Why can a digitally zoomed video frame look sharper than a higher-resolution still photo?
Asked 3/20/2025
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2 answers
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I tested my Canon EOS R10 with an EF-S 55-250mm STM at 250mm on a tripod and noticed something unexpected: a frame extracted from 1920×1080 video recorded with the camera’s built-in digital zoom looks sharper than a crop from a 24MP still photo.
Both were shot at about the same settings:
- still photo: 1/30, f/5.6, ISO 6400, 250mm
- video: 1920×1080, 1/30, f/5.6, ISO 6400, 250mm with digital zoom
Since the still image has much higher resolution, I expected it to retain more detail than an HD video frame. Instead, the still crop looks softer.
What could explain this? Is the camera doing extra processing in video mode, or is this more likely caused by focus, noise reduction, or something else?
Originally by Hawking S. Source · Licensed CC BY-SA 4.0
Hawking S
1y ago
2 Answers
3
Judging by just these two crops without original samples the most reasonable explanation is that either the focus shifted or the still shot had too high ISO (therefore having too much noise which got removed together with fine image details).
I've never dealt with video recording but modern video processing is very likely to use temporal noise reduction so even though video exposure is same the noise may still be reduced compared to single image, more so if the object is stationary and/or tripod is used.
Judging by similarity of noise on the even surfaces the focus shift is the most likely explanation.
After you've added the original raw file the noise is very apparent on the black seat. However, it turns out it is indeed focus shift.
There is a nice patch of grass which looks best in the corner of the image (and it is in front of the bike) meaning that you were not well-focused. It's slightly soft but it's natural for a lens to have softer corners. Sharp field is not deep at 375mm F8 equivalent for this focusing distance.
Focus position is obvious when comparing patches of grass (different zoom levels):
Behind the bike: 
Next to the bike: 
In front of the bike: 
Originally by Euri Pinhollow. Source · Licensed CC BY-SA 4.0
Euri Pinhollow
1y ago
0
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The most likely explanation is not that digital zoom improved detail, but that the still photo was slightly out of focus while the video frame was better focused.
From the shared crops/raw, focus shift appears to be the main cause. At 250mm, f/5.6, and 1/30s, even a small focus difference can make a high-resolution still look soft.
A second factor is processing: video often uses stronger noise reduction, and may also use temporal noise reduction across adjacent frames. On a tripod with a mostly static subject, that can make a video frame look cleaner and apparently sharper than a single ISO 6400 still, where noise and noise reduction can smear fine detail.
So the HD frame is not truly capturing more detail than the 24MP photo. It likely looks better because:
- the still image focus was slightly off, and/or
- video processing reduced noise and increased apparent sharpness.
In principle, a properly focused 24MP still should outperform an extracted 1080p video frame.
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UniqueBot
AI1y ago
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