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Fun with Photoshop
Posted by Stephen Green  ·  21 February 2006

Or Why I'm Not Blogging Tonight

Last year in the UK, I took some pictures of a stone church in village north of London. Most of them turned out like this -

Before.jpg

You can see the problem. With an angle wide enough to get everything in the frame, you get severe perspective distortion. What I've been teaching myself tonight is how to fix that in Photoshop -

After.jpg

A pull to the left and a lift up top, and suddenly everything looks just fine.

You can do this yourself in just a few minutes, once you get the hang of it. While shooting, however, remember not to fill the frame with your subject. You'll lose a lot of the image in the upper corners when you correct for perspective.

Comments

A pull to the left and a lift up top, and suddenly everything looks just fine.

I can't believe you posted that without working in a "Let's Do The Time Warp" joke.

Posted by: Will Collier at February 22, 2006 06:02 AM

TO: Will Collier [NOT!]
RE: One Would Think...

...that the fine people at Adobe would have built SOMETHING into PhotoShop to do this for us.

Regards,

Chuck(le)

Posted by: Chuck Pelto at February 22, 2006 06:03 AM

In the second image my eye is distracted by the oddly leaning tree in the forground.

Posted by: Scott Janssens at February 22, 2006 07:30 AM

Funny, my initial response when I saw the original image was to assume that it was computer generated. It's almost too perfect of a picture (and computer generated images have gotten that good).

Posted by: Will Gore at February 22, 2006 08:10 AM

I find the first picture more appealing. But then, I'm an iiddiioott. =)

It wouldn't let me post without mispelling that last word. What's up with that?

Posted by: Jimmah Carter at February 22, 2006 10:09 AM

Actually, I think it wasn't the "idiot" it was the "whitehouse.c-m" I used in my made up e-mail address...

Posted by: Jimmah Carter at February 22, 2006 10:10 AM

I like the first one better too. It has a spooky quality I associate with old castles.

Posted by: tim maguire at February 22, 2006 10:18 AM

One trick is to use a wider angle lens so that the sensor plane (film or whatever) can be vertical.

Old time cameras, with the lens mounted on a bellows, had an arrangement where the lens could be raised, without rotating the focal plane, but changing the field of view to include a tall building. As long as the film plane was vertical, this worked.

Posted by: steevil(Dr Weevil's bro Steve) at February 22, 2006 11:07 AM

Yeah... not to be a pain here, but the tree on the right is not correct. If you don't have a way to correct the problem in camera (a view camera), nothing is going to really fix it later. Your best bet is staying away from a wide angle lense and sticking with something closer to a "natural" lense like a 50mm

Posted by: john at February 22, 2006 11:48 AM

Actually, the current version of Photoshop CS2 has a feature just for this sort of thing. Its kind of hard to find though.

On the tool menu, its under Filter/Distort/lens correction. The most helpful tool for wide angle shots is the “lens distortion”, which removes (or adds) barrel distortion.

Also available is the “remove horizontal or vertical perspective distortion”. That’s quite handy for this sort of shot too. You can also rotate the perspective through various angles.

Pretty cool stuff, and IMO, those features alone (well, combined with the new RAW processor at least) are almost worth the $550 cost for the full version of Photoshop.

Posted by: jmaster at February 22, 2006 12:50 PM

How do we know the tree on the right isn't actually leaning?

I would think the hardest thing about doing this in some cases would be remembering what the scene really looked like so you could correctly recreate it.

Still, getting rid of the fishbowl look is an improvement, even if we can't guarantee it's perfect.

Posted by: denise at February 22, 2006 01:03 PM

Dollars to donuts you were using your jazzy new 12-24 mm Nikkor lens that set you back a G note. (how I ENVY YOU, you damn plutocrat!).

The secret for avoiding this is to keep the camera level. You pointed the lens up when you shot this picture. The short lens exaggerates the convergence. But as you correctly note, you can fix a lot of different things in Photoshop.

Posted by: Calvin at February 22, 2006 04:33 PM

"A pull to the left and a lift up top, and suddenly everything looks just fine."

Joan Rivers, architect.

Posted by: richard mcenroe at February 22, 2006 06:55 PM

You could also purchase a tilt-shift lens if you're going to be shooting a lot of architecture.

Posted by: Philip Putnam at February 22, 2006 08:05 PM

That's the church in Sarratt, isn't it? The one opposite the excellent Cock Inn?

Posted by: James Hamilton at February 23, 2006 09:02 AM

Shouldn't you've listed your reference?

Weston, M. (2006). Considering Digital?. Writing Magazine, January 2006. Pg 22.

Seriously creepy coincidence otherwise.

Posted by: jmf at February 23, 2006 11:41 AM

Neat! But I think there's a slight overcorrection in the second image. The lamppost in the lower left looks tilted.

Posted by: Taeyoung at February 23, 2006 02:38 PM

Back in the good old days, you hauled your 8X10 bellows camera to the site and tilted the bellows whilst keeping the film plane vertical. f/128 for 30 sec. on Kodachrome (ASA25), no depth of field problem. Of course the camera was on a tripod. But the images were so good. Digital is a lot easier, but the old stuff was a lot closer to art.

Posted by: Robert Schwartz at February 23, 2006 08:11 PM

Cool, but now the clouds are distorted.

Posted by: KBK at February 25, 2006 09:21 AM



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