5 ms·

4K is 3840*2160 = roughly 8.3 megapixels.

by einr 5y ago

coldtea 5y ago
Hmm, had in mind DCI which consider quite larger than UHD 4K, but yes, it's still ~ 9MP.
BoorishBears 5y ago
Yeah, and now if something doesn't have enough to do 4k there's: a) nothing stopping them from faking it, plenty of crappy hardware will record files in an upscaled resolution (see webcams especially for this) b) you probably don't want a larger version of the output of that device anyways. I mean even a 130 dollar phone has a 13 megapixel camera. https://www.amazon.com/BLU-Android-Factory-Unlocked-Display/dp/B0844S4JVF https://www.amazon.com/BLU-Android-Factory-Unlocked-Display/...
fouc 5y ago
> YouTube, since 2010,[51] and Vimeo allow a maximum upload resolution of 4096 × 3072 pixels (12.6 megapixels, aspect ratio 4:3) I guess it really depends on the aspect ratio you're going for. https://en.wikipedia.org/wiki/4K_resolution#Video_streaming https://en.wikipedia.org/wiki/4K_resolution#Video_streaming
- einr 5y ago
  I've never personally seen that resolution used, nor called "4K". If you're going to lump together a resolution with 50% more pixels under the same umbrella term then IMO "4K" is meaningless and we need more granular terminology.
jychang 5y ago
That's at a 16:9 video ratio though. There are no phone camera sensors out there with a 16:9 ratio. That would be useless for taking still photographs. Most DSLR/mirrorless cameras have a 3:2 ratio, whereas smartphone cameras tend to have a 4:3 ratio. If you want to make a smartphone camera sensor that can do 3840 pixels across that can shoot 4k, the 4:3 sensor would need to be 2880 pixels tall. So 3840*2880 = 11.1MP would be the bare minimum size for a smartphone camera that can shoot 4K. In practice you'd want something larger than that, so you can do DCI 4K (which is a bit higher resolution) and do things like gyroscopically assisted electronic image stabilization (which benefits from a few extra pixels around the border). The iPhone can probably implement video stabilization that rivals GoPro's HyperSmooth stabilization.

4K is 3840*2160 = roughly 8.3 megapixels.

by einr 5y ago

4K is 3840*2160 = roughly 8.3 megapixels.

coldtea 5y ago

Hmm, had in mind DCI which consider quite larger than UHD 4K, but yes, it's still ~ 9MP.

BoorishBears 5y ago

Yeah, and now if something doesn't have enough to do 4k there's: a) nothing stopping them from faking it, plenty of crappy hardware will record files in an upscaled resolution (see webcams especially for this) b) you probably don't want a larger version of the output of that device anyways. I mean even a 130 dollar phone has a 13 megapixel camera. https://www.amazon.com/BLU-Android-Factory-Unlocked-Display/dp/B0844S4JVF https://www.amazon.com/BLU-Android-Factory-Unlocked-Display/...

fouc 5y ago

> YouTube, since 2010,[51] and Vimeo allow a maximum upload resolution of 4096 × 3072 pixels (12.6 megapixels, aspect ratio 4:3) I guess it really depends on the aspect ratio you're going for. https://en.wikipedia.org/wiki/4K_resolution#Video_streaming https://en.wikipedia.org/wiki/4K_resolution#Video_streaming

einr 5y ago
I've never personally seen that resolution used, nor called "4K". If you're going to lump together a resolution with 50% more pixels under the same umbrella term then IMO "4K" is meaningless and we need more granular terminology.

jychang 5y ago

That's at a 16:9 video ratio though. There are no phone camera sensors out there with a 16:9 ratio. That would be useless for taking still photographs. Most DSLR/mirrorless cameras have a 3:2 ratio, whereas smartphone cameras tend to have a 4:3 ratio. If you want to make a smartphone camera sensor that can do 3840 pixels across that can shoot 4k, the 4:3 sensor would need to be 2880 pixels tall. So 3840*2880 = 11.1MP would be the bare minimum size for a smartphone camera that can shoot 4K. In practice you'd want something larger than that, so you can do DCI 4K (which is a bit higher resolution) and do things like gyroscopically assisted electronic image stabilization (which benefits from a few extra pixels around the border). The iPhone can probably implement video stabilization that rivals GoPro's HyperSmooth stabilization.