LR 5.5 Bug - Lens Corrections persist despite unchecking in module

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  • Problem
  • Updated 4 years ago
Very evident when using Canon 100/2 and turning on Remove CA. This caused blue lips on portrait so unchecked but blue remained until I turned off the lens correction module.
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Eyal Oren

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Posted 4 years ago

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Steve Sprengel, Champion

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Can you provide a sample file that demonstrates the issue?
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Eyal Oren

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CR2/XMP or JPGs with checked/unchecked?
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Steve Sprengel, Champion

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You're reporting an issue. I'm asking for whatever file you've imported into LR--the master photo--not something you've exported that has the issue baked in, so I can import the same photo and see if I see the issue.

I don't see any problems with the raw photos from my camera, because the lens-profile and CA checkboxes turn on and off their respective corrections as they always have.

If you have applied some non-default settings to your photo, then having the XMP data with those settings might be useful in case they have some bearing on the issue.
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Eyal Oren

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File linked below. Just confirmed the above by reimporting. Here is how to duplicate:
1. Import
2. Zoom in to 100% so can see lips and left fourth fingernail
3. Lens Corrections - Color - check Remove CA
4. Defringe Amount = 7
5. You should see a blue halo around fingernail and blue line on left lower lip
6. Uncheck Remove CA - no effect
7. Turn off Lens Corrections globally - blue disappears

https://www.dropbox.com/s/a025h1yrk5v...
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Eyal Oren

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It's been two weeks. Can anyone confirm that this is a 'bug'?
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Rikk Flohr, Champion

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Sorry. Tested it. Turn Off Lens Corrections globally - blue remains. So, no, I cannot confirm this is a bug.

BTW I get a much better image with Defringe set to 5.
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Eyal Oren

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Hi Rikk,

Sorry, I'm confused. The blue is not in the untouched RAW file. It occurs when defringe is 'on'. But it does not disappear for me when defringe is turned off by unchecking Remove CA. It only disappears when I turn off Lens Corrections globally.

The Defringe 7 is a preset for the 100/2 lens. Seems to work well for most images but then I get the blue bleed sometimes like in this one.
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Steve Sprengel, Champion

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What I see is not a blue bleed. It is the gray left behind from desaturating purple edges that get neutralized with the Purple Fringe Amount turned up too high. The color is a neutral gray, not blue, but blue by comparison to the magenta-toned lips.

The Remove CA checkbox turns on and off the automatic alignment of the red, green and blue pixel planes so as to remove the CA that arises from these being slightly different sizes due to the different wavelengths of red, green, and blue light.

The Defringe section with Purple and Green sliders and color ranges is independent of the Remove CA and is doing something else.

As far as your example picture, to duplicate exactly what you're seeing, we need any adjustments you've made that affect color. Things like: WB if not As Shot, the Camera Profile if not Adobe Standard, HSL if not all zeros, NR-Lum if Amount not 0, NR-Color if Amount not 25, Purple Defringe Range if not 30/70, and Green Defringe Range if not 40/60.

The situation you're describing, of the Remove CA checkbox not affecting the Purple and Green Fringe sliders' effect is normal, and not a bug. Setting the Purple and Green Fringe Amount sliders to 0 is what turns their effect off, that and turning off the Lens Corrections panel, entirely.
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Eyal Oren

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Thanks everyone.

Steve - I assumed that the remove CA checkbox drove those settings. Seems silly to have a checkbox there that doesn't turn off the adjustments below but I'll accept that as a software decision that Adobe made.
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Steve Sprengel, Champion

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It might be confusing if you don't already know what Remove CA and Defringing do, but there are several clues that the Remove CA is independent of the Defringing.

First, there is a horizontal line across the entire panel that separates the Remove CA from the Fringing sliders below:

Now, of course, on the profile tab, there is also a checkbox that enables the rest of the tab with a horizontal line separating it from the part that it disabled, but in that case, the sliders, themselves gray-out so you cannot move them. In the case of the Remove CA and Defringing sliders, unchecking the Remove CA doesn't disable the sliders. Maybe this is what you thought was a bug.

Secondly, the Remove CA checkbox is also on the Basic panel without any Defringing sliders below it, and where it clearly does not disable the things below it even though there is no horizontal line to separate it from the things below. In this situation there are several items in a row so it is easy to understand they are independent peers of each other and not one controlling those below it.

Thirdly, and only people that have used LR for many versions, already, would know, that the Remove CA slider has been around for many years, whereas the Defringing was added only a few versions ago.

Finally, your lens is good enough that there isn't much Lateral CA in the first place. If there were more then you could actually see the RGB planes shift the image slightly when clicking the Remove CA on and off, and it would be obvious that this wasn't doing the same thing as the Defringing. In your example picture there is not much change to the CA when Remove CA is enabled or disabled so you might just assume it controls the Defringe below it since enabling and disabling the checkbox don't seem to have any other obvious effect.

Anyway, now you know, and won't be confused from now on, although that still won't help with the Defringing sometimes taking a bite out of more than just a fringe.