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Luminosity selections

Alessandro Guida
Hi,

Is there a way to work selectively on shadows/midtones/highlights in C1?
Like I would do with luminosity masks in PS

thanks!

Alessandro
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Comments

14 comments

Date Votes
  • John Doe
    Color Balance tool > 3-way tab
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  • Alessandro Guida
    Hi John,

    You are right, but I was wondering if there is a way to select them and create a mask like in the color editor tool "Create masked layer from selection"

    That would allow to work on different luminosity levels with the other tools, like levels and curves
    0
  • SFA
    Alessandro,

    There may be something to try but it is very experimental in terms of how to select just the areas you want to adjust. Difficult to describe but I think you will quickly see what I mean.

    Using the Colour Selection tool will normally give you a "wedge" of colour. If you have a light colout the wedge will be near the centre - a dark colour will be nearer the outside and somewhere in between will be in the centre of the circle. (I suspect the display is non-linear and "representative" so you may need to experiment to see what the "range" gives you.

    You can adjust the range by dragging the inner and outer boundaries of the wedge. (Move the selection point dot in the wedge if you need to reposition the selection point because the adjustments of the boundaries are prevented.)

    You can also drag the selection completely around the circle to take in all colours.(Things get a bit strange if you actually end up joining the boundaries to a full circle so some care is required at that point.)

    That should give you a luminosity range to work with. You may need to experiment to understand where the "ring" needs to be positioned in the radius of the selection circle to get the results you want.

    Bear in mind that, as far as I know, once you have selected the "colour" and created the mask you can only delete it (maybe add back if deleted?) on the layer. There is no way, as far as I know, of reselecting the "colour" to modify the selection for the mask.

    I have not yet made up my mind whether or not that is important in the context of the tool and its use. I suspect not although it might be a little inconvenient sometimes. However I will be interested to hear your opinion.

    HTH.


    Grant
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  • Alessandro Guida
    Hi Grant,

    I've tried what you said but I ended up with a wide selections of colors, most of them on the midtones range even if i restrict the boundaries of the selection in the wheel (that is also something strange).

    What I think is happening is that the color wheel allows selections only on midtones, that can be possible because in very light or dark values colors tend to be white or black.
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  • SFA
    If you create a full circle (or create a ring in that case) then yes you will get all colours.

    If you only went the luminosity for a specific colour range then limit the area to that range.

    The challenge is that with the exception of the darker areas and the lighter areas where there is less separate colour data to play with anyway, much of the range is no dark, mid or light but a mixture of all of them, pixel by pixel. So if you really want a very specific colour or a very specific luminosity you probably need to make a very small selection to deliver the effect you would like. Or maybe try erasing some of the "mask" to moderate the effect.

    Also, if you can, woirk mainly at 100% where the subtlety of the selection will be more easily seen.

    So see what is really going on WITHOUT the details of the image getting in the way, try it with something like a colour card image so that you can work out what controls are possible and what does not work.

    HTH.


    Grant
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  • Alessandro Guida
    Grant, thank you for your explanation but the procedure seems a bit awkward and difficult to apply.

    I was looking for something easy to use, I hope that in the future c1 will include this feature.
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  • SFA
    If you want to suggest the feature as a future enhancement it would be best to create a Support Case and put "Ehnhancement Request: <summary description>......." in the title line and your suggestion in the body of the text.


    HTH.


    Grant
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  • Alessandro Guida
    I will, thank you!
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  • David Kosiur
    I would second a request for the ability to make a true "luminosity mask" that is not based on color, but only luminosity. Quoting Tony Kuyper (http://www.goodlight.us), "Luminosity masks are nothing more than selections based on the brightness values of the image." Once such a mask is created, it can be used to create a selection for an adjustment layer.
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  • SFA
    NN635065147558506738UL wrote:
    I would second a request for the ability to make a true "luminosity mask" that is not based on color, but only luminosity. Quoting Tony Kuyper (http://www.goodlight.us), "Luminosity masks are nothing more than selections based on the brightness values of the image." Once such a mask is created, it can be used to create a selection for an adjustment layer.


    As suggested before - best to create a Support Case with detail for the proposed enhancement.



    Grant
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  • David Kosiur
    Will do.
    0
  • Christiaan mak
    +1 for luminousity masks à la Tony Kuyper.
    It would be a great feature to be able to edit directly in raw on luminousity selections, edits like curves (for very accurate tonal control), saturation etc.

    Chris
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  • Manuel Huettl
    I would be highly interessted in a luminosity mask as well and I already send an Enhancement Request to the support team. This would really be a great feature for new versions... definitely a feature that would make me spend some extra money to update my old 9.x Version to a newer version.

    SFA wrote:
    If you create a full circle (or create a ring in that case) then yes you will get all colours.


    I did try this and it kind of works and at the same time not.
    By doing this I can get a mask of all light colors and for dark colors I can reverse the mask... so far so good. But all gray, white or black tones are not masked since there is no / all color information.
    For example: I picked the light blue sky with the color picker of the color editor. Created a full circle / ring and the created a mask. The final mask fills all the light colors but not the white areas of the sky next to the sun.

    Maybe we get this feature in any future releases... should technically be not that difficult to calculate the mask.
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  • Pavel Voronenko
    +1 looking for this feature as well! ❗️
    NN635065147558506738UL wrote:
    I would second a request for the ability to make a true "luminosity mask" that is not based on color, but only luminosity. Quoting Tony Kuyper (http://www.goodlight.us), "Luminosity masks are nothing more than selections based on the brightness values of the image." Once such a mask is created, it can be used to create a selection for an adjustment layer.
    0

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