Lightroom: Adjustment brush applied aleatory after distortion added.

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  • Updated 4 years ago
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When applying "adjustment brush" after added a "distorsion" (in "lens corrections > profil > distorsion") the mask of the brush is applied aleatory : sometime on all the picture, sometime on the half. It's not applied where i clicked.
If i disable "lens correction" the mask is properly applied.

I use LR 5.7
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gael dubois

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Posted 4 years ago

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Steve Sprengel, Champion

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I can't get my LR 5.7.1 on Windows to do anything bad when I have either the lens profile distortion adjusted like in your screenshot or if I use the Manual tab of the lens corrections and add more distortion.

When you see the strange mask areas like you're showing, can you export your current photo as a DNG format and upload that to http://www.dropbox.com/ and post a public share link to it, here?

If you see the distorted mask, then exit LR and restart LR and go back into the Adjustment Brush tool, then reactivate the brush pin that showed the bad mask, is the mask still bad or not? I'm trying to understand if the mask is actually bad or if the display of the red areas is messed up due to some video-driver issue.

Also in an attempt to answer that question, if you adjust the settings of the current adjustment brush that shows the bad mask, for example adjust the exposure up as far as it will go, does the area under the misplaced mask turn almost white or does the area where you actually painted turn white--in other words is the red mask synchronized with where the brush action occurs or not?
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gael dubois

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Here is the link to the DNG file : https://www.dropbox.com/s/1qoejj5nxb4...

I tried exit, restart, reboot, tool, LR or computer.
I have the same problem on a second computer : also a Mac, same version.
I don't think it's a video-driver issue.

And yes, the red mask is synchronized with the brush action. It looks like a geometry problem. I see the brush pin (you know the little round saying it's here you started) in the extreme bottom left of the picture.

But i've found an solution/alternative : in "Lens correction > Profil > Profil"
In my first screenshot you can see "Profil : Canon EOS-1D Ma..." (it's MARK III) which is a value automatically selected by LR.
If I change this value to the second (which is "Adobe"), all seems right.
Here are two pictures with a new try of mask.

Bad mask : Profil Canon EOS-1D Mark III (Canon EF 17-40mm F/4 ULSM)



Right mask : Profil Adobe (Canon EF 17-40mm F/4 ULSM)



Indeed, I use a 17-40mm f/4, ok, but an EOS 40D.

Best regards
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Steve Sprengel, Champion

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I can replicate this. There are two different profiles for the lens and one works and one doesn't. Looking at the lens profile files on disk, the good one, created with the 1Ds III, has more than 10-times the data than the bad one that from a 1D Mark III. It happens in both Lightroom and the Photoshop-ACR plug-in which apparently have the same bad copy of the profile.

More specifically what seems to be wrong is that past a certain point in the image, near the edge, closer to the edge on the left and right and the corners so probably past a certain-size image-circle, the profile data seems to be missing or wrong so any strokes that cross that boundary are distorted and typically magnified.

What I can't replicate is the problem with another 40D image that I downloaded from the internet some years ago or with images from my 7D Mark II.

Even if I sync all your settings from your image to my 40D test image, the brush strokes are fine with both lens profiles.

That makes me think there is something either wrong with this particular image or perhaps with a particular firmware update your camera is using that the camera from my older test image isn't.

Does this problem occur with all your 40D images with these two profiles (regardless of what actual lens you used) or is it just some images or just this one? If the latter, then maybe the image, itself, is corrupted.

Do you always convert to DNG or is your original image a CR2 that shows the problem?
(Edited)
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gael dubois

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Hello.

The problem occurs only with pictures taken with my 17/40mm. If i try with pictures taken with my 50mm f/1.4, and apply the same profil (a 17-40 profil), it doesn't bug : all works correctly.
Here is an example

But it happens with all my 17-40 images.

I never convert ton DNG. I always use CR2 original file. I converted it previously just for you.
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Steve Sprengel, Champion

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Lens profiles can have corrections for many different focal-length and focus-distance combinations in the lens profile and only the one that matches closest will be used. Examining the 17-40 lens profiles with a text editor, in the one that doesn't work properly, it turns out that there are only corrections for three different focal-lengths: 17, 29 & 40, with one focus-distance each, and when corrections are determined, the one that has the closet focal-length/focus-distance combination will be used.

The one test image you supplied was at 17mm. Try an image at 29mm and another at 40mm. I suspect that only the 17mm profile is corrupted, and the 50mm image, above, would be using the 40mm profile segment and be fine.

If you have the 18mm kit lens, try a shot with that at 18mm.
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gael dubois

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Yep, only 17mm is corrupted. Works well with others focal.