Do you think an extraction of a single frame from a 4K video suffers any degredation?
I was playing around with the idea of extending my focal length by shooting a 4K video (which has a crop factor of about 3.2), and then extracting a single frame.
I wondered if the image quality suffers any.
Steve Thomas
Hmmmm... I accidentally dropped a C in the title, but I can't go back and edit the title. I can edit the body, but not the title.
You should be able to edit the title, I've done it before, on the right side should be a cogwheel, hover over it and it will show "Thread options"
That worked. Thank you Photobygms.
Steve Thomas
It could suffer depending on the shutter speed used to record the video and how fast any movement in the scene was for that frame. Normally you set the shutter speed to be 1/(2 x fps). So if you're recording 30fps the shutter speed would be 1/60s. If 1/60s is fast enough to freeze any important motion in the frame then the extracted frame should be ok.
set video to shutter priority and set it to what ever speed you need to still the action. i do it all the time, you will get great 8m images.
DannoB and DonaldB
Thanks guys. My shutter speed is OK. Mostly I wondered if the image quality would suffer any during the frame extraction process. Based on what you guys said, It doesn't sound like it would.
Thanks again.
Steve Thomas
Image quality suffer to some extent because of high compression of video stream. But the frames are usable. And this is only valid for very high quality 4K video clips.
Same cropped areas from normal pictures are better regarding fine details.
The quality of the 4K image also depends on the model of the camera used.
Some cameras offer poor to very poor quality in 4K video. So individual frames are poor quality, not comparable with crops from normal frames.
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An example says all. Canon R6II, best picture quality vs an extracted frame (from Dpreview tests).
3DGunner,
I don't know if my T8i will compare with your R6. I'll have to experiment some.
Your pictures looked pretty good.
Thank you.
Steve Thomas
I used a comparison in the case of R6 II because that's what I found easily to show you a concrete example relative to the topic.🙂
(I'm using Sony cameras which can give very good 4K videos)
The extracted files will be 8mp, but it is going to be a jpg, so not much room for post-processing. I have done that before (extracting stills from video commercials for newspaper print ads) but still images look always better.
