Thread: BMMCC FPN update?

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  1. #1 BMMCC FPN update? 
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    Googling around a little and noticed a few threads about FPN issues in the shadows of the micro, these threads are about a year old now and I was wondering if there was ever an update to address the issue or should I inspect my micro more thoroughly?

    Thought I'd just ask because I saw some of your names come up with the same issues.
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  2. #2  
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    No fpn issues here. Although people will always look for reasons not to just shoot
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  3. #3  
    Senior Member shijan's Avatar
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    The only current solution is to set x/y position in timeline (or pan/tilt in color page) to 0.5px. Works perfect. Always use it.
    BTW in 14 beta this trick produces strange pixel lines at the frame edges. Hope they fix it in final release
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  4. #4  
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    Quote Originally Posted by shijan View Post
    The only current solution is to set x/y position in timeline (or pan/tilt in color page) to 0.5px. Works perfect. Always use it.
    BTW in 14 beta this trick produces strange pixel lines at the frame edges. Hope they fix it in final release
    how does this work exactly?
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  5. #5  
    Senior Member Tomas Stacewicz's Avatar
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    Quote Originally Posted by shijan View Post
    The only current solution is to set x/y position in timeline (or pan/tilt in color page) to 0.5px. Works perfect. Always use it.
    BTW in 14 beta this trick produces strange pixel lines at the frame edges. Hope they fix it in final release
    Yeah, could you make a tutorial or something?
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  6. #6  
    Senior Member shijan's Avatar
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    What tutorial ? Just set image position to 0.5 in every clip. This removes Cross Hatching pattern and in addition works as very light OLPF filter.
    For RAW it works in both "Edit" or "Color" page for ProRes it works only in "Color" page. Check thread "Cross Hatching Wont Go Away" on forum.blackmagicdesign.com all main info about this problem collected here.

    Screen-Shot-2017-05-02-at-6.05.59-PM.jpgScreen-Shot-2017-05-02-at-6.06.18-PM.jpg
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  7. #7  
    Senior Member shijan's Avatar
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    and just copy paste of summary info from that long thread:

    1. Wrong debayering of second green pixel produces semy-invisible fixed pixel grid which is partially hidden under the sensor noise. As a result at some zoom or scale levels in various players and apps this invisible grid may produce highly visible cross-hatch moire-like pattern.
    2. Depending of image contrast, added sharpen and noise reduction amount, and player scaling method this pattern may be visible or not visible at all.
    3. In BMMCC which is limited to 1920x1080 resolution this makes sensor Noise and FPN more visible (it behaves like some kind of shadow noise and FPN sharpening, adds additional digital artifacts to noise texture) and this limits the amount of visually usable shadow details.
    4. People noticed this effect in BMPCC and BMPC cameras. In BMPCC it is harder to see because it is slightly noisier than BMMCC and pixel pattern more hidden under the noise.
    5. This effect depends of camera firmware version.
    6. This problem can be fixed with fix in CornerFix app https://sites.google.com/site/cornerfix ... patterns-1 with applying a BayerGreenSplit500.cpf settings. This fix works only in ACR. All other RAW processing apps ignores it.
    7. BM support team answer: "this is currently under investigation by our Development team"
    8. BM team RMA few cameras but results are random and not perfect.
    9. As a temporary solution for this problem shifting image position by setting X Y position to 0.5 works very well (note that in Resolve this works only with RAW footage, but in Adobe apps it works with both ProRes and RAW footage)
    UPDATE: In Resolve, simply use the "pan/tilt" setting in the Color Tab (same values of 0.5 each), instead of "xy position" in the inspector. Should work for ProRes-Footage as well ...
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  8. #8  
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    I have noticed the FPN a year ago at first try, but magically it has gone. Don't see it anymore.
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  9. #9  
    Senior Member Liszön!'s Avatar
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    shijan, you are confusing FPN and cross hatching, two different issues.
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  10. #10  
    Senior Member Tomas Stacewicz's Avatar
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    I haven't noticed any cross hatching issues with my BMPCC. Only some FPN in extremely underexposed shots. (I know it's a thread about the BMMCC, however it shares its sensor with the BMPCC, so I though it applied here as well.)
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