Nihiluum @ 03/27/18, 10:00 PM
for $ 2k, moreover they downscale from 6k to 4k, as a result of which we get an ultra clear picture
What kind of camera are we talking about? Are there cameras that have 4K down to a good 1080p downscale? So from the reviews, I see that 1080p video in 4K photo / video cameras is not better, or even slightly worse than their predecessors with 1080p.
At the expense of real resolution - if the matrix consisted of 3840 Г— 2160 color photodiodes, then this would be 100% real 4K (Ultra HD) resolution.
But all the matrices h / b, and each pixel image is formed from several subpixels (photodiodes with color filters, which are not fixed color, and the level of illumination). If I remember correctly, then 1 pixel consists of 4 subpixels, the green / red / blue light filter is above each subpixel. As a result, if 20mm is stated in the chamber, then it is 20 million subpixels, of which for example 10 million. Green, and on 5mln. Blue and red. In fact, everything is more complicated, there is an interpolation from neighboring "pixels".
And for this reason, a downscale in a 4K video editor up to 1080p gives much better quality than 1080p from the same camera.