Why building perspective correction is important.

Discussion in 'Beyond the Basics' started by manaheim, Sep 4, 2008.

  1. manaheim

    manaheim Jedi Bunnywabbit Staff Member Supporting Member

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    I'm going to share a little secret here. It's something I use to distinguish a part of my work, so if any of you people come and compete with me on this, I'll send my Uncle Tony out to give you and your camera some lovin'. :lol:

    When we look up at buildings and other vertical structures, our eyes and brains work together to compensate for the odd visual effects that occur. If you stop and pay attention, however, you see that the buildings do not, in fact, appear straight.

    When look at 2d pictures, however, the reality becomes extremely noticable... and yet, for some reason people don't seem to bother trying to fix it. We just accept it as normal and move on.

    HOWEVER, a properly corrected image can have a much greater impact on the viewer. In many cases, the corrected image will feel significantly better to the viewer than the uncorrected one, and they may not even be able to tell you exactly why that is, unless they compare them side by side.

    Now in the past, the process of correction was a manual one and, while not crushingly hard, certainly not terribly easy. Nowadays a company called ePaperPress has a very nice and inexpensive tool called PTLens that greatly simplifies this process. (It still takes some skill and practice, but it's quite managable)

    Here is an example of the results...

    Here is a picture I took before any perspective correction...

    [​IMG]

    And here is the same image AFTER perspective correction...

    [​IMG]

    EDIT: btw, you may notice a TINY angle on the second shot... I've found it works well to leave the tiniest bit of an angle vs. bolt straight, and also keeps you from overdoing it, resulting in an odd Dr. Seuss-y effect.
     
  2. icassell

    icassell TPF Noob!

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    I'm going to have to try that software. I've been thinking of buying a T/S lens, but this would be alot less expensive!
     
  3. tirediron

    tirediron Watch the Birdy! Staff Member Supporting Member

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    As usual, this isn't a ten-cent replacement for thousand-dollar tool. Perspective correction software can do a good job (as illustrated above) but there is a price. The image is cropped, the degree of which depends on how severe the correction is. As with so many other software 'solutions' they're good, but not as good as getting it right in the camera. Of course there's a lot to be said for $15 vice $1500+, but...
     
  4. icassell

    icassell TPF Noob!

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  5. manaheim

    manaheim Jedi Bunnywabbit Staff Member Supporting Member

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    Yeah, I shoot wider than necessary in these situations to ensure I have some extra space to crop without losing the image. I usually lose maybe 5-10% off the sides. Not too bad.

    And yeah... literally $15 instead of even $500 is a pretty significant difference. :)
     
  6. William Petruzzo

    William Petruzzo TPF Noob!

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    Nice. I'll have to give it a try.
     
  7. Flash Harry

    Flash Harry TPF Noob!

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    If possible rather than point the camera/lens upwards, which is what causes converging verticals, go for a higher shooting position if possible, if not move back, less problem, also wide angle lens will accentuate the effect. H
     
  8. Helen B

    Helen B TPF Noob!

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    There's a good correction tool in the later versions of Photoshop as well: Filter - Distort - Lens Correction.

    Best,
    Helen
     
  9. Flash Harry

    Flash Harry TPF Noob!

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    You can also use the Spherize thingy in earlier versions for the same effect. H
     
  10. manaheim

    manaheim Jedi Bunnywabbit Staff Member Supporting Member

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    I'm quite embarrassed to say I didn't know that was there. :lol: It wasn't there before, so it never occurred to me to look for it now. Funny.

    It looks like it doesn't auto correct based upon lens characteristics, though (such as barrel distortion based upon the focal length of the particular lens).

    Still, nice...
     
  11. Neuner

    Neuner TPF Noob!

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    Ah, you beat me to it. I've used the grid lines, barrel distortion and vertical/horizontal correction several times. Works really well, but as stated, you do loose some of the picture.

    If the edge of the picture is uniform or relatively easy to match like sky & grass, to save loosing some of the image I've cloned the perimeter to fill in.
     
  12. manaheim

    manaheim Jedi Bunnywabbit Staff Member Supporting Member

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    Regardless of any of this about what tool you use to do it, I hope the original point isn't lost... this is a GREAT thing to do for pictures of buildings and like objects. (unless of course you're intentionally going for that funky look...)
     

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