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Thread: Channel Masking for exposure

  1. #1
    whited3's Avatar
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    Mark

    Channel Masking for exposure

    I have been very slack about my photography of late and even slacker about posting here but I do mean to make a mends

    Anyway, I've just learnt about channel masking. Talk about a time saver! In this effort I tried to get rid of the over exposure above the horizon using this method as opposed to laboriously brushing out each segment between the leaves and branches.

    The second image is as shot with no editing. C&C welcome.

    Channel Masking for exposure

    Channel Masking for exposure
    Last edited by whited3; 18th August 2012 at 02:55 AM. Reason: Updated the finished image

  2. #2
    Sponge's Avatar
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    Re: Channel Masking for exposure

    Mark, I think you did a very good job with this technique. I'm still learning when it comes to PP and this looks like something I could use, especially since I still haven't dabbled much in HDR. Could you point me to a tutorial that you followed or give me a general idea of how you did this? I'm just getting into masks so I know the basics but not much beyond that.

    Cheers,
    Patrick

  3. #3
    whited3's Avatar
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    Re: Channel Masking for exposure

    Patrick,

    This method uses the RGB channels to select an area(s) by its luminosity (brightness), then uses this selection to apply lightening/darkening via a Levels adjustment layer where the blend mode is Screen (to lighten) or Multiply (to darken).

    In the layers panel, Channel tab:
    • Select the R, G or B channel that provides the highest contrast.
    • Window/Histogram to show the Histogram.
    • CTRL+Click the selected channel to select the area from 50% to white. See histogram.
    o Shift+Ctrl+ALT click to move the 50% point higher, narrowing the selection towards white.
    o Shift+Ctrl click to move toward darker selections.
    o Use Select/Inverse to swap between selections (for lighten only).

    In the layers panel, layers tab:
    • Add a Levels adjustment layer
    • Set blend mode to Screen to lighten (Multiply to darken).
    Notes:
    • The above 2 steps could be an action.
    • ALT+Click on the mask to see it.
    • Use a brush on the mask (with low opacity) to tidy up if required.

    Hope this makes sense!

  4. #4
    dje's Avatar
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    Re: Channel Masking for exposure

    Mark judging by the before and after shots, the technique seems to be quite effective. I must have a play with it. Thanks for sharing.

    Dave

  5. #5
    whited3's Avatar
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    Re: Channel Masking for exposure

    Thanks Dave. I've updated the finished pic after some resharpening.

  6. #6
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    Re: Channel Masking for exposure

    Thanks Mark for explaining that, I'll give it a try.

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