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wolvesjim
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Color correction query

Apr 16, 2013 7:18 AM

Hi There,

Following gaining a successful resolution to this issue using the 'Screen' mode of the Opacity function, I have now encountered a slightly different issue. Having layered multiple frames, I am experiencing an awful lot of what I think you might call 'noise'. The more I layer the frames of black, the more I lose the pure nice black colour of the night sky and it becomes lighter and more blurry and grey. Is there a color correction or other such function or technique that might eliminate that noise and maintain the clean black color?

Many thanks,

Jim, U.K.

 
Replies
  • Currently Being Moderated
    Apr 16, 2013 8:34 AM   in reply to wolvesjim

    I'll be honest, I don't have a full grasp on what it is you're trying to do here.  Some screen shots might help.

     
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  • joe bloe premiere
    4,391 posts
    Dec 6, 2009
    Currently Being Moderated
    Apr 16, 2013 11:08 AM   in reply to wolvesjim

    You should do this in After Effects using a key

    instead of 'screen' blending in Premiere.

     

    Here is 10 layers 'Luma Keyed' on top of each other in Ae.

    (I downloaded your first image for this comp)

    AeLumaKey.png

     

    You can also use the free Red Giant 'Unmult' plugin for luma keys:

    http://www.redgiant.com/products/all/knoll-unmult-free/compatibility/

     
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  • Currently Being Moderated
    Apr 16, 2013 11:45 AM   in reply to wolvesjim

    So as to understand how each blending mode works, see this help section.

     

    Back to your goal. In your previous thread you was already proposed to use Luma Key. You can definitely try to accomplish your task in PrPro. However, as Joe points out, you're better off with After Effects, 'cos it is a compositor and, hence, designed to do multiple layered compositing much more convenient.

     
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  • Currently Being Moderated
    Apr 16, 2013 11:47 AM   in reply to joe bloe premiere

    You should do this in After Effects using a key instead of 'screen' blending in Premiere.

     

    I agree, except use the UnMult plug-in from Red Giant.  It's free and get's rid of 'black' real good.

     

    http://www.redgiant.com/products/all/knoll-unmult-free/

     
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  • joe bloe premiere
    4,391 posts
    Dec 6, 2009
    Currently Being Moderated
    Apr 29, 2013 5:01 AM   in reply to wolvesjim

    Looks like I'm gonna have to get to grips with AE.

    This stuff will help get you started:

    After Effects Help / Creating layers

    After Effects / Keying effects

    Understanding Luma Keys

     

    Basically, what I did to create the above image:

    Imported your still from post #2 to Ae.

    Created a new composition from the still.

    Duplicated the layer, added a luma key, offset slightly.

    Duplicated and offset the keyed layer 9 more times.

    I downloaded Unmult and copied it into the effects folder but its not showing up when I search my Effects- what have I done wrong?

    Install:

    C:\Program Files\Adobe\Adobe After Effects CS6\Support Files\Plug-ins

    or

    C:\Program Files\Adobe\Common\Plug-ins\CS6\MediaCore

    Both work for Ae.

    You should find it here:

    unmult.png

     
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