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4k crop and zoom for stills.

Discussion in 'Pro/Adv Discussion' started by SnoozeDoggyDog, Jul 23, 2015.

  1. SnoozeDoggyDog

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    Hi
    Can anyone please help me? What is the detail attainable from a still taken from a grab of 4k footage. I only have a p3a so can't test myself.

    Eg, I'm looking for a missing person and I'm at an altitude of 200ft. I take 4k video of an area. I play it back and take a screen grab. What is the detail when zooming into the captured still?

    If anyone could provide me with examples to a gdrive/Dropbox that would be fantastic.

    Thanks
     
    #1 SnoozeDoggyDog, Jul 23, 2015
    Last edited: Jul 23, 2015
  2. Meta4

    Meta4 Moderator
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    If you use software to extract a still from 4K video it is 8MP as against the 12MP you get for a still.
    If you just get a screen shot, that will depend on your video card resolution but will be much less - probably 2MP or so.
     
  3. SnoozeDoggyDog

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    Ah OK, that answered things. Thanks. In that case I'll do some stills testing with my p3. Thanks.

    Phil
     
  4. taroh

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    Crop from wide angle pics, be careful to perspective correction (unless you zoom into the center). Since the edge of the picture distorts, simply crop a part won't be the same as zoom. Photoshop (still) or Premiere (footage) have perspective correction, as many other post process softwares.
     
  5. jadebox

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    Note also that video tends to be captured with a lower shutter speed so there's more motion blur. Stills captured from video are never as good as real stills. Having said that, though, I've taken stills from 4K video that look pretty good. For most uses, especially displaying on the web, they are fine.

    -- Roger
     
  6. SnoozeDoggyDog

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    Thanks for the replies. I was asking mainly about stills from 4k movie footage as I may capture something on video that isn't always noticeable to frame a still for. But if stills are the best way to go then I'll have to rethink. Hopefully Litchi will be able to develop a compatible p3a version after the firmware release. Time lapse stills might be my better option.
     
  7. Opman711

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    ImageUploadedByPhantomPilots1437675928.131640.jpg

    I was able to get this screen capture from video shot in 4k. I'm pretty impressed with the quality. Keep in mind the actual quality is better than what is uploaded to the forum.
     
    skyhighdiver and Oso like this.
  8. jadebox

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    A lot of it depends on specifically what you are trying to capture. I've been recording model rocket and high-power rocket launches. I can usually get nice stills using the "burst mode" which takes multiple images quickly. But, I can always get nice video of the launches.

    I try to mix it up - capturing videos and stills. Sometimes, I'll extract stills from the video and, often, I will use the stills in videos I produce. It's really nice to be able to control the camera and choose what you want to do while the 'copter is in the air!

    -- Roger
     
  9. SnoozeDoggyDog

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    I'll get out and do some testing tonight shooting stills. It certainly looks great quality stills taken from 4k.
     
  10. SnoozeDoggyDog

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    Is it just me or is there no burst mode on the P3A?I can't find it in the settings?! My P2V+ had it!
     
  11. SnoozeDoggyDog

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    Don't worry, found it. Thanks
     
  12. Dave Ward

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    One thing to keep in mind about video stills vs. photos is shutter speed. In good light, video will ideally have a much longer shutter speed than stills, to blur one frame into the next. If a sharp still is important, using the photo mode will produce much better results than a still capture from a video.
     
  13. 4wd

    4wd

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    They are quite good, most people would never realise it was not taken as a jpg.
    This is a screen grab taken viewing 4K file in VLC player.
    Original was about 8MB

    [​IMG]
     
  14. SnoozeDoggyDog

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    God! My still aren't as good as your still from video! I'm really struggling. I've been out tonight and binned everything I've snapped. Fuzzy rubbish. I really really need to hit the camera specific threads.
     
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  15. SnoozeDoggyDog

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    Lol just realised you said it's a jpg from 4k grab ... that's even more depressing. I've been shooting raw all night :confused:
     
  16. Dave Ward

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    It's quite a bit harder to get good photos (or video) at night vs. day. Your exposure time is going to be longer at night and much more prone to blurry results if the Phantom moves a bit during the exposure.

    At night, the key for me has been to wait until the h/s and v/s indicators in the Pilot app have been at 0.0 for a couple seconds before hitting the button to take a photo. The gimbal is so good that it can seem like the view is stationary while the Phantom is still slightly drifting to a stop.
     
  17. jasonb777

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    I don't really know alot about settings but I got this yesterday with the color set to vivid and using a 16PL polarpro filter DJI_0012.JPG