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Undistorting a wide angle image

  • 15-01-2007 11:02am
    #1
    PaulieC
    Registered Users, Registered Users 2 Posts: 6,196 ✭✭✭


    Hi all,

    I took some pics yesterday at a family gathering, using the Sigma 10-20 wide angle lens (needed it to get everyone in). At the widest angles, from 10-15ish, each side of the images are stretched, creating a very unflattering look for the people siting on either side.
    I was wondering is there anything I can do to negate this effect and make the people look normal again? I'm sure I would not be thinked for making people look like that...

    Sample of ono of the photos attached.

    Thanks for any hints or tips


Comments

  • #2
    Owen
    Registered Users, Registered Users 2 Posts: 12,683 ✭✭✭✭Owen


    Bugger all as far as I know, but the effect is very pronounced.


  • #3
    Roen
    Closed Accounts Posts: 4,620 ✭✭✭Roen


    PTLens is supposed to be the job, but you can also easily do in PSCS2.


  • #4
    Valentia
    Closed Accounts Posts: 3,764 ✭✭✭Valentia


    Hmm. (that's a reference to the amazingly helpful last comment). EDIT: Oops, I mean comment before last. Sorry Ronan :o

    Have a look at this. There is a free trial available: http://www.grasshopperonline.com/


  • #5
    Sebzy
    Registered Users, Registered Users 2 Posts: 1,775 ✭✭✭Sebzy


    Might try the lens Distortion Filter in photoshop too


    Just messing around for a second or two and set distortion to -18
    ld-attachment.jpg


  • #6
    PaulieC
    Registered Users, Registered Users 2 Posts: 6,196 ✭✭✭PaulieC


    Roen wrote:
    but you can also easily do in PSCS2.

    I have Photoshop 7. How would you go about doing something like this? I'm pretty clueless about photoshop

    Edit: Thanks Sebzy, that looks great. Ehm...do you have instructions ?


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  • #7
    Sebzy
    Registered Users, Registered Users 2 Posts: 1,775 ✭✭✭Sebzy


    Using CS2 here

    Open image in photoshop
    Select Filter->Distort->Lens Correction....
    Set remove distortion to -18 and apply

    TADA


  • #8
    PaulieC
    Registered Users, Registered Users 2 Posts: 6,196 ✭✭✭PaulieC


    excellent. Will try this out tonight. Thanks Seb


  • #9
    Roen
    Closed Accounts Posts: 4,620 ✭✭✭Roen


    Had a video about this...I'll see if I can dig it up and send it on.
    Will PM the link to you Cambo. You'll need WinRar and quicktime installed.


  • #10
    311
    Closed Accounts Posts: 5,332 ✭✭✭311


    sorry for being OT ,is pin cushion distortion a factor of wide angle lenses like the 10-20 ?? .
    Sometimes I can see distortion in the centre of images i.e. Lamposts.


  • #11
    Roen
    Closed Accounts Posts: 4,620 ✭✭✭Roen


    Normally get barrel distortion from wide angles and pin cushion from longer focal lengths, in particular telephoto lenses of long FL.


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  • #12
    JMcL
    Registered Users, Registered Users 2 Posts: 2,357 ✭✭✭JMcL


    _Brian_ wrote:
    sorry for being OT ,is pin cushion distortion a factor of wide angle lenses like the 10-20 ?? .
    Sometimes I can see distortion in the centre of images i.e. Lamposts.

    It does, but apparently most obviously in midrange (see here). Looking at those charts though, it doesn't look too extreme, so I'd say you're mostly seeing the effect extreme wide angles have on straight lines.


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