4K Video Frame Capture

Discussion in 'iPhone' started by jase1125, Oct 3, 2015.

  1. jase1125 macrumors regular

    Joined:
    Sep 24, 2014
    Location:
    Texas
    #1
    I'm wondering if any photography minded folks have exported a frame from a 4K video taken with the 6s Plus.... I did so using my 6s, and the results were less than positive. That could possibly be because the 6s doesn't have optical image stabilization (silly they left that out and the technical reasons stated by apple is a bit false IMO). Anyway, the possibility of extracting quality jpg's from 4K video taken with the iPhone is exciting if it works well. I know results from mirrorless and DSLR's have proven this is possible with great quality, but the iPhone is no DSLR. Hoping the OIS in the 6s Plus improves what I have been able to do with the 6s.
     
  2. redman042 macrumors 68020

    Joined:
    Jun 13, 2008
    #2
    I tried a few screenshots of a paused 4K video playing, and they were ok. But I checked the resolution in a photo app and it was only about 2k. My 6S+ must be doing some downscaling when displaying 4K video.

    I have heard of fashion photographers using 4K or 8K video cameras to shoot "stills" (by taking video of the model then capturing stills of the perfect photos later), and thought this could come in handy on the iPhone.

    I figure someone will eventually come out with an app that can extract true 4K stills.
     
  3. Small White Car macrumors G4

    Small White Car

    Joined:
    Aug 29, 2006
    Location:
    Washington DC
    #3
    The iPhone+ screen renders at 1242x2208. I'd imagine that's what you got since you were taking screen shot.

    More detail: http://www.paintcodeapp.com/news/iphone-6-screens-demystified

    You would need software that exports a whole frame out of the video if you want the full resolution.
     
  4. 321estrellas macrumors 6502

    321estrellas

    Joined:
    Sep 28, 2007
    #4
    4k photo is one of my favourite features in Panasonic mirrorless cameras. I certainly hope they add this feature in a not-so-distant iOS update.
     
  5. rocksyoursock macrumors regular

    rocksyoursock

    Joined:
    Mar 12, 2011
    #5
    This.

    Your screen cap is limited to screen resolution. Your screen isn't 4K.
     
  6. jase1125 thread starter macrumors regular

    Joined:
    Sep 24, 2014
    Location:
    Texas
    #6
    I was able to pull the full resolution screen capture. One can do this in Lightroom or photoshop. However, the actually quality of that capture was very poor. I can guess this was because I don't have OIS in the 6s, compression or software noise reduction. I suspect the only decent quality stills will require a 6s plus and shooting in daylight at base ISO.
     
  7. 321estrellas macrumors 6502

    321estrellas

    Joined:
    Sep 28, 2007
    #7
    Also, most mirrorless cameras with this function suggest that you shoot with a higher shutter speed, so that every frame is captured without or with minimal motion blur. Since the iPhone only shoots 30fps in 4k, you're bound to get motion blur in your stills.
     
  8. jase1125 thread starter macrumors regular

    Joined:
    Sep 24, 2014
    Location:
    Texas
    #8
    it is captured at 30fps, but that is different than the shutter speed. in bright daylight there is no way the shutter is only 1/30 sec or the video would be blown out. However, your point is valid in lowlight video recording.
     

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