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Is this a bug?

2eyesee
Here is my image developed using default Capture One settings:



Here is what happens if I use local adjustments to add a vignette to the image (I've greatly exaggerated the vignette to highlight the problem) :



What is causing the bright outline on top of the hills and trees?

All I did was create an Adjustment Layer, right-clicked and selected 'Fill Mask', then using a brush on Erase Mask painted out the middle area I didn't want affected by the vignette. Then I dragged the Exposure slider to the left to produce the vignette (greatly exaggerated in this case to highlight the effect).
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Comments

9 comments

Date Votes
  • Drew Altdo
    Just looks like the mask needs refinement is all.
    Try using the erase brush with a large feather to blend in the mask.
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  • mli20
    [quote="NN635509321137003781UL" wrote:
    ...
    What is causing the bright outline on top of the hills and trees?

    HI,

    I believe the outline is a tell-tale sign of the auto mask option having done its work. The auto mask option will always produce sharp edges, thus working counter to the feathering to which you have set the brush.

    The bright outline is created because the auto mask is working its way along a gradient between two luminosity values. It's not aware of the two distinct values the gradient is spanning, instead it is working its way along the gradient, at some point reaching a luminosity value sufficiently different from the starting value for it to decide that it has spanned the gradient, when in fact it has not quite done so.

    Some photo software will allow you to feather and/or expand/contract a mask a few pixels after it has been created. That's not possible in COP8.

    Cheers,
    MOgens
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  • Permanently deleted user
    If you want to add a vignetting (positive or negative) you could do this also via the specific function on the lens correction tab.
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  • BeO
    Top Commenter
    Some photo software will allow you to feather and/or expand/contract a mask a few pixels after it has been created.


    I wish Capture One could do. Re-working such complex edges (here the at the trees) is not fun. I have spent a lot of time with it for mountains, trees etc.

    Anyone who also wishes that Phase One enhances the masking features, please speak up, this might give the product responsibles an indication about how much value such feature enhancements would have for us.

    All the best
    BeO
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  • Permanently deleted user
    Well, when I want to change something on a mask I simply switch to the mask erase tool selecting a brush size / hardness as needed to remove specifically what needs to be removed.

    Edit: And if something unwanted is remved from the mask, switch back and paint again.

    Edit 2: Another possibility is adding a further layer with mask copied from a previous and change opacity / values / correct masking by erase.
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  • BeO
    Top Commenter
    Thanks Michael,

    I know these functions and also use them to accomplish to smoothen the edges. Nevertheless, I find it a very tedious work to do for complex edges like the forest-to-sky edge from the post-opener with the unutterable name...

    My intention was to encourage Phase One to improve the masking functions so they have an even better product to sell and we users have to spend less time with masking...

    Best regards,
    Marc
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  • 2eyesee
    [quote="mli20" wrote:
    I believe the outline is a tell-tale sign of the auto mask option having done its work. The auto mask option will always produce sharp edges, thus working counter to the feathering to which you have set the brush.


    Thank you! That's all it was - I just had auto-mask ticked in the brush.

    Problem solved 😄
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  • 2eyesee
    [quote="Michael11" wrote:
    If you want to add a vignetting (positive or negative) you could do this also via the specific function on the lens correction tab.


    The vignette tool is too limiting in Capture One. You can't set a midpoint on it like you can in Lightroom and DXO, so you have very little control over it, which is why I am using a brush to achieve the look I want.

    It's all good now though, as the problem was just caused by me having auto-mask ticked when using my erase brush.
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  • mli20
    [quote="2eyesee" wrote:
    [quote="mli20" wrote:
    I believe the outline is a tell-tale sign of the auto mask option having done its work. The auto mask option will always produce sharp edges, thus working counter to the feathering to which you have set the brush.


    Thank you! That's all it was - I just had auto-mask ticked in the brush.

    Problem solved 😄

    Lovely to hear. Thanks for your feedback.

    Cheers,
    Mogens
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