LightRoom: Keystone correction proportions are off

  • 1
  • Problem
  • Updated 5 years ago
  • Acknowledged
  • (Edited)
When correcting geometric distortions of architectural images, I noticed that Lightroom is not getting the proportions right. It distorts the image so that the vertical dimension comes out too short. DxO Viewpoint, however, is doing a perfect job. So why can't Adobe implement a correction feature that works as precise as DxO Viewpoint? I could very well live without the new "Upright" feature - which, by the way, does a horrible job of trying to correct my images automatically.

What I want is a semi-automatic keystone correction feature like DxO Viewpoint which can be used to work on RAW files directly without having to convert them to a non-RAW file first.

Please fix this, Adobe!
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Mr. Architect

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  • frustrated, sad

Posted 5 years ago

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Eric Chan, Camera Raw Engineer

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Did you try using the Aspect slider to correct the aspect ratio?
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Mr. Architect

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I did but that is not an option for me, since it would lead to a complete guesswork. I need the image to be distorted "correctly". Hugin and DxO Viewpoint do exactly that and the result is perfectly precise to be used as a reference to get measurements from the facade in CAD by using the image as an underlay. However, my goal is to not break the raw workflow. Plus when using external editors to fix the distortion I'm left with duplicate files who take up additional disk space.

How come that Adobe chose to include a not-well-working automatic keystone correction feature that distorts the image instead of including a tool to un-distort images to their correct image ratio in a semi-automatic way? If they managed to do the first aforementioned, why not do the second?
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Eric Chan, Camera Raw Engineer

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Upright does actually work well in many cases. But as with all automatic or semi-automatic methods, it doesn't work well in all cases. My suggestion is that you provide one or two sample images of yours that illustrate the problem you're having. You can do so privately if you wish, by sending them to madmanchan2000@yahoo.com. Preferably raw files, since the correction is to be done on the raw data. If the files are large (probably), you can use YouSendIt.com, Dropbox, etc. for transmitting the images. We would use the images both from the point of view of improving both the automatic and the manual tools.
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Mr. Architect

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Here are the files. If you could really make that feature work I'd be very grateful! Thank you for taking a closer look at it. I uploaded the original RAW-file, the manually corrected one by using the "vertical" slider (not using the aspect ratio slider), the DxO Viewpoint corrected version and two images which are produced by using upright in "vertical" and "full" mode.

https://www.dropbox.com/sh/xa2domla3y...
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Eric Chan, Camera Raw Engineer

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Thanks for providing this. I'll look into it.