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[Submitted] Incorrect Exposure

  1. hassan987
    Gingerbread Jun 21, 2018

    hassan987 , Jun 21, 2018 :
    Majority of photos are overexposed and then image processing applies a -ve brightness/exposure value to correct the exposure. This leads to increased noise due to higher ISO. -ve brightness values are recorded in EXIF data. OP6 uses higher ISO slower shutter than all flagship phones for equal F-number. Sometimes Galaxy S9 uses ISO80 when OP6 uses ISO1600. Brightness value on S9 will be +4.50 and on OP6 -3.20. I think it's caused by OP6 overexposing all photos and repairing in post.
     

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  2. ZiiVic94
    Gingerbread Jun 21, 2018


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  3. hassan987
    Gingerbread Jun 21, 2018

    hassan987 , Jun 21, 2018 :
    Yeah it makes no sense i was comparing photos of my wristwatch indoors:
    *iPhone SE was using ISO 32 while OP6 was using ISO 400

    * OP6 used slower shutter speed than iPhone SE.

    * In other words OP6 took in way more natural light.

    But the iPhone photos came out much better. OP6 results were dark and full of noise!

    Reason is too much natural light, followed by in-software darkening to fix exposure.
     
    Last edited: Jun 22, 2018

    #3
    ZiiVic94 likes this.
  4. ZiiVic94
    Gingerbread Jun 21, 2018

    ZiiVic94 , Jun 21, 2018 :
    That's the natural consequence of OP6's poor stability. I fully agree with you.
     

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  5. hassan987
    Gingerbread Jun 22, 2018

    hassan987 , Jun 22, 2018 :
    It is caused by OP6 capturing over-bright images and then darkening them before saving JPEG.
     
    Last edited: Jun 22, 2018

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  6. hassan987
    Gingerbread Jun 22, 2018

    hassan987 , Jun 22, 2018 :
    At low light the same problem gets worse, because OP6 captures even more noise and shake, to record an over-bright image. Then image is darkened before saving JPEG.
     
    Last edited: Jun 22, 2018

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  7. hassan987
    Gingerbread Jun 22, 2018

    hassan987 , Jun 22, 2018 :
    Correct implementation would capture normal brightness, so that no darkening is required.
     

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  8. hassan987
    Gingerbread Jun 22, 2018

    hassan987 , Jun 22, 2018 :
    That would automatically reduce noise and shake as ISO can be lower and/or shutter can be faster.
     

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  9. ZiiVic94
    Gingerbread Jun 23, 2018

    ZiiVic94 , Jun 23, 2018 :
    This way you'd have less details. It's the other way around. Proof is that huawei p20 pro's night capture mode make its camera shutter stay open for about 4 seconds and the result is actually the best in the market, no one can deny that. Try to look in the net and you'll see I am right. If it were like you say then p20 pro's photos would be full of noise, but they absolutely aren't.
     

    #9
    hassan987 likes this.
  10. ZiiVic94
    Gingerbread Jun 23, 2018

    ZiiVic94 , Jun 23, 2018 :
    It's obvious that OP6's shutter stays open for longer time than S9, you are comparing a f1.7 vs a f1.5! S9 having a f1.5 is able to catch more light than a f1.7 in the same period of time. Obviously that means that S9's shutter will close before OP6's one because it caught the light it needed faster than OP6. That's why Oneplus need to improve stabilization. If there's a photography expert on this forum I'd like to hear his/her opinion.
     

    #10
    hassan987 likes this.
  11. hassan987
    Gingerbread Jun 23, 2018

    hassan987 , Jun 23, 2018 :
    No I'm comparing f/1.7 with f/2.4 of S9. Its because S9 has two aperture settings.

    S9 tends to use f/2.4 more. F/1.5 is rarely used in very dark environments. Reason is f/1.5 reduces sharpness of the optics.

    Even when comparing S9's f/2.4 with OP f/1.7, ISO of OP is higher and shutter speed is same.

    It is a bad exposure program. For maximum detail correct exposure is needed. Not an overexposure combined with software dimming.

    That's why sunlight shots on OP6 look pale in comparison to other flagship phones.
     
    Last edited: Jun 23, 2018

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  12. hassan987
    Gingerbread Jun 23, 2018

    hassan987 , Jun 23, 2018 :
    With Huawei P20 there is a 20MP monochrome sensor with specific purpose to aid low-light photos using pixel binning.

    Other phones without the monochrome sensor such as iPhone and S9 do not use 4 second shutter either
     

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  13. hassan987
    Gingerbread Jun 23, 2018

    hassan987 , Jun 23, 2018 :
    After some more consideration, I think the root cause is that the "Viewfinder" or "Preview" is faulty, and results in extra-bright exposure settings.

    What im trying to say is that it is an "Exposure Metering" flaw.

    The "exposure metering" performed at the preview/viewfinder mode is faulty and results in an overexposed capture.

    I just took two photos in my room, one with auto settings and one with RAW mode.

    Auto used ISO 4000 shutter 1/33

    Manually I set ISO400 shutter 1/10

    Of course the "Manual" photo came out clean without noise.

    Therefore it is basically an "Exposure Metering" bug.
     
    Last edited: Jun 23, 2018

    #13
    thales.th and EdoMav95 like this.
  14. ZiiVic94
    Gingerbread Jun 23, 2018

    ZiiVic94 , Jun 23, 2018 :
    You basically wrote that setting shutter to stay open longer (like I said all this time) fixes the problem.
     

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  15. hassan987
    Gingerbread Jun 23, 2018

    hassan987 , Jun 23, 2018 :
    Yes but ISO was 10 times less. So it was still less natural light than before.
     

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  16. ZiiVic94
    Gingerbread Jun 23, 2018

    ZiiVic94 , Jun 23, 2018 :
    Of couse it was, because sensor already caught all the light it needed. Search for iso on the net please. ISO brightens photos.
     

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  17. hassan987
    Gingerbread Jun 23, 2018

    hassan987 , Jun 23, 2018 :
    Thats correct. With my manual settings the correct exposure took place. Auto exposure took in more light and resulted in over-bright RAW capture.
     

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  18. ZiiVic94
    Gingerbread Jun 23, 2018


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  19. hassan987
    Gingerbread Jun 24, 2018

    Last edited: Jun 24, 2018

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  20. ZiiVic94
    Gingerbread Jun 24, 2018

    ZiiVic94 , Jun 24, 2018 :
    I am saying that you obtained 10X less iso because of slower shutter.
     

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