CS4 Auto Perspective Control

[mikelon...@adobeforums.com]

Hi,
I started using CS4 last month after using CS for several years, there are so many new features. One useful feature I found was an auto perspective control that allowed me to straighten vertical lines (from wide angle distortion) with just one click. I used this auto perspective control one time just after installing CS4 but since then can't remember how to access it although I've searched quite a bit. It was not in Filters>Distort>Lens Correction or Edit>Transform>Warp. It was a one-click auto feature, but where..? Hopefully someone can point me in the right direction.
Thanks
Mike

[Nick_...@adobeforums.com]

The Lens Correction filter can help with barrel and pin-cushion distortion, but I'm not aware of an "auto" feature being available with it.

[mikelon...@adobeforums.com]

I'm sure it was a one-click feature because I'd never used CS4 before and was playing around that first day. And I was amazed that it could do that. Here's links to the photos, before and after, they weren't adjusted with the lens correction filter, warp or transform features:

<http://www.pbase.com/mikelong/image/108488451>

<http://www.pbase.com/mikelong/image/108488445>

[John Joslin]

Nick is right it's Filter > Distort > Lens Correction.

Then drag the perspective sliders.

[Jimmy_...@adobeforums.com]

Looking at the posted examples, it appears to be a crop after using filter>distort>Lens Correction>transform>vertical correction. I tried your initial shot and found a vertical correction of about -80 brought the image close to that of your second example. Then after making the correction, use the scaling slider in that same tool to further correct the image. It's not automatic, but seems to be pretty useful.

[Anthon...@adobeforums.com]

Was it the perspective tick box when using the crop tool by any chance?

Anthony.

[mikelon...@adobeforums.com]

John Joslin - 3:20pm Jan 24, 09 PST (#3 of 5)

Nick is right it's Filter > Distort > Lens Correction.
Then drag the perspective sliders.

* **************************** I can assure you it wasn't the lens correction filter, I didn't even know that feature existed until a week later.

[mikelon...@adobeforums.com]

Anthony.Ralph - 4:30pm Jan 24, 09 PST (#5 of 6)

Was it the perspective tick box when using the crop tool by any chance?
Anthony.

* ****************************

I tried that - grabbed the image with the crop tool, then checked the perspective tick box, then clicked the check mark to apply the changes, but nothing happened.

[Rob_K...@adobeforums.com]

This tick box enables you to drag out corners of the selection independently.

Thus it's possible to trapezium-shape the selection according to the shape of the subject.

Can also be done with an ordinary selection, then Edit > Transform > Perspective.

Rob

[mikelon...@adobeforums.com]

Rob Keijzer - 2:40am Jan 25, 09 PST (#8 of 8)

Rob
* ***************************

Thanks Rob. I'm accustomed to making all my perspective adjustments with Edit>Transform>Perspective using my old (CS) version of Photoshop. That's why I was so impressed that I could do this with just one click in CS4 when experimenting that first day - I even called my wife into the room to show her! But I haven't yet been able to duplicate the adjustment.
Mike

[Rob_K...@adobeforums.com]

Mike,

Are you talking about lens distortion (Barrel/cushion/moustache),
or perspective distortion (cone shaped buildings, for instance)?

The former is possible with one click using one of the third party plug-ins like PTlens. This plug-in reads the EXIF data to determine the lens model, and makes corrections off a lens profile database.

The latter takes a view camera or other tilt/shift movements, or perspective correction in PS. (not one click, but nearly)

BTW, if you correct both, the do the lens correction first, otherwise the lens distortion can't exactly cancel out against the profile.

Rob

[mikelon...@adobeforums.com]

Rob,

I'm speaking about perspective distortion, i.e. buildings photographed up close with a wide angle lens resulting in converging vertical lines. But I've never had that plug-in you mention. Somehow I was able to correct this with one click just after loading CS4 and messing around with the program for the first time. That's how I got the resulting image (links in earlier post). Bizarre that I can't duplicate the feature, let alone locate it.

Mike

[Nick_...@adobeforums.com]

Mike, I searched the Help files (such as they are!) for such an auto function and couldn't find anything. If there is such a thing, it's well-hidden.

[mikelon...@adobeforums.com]

Thanks Nick, appreciate your help.
Mike