properly, usually 2,3 eliminated.. 1 will be present no matter what, and is optional to correct in such a case since will not be too obvious, 4 is rare. why you should use a spirit level. :)

if you still don't understand, just note the terms i have mentioned, and:

 

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