local area color cast removal

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19 commentaires

  • SFA
    A quick question.

    Have you tried the Normalize tool?
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  • Stanley L. Green
    Thank you.
    Normalize may be fine for normalizing between images but I was unable to make it work for a single image.
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  • SFA
    [quote="NNN636440347581429185" wrote:
    Thank you.
    Normalize may be fine for normalizing between images but I was unable to make it work for a single image.


    I was a long shot - bu I wondered if it might work across 2 copies of the same image or maybe different variant edits of the same image.

    The other option would be something with the Skin Tone tool but if your area to be adjusted has multiple colours that need to be tweaked it could prove difficult. (It's not just for skin tones of course!)

    I think an LCC based approach might be a failure for the same reason.
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  • Stanley L. Green
    I can make it work in AP, but my ability to mask in C1 is considerably better than I can mask in AP/PS. Hopefully one of the experts will take mercy and disclose the magic incantations necessary to make it work
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  • cdc
    Can you share the image in question, or an example image that has a similar problem?
    As detailed as your description might seem, it is still quite vague as to how the color cast exhibits itself in your image and how to go about correcting it.

    For what it's worth, in the past when I've tried to fix color casts by the numbers I haven't always been successful, sometimes ignoring the numbers and eyeballing it gives more pleasing results.
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  • Stanley L. Green
    How do you share an image in the C1 forum? In the AP forum, et al, it is just one click and it is done, in this forum it is an exercise in stealth technology.
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  • Ian Wilson
    To show the image in a post, you need to host the image somewhere (Flickr, Dropbox etc) then put a link to it between Img tags.

    Or just send us a link so that we could download the file.

    Ian
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  • Stanley L. Green
    BOGUS!!!
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  • Ian Wilson
    [quote="NNN636440347581429185" wrote:
    BOGUS!!!

    ?
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  • Stanley L. Green
    As far as I can determine, this is the only forum that has such a convoluted image posting system. On DPreview, LR, PS, AP, etc it is one click.
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  • syncrasy
    [quote="Ian3" wrote:
    [quote="NNN636440347581429185" wrote:
    BOGUS!!!

    ?


    (American?) slang for "uncool" or "unfair."

    Example:

    Evil Duke: Put them in the iron maiden.
    Ted: Iron Maiden?
    Bill, Ted: Excellent!
    [air guitar]
    Evil Duke: Execute them.
    Bill, Ted: Bogus!
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  • SFA
    [quote="NNN636440347581429185" wrote:
    As far as I can determine, this is the only forum that has such a convoluted image posting system. On DPreview, LR, PS, AP, etc it is one click.


    It is what it is. I don't suppose Phase wish to have the potential aggravation of hosting enormous files, managing them and dealing with whatever spam comes along.

    DPreview is part of Amazon who are not unknown for offering web services.

    LR and PS are part of Adobe who are also not unknown for driving things through giant web server implementations.

    I can't speak for AP (assuming that is Affinity Photo?) but Serif has a long history of supplying graphics/drawing applications and and that sort of application tend towards having sharing facilities of one form or another to make it an Artists environment.

    I see no problem providing a link from whatever your favoured file sharing site might be - especially true for videos. I'm not especially keen to take the chance that large images might be downloaded to me as I scroll through a thread. I'm happier to select what I wish to see when and if I wish to see it.

    Just my opinion of course. Others may well disagree.


    Grant
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  • Christian Gruner
    [quote="NNN636440347581429185" wrote:
    I have an image the had a local color cast (irregular boundary and subtle gradation), I was able to "correct the color", but achieved a less than perfect match to the surrounding area.
    I sampled the color cast area before the correction as: 35,45,17 and the surrounding area as 48,47,44. After applying the color correction, the color cast area became 28,28,27. My goal is to get the corrected color cast to match the surrounding area, ie, I'd like the color cast corrected area to be 48, 47, 27 not 28, 28, 27. I was able to get fairly close in Affinity Photo, but my objective to perform the color to match in C1 where I have better control of the mask.


    Have you tried the LCC tool, if you recreate the color casts?
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  • Stanley L. Green
    Thank you for the suggestion. If I am reading the LCC tool instructions correctly I doubt that it will address my problem. My color cast was not introduced by the lens, but was caused by sun light filtering through an intermittent forest canopy. Where the light directly hit the subject (a large bird), the color was fine, however where the light passed through a leaf on the way to the bird the effect was as if there was a splotchy green filter in front of the lens. I was able to get rid of most of the green splotch, now I am trying to match the formerly green feathers to the surrounding feathers.
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  • Christian Gruner
    [quote="NNN636440347581429185" wrote:
    Thank you for the suggestion. If I am reading the LCC tool instructions correctly I doubt that it will address my problem. My color cast was not introduced by the lens, but was caused by sun light filtering through an intermittent forest canopy. Where the light directly hit the subject (a large bird), the color was fine, however where the light passed through a leaf on the way to the bird the effect was as if there was a splotchy green filter in front of the lens. I was able to get rid of most of the green splotch, now I am trying to match the formerly green feathers to the surrounding feathers.


    Ah, then LCC tool isn’t the right choice, no.
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  • Stanley L. Green
    I am doubtful.
    I am still experimenting, not making any progress. I tried cloning a variant, masking the target area, and then used the "NormalizeTool" to adjust the masked area. I was unable to get normalize to work only on the masked area. On one my attempts it worked on everything but the masked area resulting in a collection of really psychedelic colors. It look as if my image had been adjusted by Timothy Leary.
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  • SFA
    [quote="NNN636440347581429185" wrote:
    I am doubtful.
    I am still experimenting, not making any progress. I tried cloning a variant, masking the target area, and then used the "NormalizeTool" to adjust the masked area. I was unable to get normalize to work only on the masked area. On one my attempts it worked on everything but the masked area resulting in a collection of really psychedelic colors. It look as if my image had been adjusted by Timothy Leary.


    Normalise is not enabled for layers - indeed it may not make sense for it to be a layer enabled tool.

    Your best option is probably to try the Colour Editor as the main adjustment - especially the Skin Tone sub-tool (really a colour tone adjuster with colour range constraints to allow tune adjustments) although you may need to experiment with it to achieve the results you need. From your description your are faced with a some rather random variables. I wonder if it might be easier to integrate the effect into the image rather than eliminate it?

    You might also be able to modify some very selective colour selections with White Balance changes but from what you wrote about the effect you see I get the impression that a general adjustment to the affected area is unlikely to give you the result you seek.


    HTH.


    Grant
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  • Martin Knowles
    If the areas of 'wrong' colour are in a colour range you can get a handle on with the Color Editor, select them in the Color Editor, then from the dropdown, select Create Masked Layer from Selection. You'll get a fresh layer with just your colours selected, which will give you a precise way to do any valid C1 retouch that can be done on a layer just to those coloured areas. You can then tune your selection as you would any other mask.

    Since presumably you're getting greenish shadows from the trees, either use the tint settings in White Balance to knock that out, or pull the Color Editor back up, re-select the colour range you want, and adjust the offending color specifically from there.
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  • Stanley L. Green
    Success at last!

    I found an old C1 v7 tutorial by Christian Gruner, "How to get uniform skin tones". In his tutorial he talked about achieving uniform color in a shot of model. I followed his directions and while the color match between to feathers is not perfect, it has come very close. The only problem I encountered was where he talked about using the "uniformity slider". C1 v11.2.1 Skin Tone has a different uniformity slider than C1 v7 and I had to experiment until I got the desired effect.

    Thank you, to all of you who weighed in with suggestions.
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