Thread: Gemini Noise Issue

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  1. #1 Gemini Noise Issue 
    Hi everyone.

    I'm a new user of RED and I shoot a commercial for the first time with my new Gemini ! I did a lot of testing before going out for this shoot, especially in low light condition. I saw a bit of noise before, but nothing embarrassing regarding the shooting conditions.
    The problem is that I have noise on a particular shot, and I am very surprised, since the conditions were perfect ! Can you tell me if it's normal ? (see the attachment grab)

    https://drive.google.com/drive/folde...CR?usp=sharing

    Here are my setting and configuration ;
    Manual Black Shading (for every of the exposure time I usually use on set) : 22 feb 2019
    Temp : 39°C (adaptative)

    On Set :
    800 ISO - 1/50 - 25 FPS - 5K WS
    Zeiss Contax 21mm (open at f4)
    RAW Level Bar : at 0 on both side
    T/E : Green
    Camera temp : 39°C (the camera was ON since 30min at least)
    Color management : IPP2 - RWG - Log3G10
    Lut on set : CL Canes (from lutify.me)
    Matte Box : Schneider filter Hollywood Black Magic 1
    Set effect : Smoke

    Thank you everyone.
    (Sorry, my English is a little bit rusty)
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  2. #2  
    Senior Member luigivaltulini's Avatar
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    Quote Originally Posted by Julien Jauffret View Post
    Hi everyone.

    I'm a new user of RED and I shoot a commercial for the first time with my new Gemini ! I did a lot of testing before going out for this shoot, especially in low light condition. I saw a bit of noise before, but nothing embarrassing regarding the shooting conditions.
    The problem is that I have noise on a particular shot, and I am very surprised, since the conditions were perfect ! Can you tell me if it's normal ? (see the attachment grab)

    https://drive.google.com/drive/folde...CR?usp=sharing

    Here are my setting and configuration ;
    Manual Black Shading (for every of the exposure time I usually use on set) : 22 feb 2019
    Temp : 39°C (adaptative)

    On Set :
    800 ISO - 1/50 - 25 FPS - 5K WS
    Zeiss Contax 21mm (open at f4)
    RAW Level Bar : at 0 on both side
    T/E : Green
    Camera temp : 39°C (the camera was ON since 30min at least)
    Color management : IPP2 - RWG - Log3G10
    Lut on set : CL Canes (from lutify.me)
    Matte Box : Schneider filter Hollywood Black Magic 1
    Set effect : Smoke

    Thank you everyone.
    (Sorry, my English is a little bit rusty)
    Link not work, you share permission to pubblic .
    ;)
    Grading Suite Davinci Resolve, Rental RED Digital camera.
    MONSTRO 8k CF #831 "BLACK PEARL" , EPIC-W GEMINI # "DAFNE".
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  3. #3  
    Hi

    I’ve just sent you the access
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  4. #4  
    Senior Member luigivaltulini's Avatar
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    Everything good. Not problems, little bit noise in dark zone...
    You did everything correctly. And also be a beautiful image.
    In fact, technically, you're underexposed, if you look at the histogram, by + -1 stop.
    Perhaps in this case you could have used the low light mode to remove a bit of noise .

    The advice I can give you, do not focus on the single frame, otherwise "go crazy" to look for noise in every corner of the image.
    *Export it and watch it on the move. I think you'll be happier;)
    Grading Suite Davinci Resolve, Rental RED Digital camera.
    MONSTRO 8k CF #831 "BLACK PEARL" , EPIC-W GEMINI # "DAFNE".
    ARRI ALEXA EV , ALEXA MINI LF "ROZI"


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  5. #5  
    Thank you very much for your advices Luigi, It reassures me
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  6. #6  
    Senior Member rand thompson's Avatar
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    Julien,

    I'm probably in the minority here but I say add a little contrast and color back. I don't know if you were going for a "hazy Glow" or if you wanted to lift the shadows in this scene. I think you can still have some more contrast and color and still keep that slight glow-diffused look.

    I tried to reduce the noise in this scene , but it never looked as good as the sort of fine grain noise that's already in this footage. This is only a suggestion and I'm probably completely off track from the look you were "actually" going for but I thought I would put my 2 cents in.


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  7. #7  
    Rand,

    Thanks for your advice. For now, it was just a technical question about noise, but you are right about the color and contrast ,I will work this at the time of color grading !
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  8. #8  
    Senior Member Tommaso Alvisi's Avatar
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    Julien, which OLPF did you use?
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  9. #9  
    Hi Tommaso,

    I use the standard
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  10. #10  
    Senior Member Tommaso Alvisi's Avatar
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    mmm strange...noise seems a little bit excessive @ 800 with the STD OLPF...especially chroma noise
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