P: Automation in the Perspective Lens Correction

+1. It would be great if the perspective correction in LR would operate like the "keystone correction" feature of a well-known competitive product ;-)

Also, an aspect ratio slider would be nice, so one can stretch or shrink the image in one dimension only to get more natural proportions - the other product has this, too ;-)

P.S. As far as I understand, Lightroom already applies automatic aspect ratio corrections when using the perspective sliders. The corrections depend on the angle of field, i.e. on focal length in relation to sensor dimensions. That seems to work well - however, it would be nice to be able to tweak it a little bit.

Edit: To illustrate what I mean in the P.S. two pictures with exactly the same amount of manual correction (vertical=-93, horizontal=0, scaling=50). The first one at 12mm, the second one 135mm focal length, both on an APS-C camera. Note: This perspective correction is for test purposes only and makes no sense for the photos.





Clearly, LR applies a different aspect ratio depending on the focal length.

The perspective correction feature is nice, but very difficult to control because you have to juggle at least two sliders in most cases (rotation, horizontal).

It would be nice if there were a better user interface for this. For example, perhaps it might be possible to draw two lines on the image (similar to the 'ruler' tool in crop view when rotating) and have it set the necessary sliders to make those two lines parallel.

In the crop tool of lr 3.4.1 there is a spirit level. You can mark two points in a tilted line, ét le voila, the line is perfectly horizintal or vertical again. Very intuitive.

The anti-distortion tool i see in 3.4.1 is horrible. It does it ́s work, but you need too much time to get a rectangle again.

My wishlist-entry for LR4 is a comparable easy anti-distortion tool. You mark the 4 corners of a distorted rectangle (window, building etc.) and the tool makes the windows a perfect rectangle again, according to Scheimpflug rules.

Greetings from Germany
Christian Stüben

There is no "Force parallel" feature in Camera Raw as in DxO Optics Pro 6.x.
Raw Converter has instruments to correct lense distorsion, but its not so comfortable as drawing to lines on photo, that must be parallel!

Excuse me for my English

I agree -- it should be possible to draw two lines that should be vertical to set both the rotate and vertical sliders, or to draw two lines that should be horizontal to set both the rotate and horizontal sliders.

It is really a good idea! Thanks!