Lens correction bug, bad artifacts with contrast adjustments...

Something has changed between LR3 and LR4 in the processing chain for lens corrections.  Doing an extreme correction (e.g. using a LCP for a fisheye lens) with increased contrast causes bad halos at contrast edges.  The effect doesn't occur with the same settings on LR3.  It is almost as if the LCP is being applied after the basic controls rather than before?!?!?!?!
Ken

So I did a bit more checking.  It is actually the highlights slider that does it - contrast just makes it more obvious.  It is as if the highlights "masking" is getting created in the pre-transformed data and then distorted in some way when going through and extreme LCP like with a fish-eye.  Here is an example, contrast at 100 and the "Strong Contrast" tone curve used in both.  The one of the left has highlights at 100.  Notice the "shadows" in the sky of the leaves, as if the mask was somehow stretched differently from the image data.  This was with a fisheye lens and fisheye LCP.  You can actually recreate the problem to a degree yourself with any image.  Just apply any of the fisheye lens profiles from Adobe (Nikon 10.5mm for example) and look at high contrast regions near the edges of the frame with highlights set to 100%.  You'll see shadows like this (again, easier to see with extreme contrast settings).  Without an extreme profile applied no such effect.

Similar Messages

  • Lens Correction and JPEGs

    Hi,
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    I finally took the "bold" step to put a few of my photos into LR. All my photos are from either a Nikon 3000 or 3100 with the same lens AF-S DX Nikkor 18-135mm f/3.5-5.6G ED.
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    3) Considering where I am and my skills at this point, what is the best recommendation going forward, for learning LR and working with my JPEGs.
    Since I'm going to be essentially working only with JPEGS for a while, what lens correction should I use with these photos? Default/Auto/Custom?
    4) Are there any other settings that I need to pay attention to with the camera/lens/file type that I am using while trying to learn LR?
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    I want to become a more serious amateur and enthusiastic photographer, but I also don't want to spend 15 minutes editing/developing every semi-decent photo I take.
    As an aside, my 3100 has a shutter problem, so I will be upgrading at some point (probably Micro 4/3) and I plan to explore shooting RAW or a combination of RAW/JPEG somewhere down the road.
    Thanks
    Andrew

    As I understand lens correction profiles, most are written for RAW photos only, and there are only a few profiles written for JPGs. That would explain why you don't see your specific lens under Custom.
    2) Also, should I "check" chromatic aberration for all my photos? I'm not sure how this feature works in LR with JPEGs.
    I'm certainly not the biggest expert on chromatic aberration, but it seems to me that the chromatic aberration algorithms are looking for certain types of coloration at "edges", and I don't see why that would be different for JPGs compared to RAWs.
    But I'm confused by the actual question ... checking the box and seeing if it makes the photo better seems so simple that I don't really understand why you had to ask the question.
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    Since I'm going to be essentially working only with JPEGS for a while, what lens correction should I use with these photos? Default/Auto/Custom?
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    I want to become a more serious amateur and enthusiastic photographer, but I also don't want to spend 15 minutes editing/developing every semi-decent photo I take.
    The learning curve can be difficult, but as I said, editing your photos will never harm your originals, and you can always undo whatever you did. So ... just do it.
    I am concerned that even as a beginner, you think it might take you 15 minutes to edit a single photo. Unless you are doing a HUMONGUS amount of brushing, this should never take 15 minutes, even for a beginner. Yes, of course if you want everything to be absolutely PERFECT, then it will take longer, but there really is no such thing as a PERFECT photo. Your goal ought to be (in my opinion) making the photos look GOOD, and learning what the sliders and tools do as you go. And certainly there is no unique determination of what a GOOD photo is, a photo that looks GOOD to you may not look good to someone else, but that's kind of irrelevant, its your photo, it should only matter that it looks GOOD to you.
    You said you watched tutorials, are these tutorials helping, or not? Do you feel you have learned the basic purpose of (some of) the develop sliders and develop tools, or not?

  • Bulk Lens Correction?

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    The only way to "turn on" Lens Corrections for images shot with different lenses and already imported is to use the Library Filter Bar. Select by lens type, correct one image, and then hit the 'Sync Settings' bottom in the lower right-hand corner. Select only 'Lens Profile Corrections' and 'Chromatic Aberrations, which both should be enabled in the first image. Go to the next lens type and repeat, etc.
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    You can add other setting changes to the Develop Default Settings such as the Camera Profile, etc. The Lens Profile default settings can be changed under the Profile tab by clicking on the up/down arrows next to the word 'Setup Default' and selecting 'Reset Lens Profile Defaults.' I set the default Distortion for all my lenses to '0' and manually adjust the images that have visual distortion. Distortion correction crops the image and can introduce softening with lens that have high distortion, such as wide angle zooms. I also set Vignetting to 50%, since 100% correction usually is too much for my taste. Feel free to experiment and set each lens default settings individually.

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    When I first installed CC I was able to rotate, or adjust the image in lens correction and it would automatically crop to the available image dimensions.
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  • Lens corrections and adjustment brush bug

    First of all, congratulations for a spectacular implementation of these seemingly "conflicting" (at least in a non-destructive workflow) features.
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    If you use a large brush, say I want to fill the whole sky in this example, things get a little more complicated.
    Turn on lens corrections and...
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    While we do the best we can mapping the local corrections, it is not perfect if you adjust the lens corrections after applying them, as you can see in some of your extreme examples.
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    Sounds like you need to reset your warning dialog. Preferences>General>Prompts [Reset all warning dialogs]
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  • LR 4.3 lens corrections issue (bug?)

    Hello,
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    Opening the same photo in the same catalog with LR 4.3 this is what I get:
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    Clicking on the Profile arrows gives me the correct lens profile but...
    ... selecting that profile turns everything back off and setup is changed to Custom again.
    Now setting Setup to Default makes no difference! Lens Profile displays None but...
    ... selecting Auto gives me the right Make and Model!!
    And finally, when I leave the image with settings as here above, go the another photo and change the lens corrections, and then go back to the initial image, everything's gone again!!!
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    Regards,
    Peter

    No, that's not it either. Lens Corrections appears in the right panel, between "Detail" and "Effects".
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    This is frustrating, and it will be more so if it turns out that I did something silly!!
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  • Lens Correction Manual Slider Bug!

    Hello,
    I've been having a problem with the Lens correction Manual Sliders. Constrain Crop selected.
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    Is this something that the Lightroom 4 team is aware of?
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    The vertical and horizontal sliders are behaving more like the distortion slider.
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    In conclusion, I see no bugs here. I also fiddled with the various manual sliders, and could not see any behaviour that was different to LR3, which has no bugs in this respect as far as I know...
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    I have the same probem if I try to push the scale slider down below about 87%.  It is quite annoying when it keeps happening on the same photo. It's not something I use a lot but it can be necessary with tall buildings when the correction pushes the top out of the frame.
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