Thread: ETTR and Middle Gray

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  1. #81  
    Senior Member nickjbedford's Avatar
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    Well here's some plugin specific evidence that ETTR may not be ideal. This was graded with standard FilmConvert Vision3 settings (no grain) and a cooled white balance as it was too warm at 5600K.

    The first is shot at approximately the right exposure (no adjustment in FilmConvert).



    The second shot is ETTR with probably about 1.5-2 stops under exposure in post. The exposure slider in FilmConvert doesn't display in stops. No other settings, like saturation were changed.



    The saturation is greatly increased when underexposing an overexposed image in FilmConvert. I'll do the same with Nick Shaw's Rec709 LUT plugin and update.

    Granted this is A) ProRes, and B) not a raw converter suite like ACR which would handle things differently.

    UPDATE

    I compared the normal and ETTR shots corrected for with the LUT plugin and that one handles it just fine. Within 5% of the same image, only a different aperture and different depth of field.

    FilmConvert may be doing the right thing for the intent of what it does to emulate film. I'm not sure.
    Last edited by nickjbedford; 11-29-2013 at 06:03 PM.
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  2. #82  
    Senior Member CaptainHook's Avatar
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    Could you post the 2 DNG's Nick? Would be interested to see this in Resolve too.
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  3. #83  
    Senior Member nickjbedford's Avatar
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    Quote Originally Posted by CaptainHook View Post
    Could you post the 2 DNG's Nick? Would be interested to see this in Resolve too.
    I actually shot these in ProRes, but here's two frames of the ProRes 422 HQ files.

    http://www.nickbedford.com/uploads/e...l-exposure.mov
    http://www.nickbedford.com/uploads/e...r-exposure.mov
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  4. #84  
    Senior Member Frank Glencairn's Avatar
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    As I said, ProRes reacts a bit different than raw, since you not just remapping the values during debayer.
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  5. #85  
    Senior Member CaptainHook's Avatar
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    Quote Originally Posted by nickjbedford View Post
    I actually shot these in ProRes, but here's two frames of the ProRes 422 HQ files.

    http://www.nickbedford.com/uploads/e...l-exposure.mov
    http://www.nickbedford.com/uploads/e...r-exposure.mov
    Files don't work?
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  6. #86  
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    For those that want to know.....

    Middle grey in BMD film is 38.4%....

    jb
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  7. #87  
    Senior Member CaptainHook's Avatar
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    Thanks John !
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  8. #88  
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    Quote Originally Posted by Jared Caldwell View Post
    Thanks for the response, Kholi. I was just quoting something from JB when he said he felt like the LOG curve is more linear in nature (maybe that is a misquote) and that he felt that placing your subject at a higher exposure didn't rob you of color information.
    This was only in regards to RAW not ProRes

    JB.
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  9. #89  
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    Quote Originally Posted by John Brawley View Post
    For those that want to know.....

    Middle grey in BMD film is 38.4%....

    jb
    we can check this in waveform, right?
    Dustin Uy-Filmmaker
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  10. #90  
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    Quote Originally Posted by dcloud View Post
    we can check this in waveform, right?
    That's the point. That's where it sits.

    JB.
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