Originally posted by NorBro
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Originally posted by NorBro View PostWhat is 4K?
What does that word mean to you?Last edited by Donny 123; 05-10-2021, 01:26 AM.
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Originally posted by CharlesPapert View PostAll of these numbers are virtually arbitrary. If UHD was 4096 across and DCI was cropped from that and both versions were presented side by side, it's incredibly unlikely anyone would detect the difference of like 100 pixels out of 4000, even projected in a theatre. Netflix calls 3840 UHD "true 4k"...why sweat it?!Last edited by Donny 123; 05-10-2021, 01:51 AM.
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Originally posted by JPNola View PostThen why are “ 3840x2160 ” and “ 4096x2160” referred to as aspect ratios?
Originally posted by JPNola View PostBecause my strength is not video engineering but shooting and lighting.
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Originally posted by Doug Jensen View PostI have never once heard a fellow professional, until now, refer to either of those numbers as aspect ratios. They are resolutions and everyone I work with knows the difference.
Well, I guess that sets you apart from the rest of us who don't have those skills, but I really don't think these simple concepts of resolution and aspect ratios are rocket science, brain surgery, or require a degree in video engineering.Sachtler tripod user for 40+ years.
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If resolution and aspect ratio are unrelated, then any given aspect ratio can be any given resolution. But I am being told that 4096x2160 cannot be 16x9.
This chart, https://www.wearethefirehouse.com/as...io-cheat-sheet, links aspect ratios to specific resolutions, suggesting to me that aspect ratio and resolution do have something to do with each other and are not wholly unrelated to each other, as posited here in an earlier post.
If true that aspect ratio and resolution are unrelated, a 4:3 aspect ratio could have a resolution of 4096x1716. Is that the case?
Sony apparently think the two are related:
“ Resolution and aspect ratio are terms used to describe the format and image you see on your television screen. In a television, these two values are related and one affects the other.”
https://www.sony-latin.com/en/electr...icles/00105548
Then there is this:
“ I am sure some of you already know that the term "resolution" isn’t correct when it’s used to refer to the number of pixels on a screen. That says nothing about how densely the pixels are clustered. "Resolution" is technically the number of pixels per unit of area, rather than the total number of pixels. ”
“simple concepts”? Well, that is matter of opinion. This writer characterized it as such:
“ Conclusion – It’s is all a confusing mess.
If you are not very technical, it is very likely that you are confused by so many technicalities. ”
https://www.comtech-networking.com/b...0i-1080p-mean/Sachtler tripod user for 40+ years.
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Originally posted by JPNola View PostNothing in that post is in any way helpful or educative.
Originally posted by JPNola View PostIBut I am being told that 4096x2160 cannot be 16x9.
1920x1080 and 3840x2160 are both 16:9. Bu they are not the same resolution. Get it?Last edited by Doug Jensen; 05-10-2021, 09:45 AM.
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In no manner did I say you are obligated. I said your post was not helpful. But that isn’t saying you are obligated to be helpful. If the failure of your effort to educate frustrates you, walk away. Or do better at your effort to educate. Saying “this is all SO simple!” and suggesting the student is stupid isn’t successful educating. It helps not at all.
Why would math dictate that the resolution 4096x2160 cannot be 16x9 when YOU said “One has nothing whatsoever to do with the other.”? Now resolution does have something to do with aspect ratio? Which is it- nothing to do with each other or a “indisputable” relation determined by 5th grade math?Sachtler tripod user for 40+ years.
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They are related as mentioned multiple times in this thread...
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And in this conversation, based on the context, only the total number of pixels matter because we cannot control the arrangement of pixels in cameras.
If we're speaking about one source (one camera), the difference we see with our own eyes and what we work with in post is determined by the final number of total pixels the cameras are providing us in the files we work with.
Since the history of digital cameras, the easiest and most tried-and-true method to understand this is by zooming in and seeing the difference in the data the cameras provide us in the form of a computer file.
Now when you start comparing resolutions between different sensors from different companies, it's not as straightforward to understand because the processes in creating that data become more complicated across dozens of systems as cameras not only account for pixels but also colors and any potential visual distortions such as noise particles.
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The proportions are really important to understand...
Width x Height/Length.
1920x1080 and 3840x2160 and 7680x4320 are all 16x9 because the math is perfect.
Width:
1920 x 2 = 3840
3840 x 2 = 7680
Height/Length:
1080 x 2 = 2160
2160 x 2 = 4320
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But when you change the numbers for the width or height/length, those proportions change.
So 1920 x 1080 is 16:9.
Bump up the width to 2048 and keep the height at 1080, and 2048 x 1080 is now 17:9.
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Now if you take 2048 and multiply it by 2, you get 4096. And if you take 1080 and multiply it by 2, you get 2160.
So 4096 x 2160 is also 17:9, and it's why your camera refers to it as 17:9.
As far as cameras are concerned, when all of this stuff was being made and used, they needed to create a system/standard so people can communicate about the information and learn and exchange knowledge.
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Originally posted by JPNola View PostWhy would math dictate that the resolution 4096x2160 cannot be 16x9
ra·tio: The quantitative relation between two amounts showing the number of times one value contains or is contained within the other.
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Originally posted by NorBro View PostThey are related as mentioned multiple times in this thread...
“ This discussion boils down to two concepts: 1) Resolution and 2) Aspect Ratio.
One has nothing whatsoever to do with the other.
Why is that so difficult to understand?”
I am trying to understand how it is true that resolution and aspect ratio have nothing whatsoever to do with each other, which I am told should be easy to understand.
I’m being told both: that they have no relation AND they have an irrefutable mathematic relation.Sachtler tripod user for 40+ years.
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