1. The Real Reason for 4K and 8K Resolution
by Edward Reuss
While many claim that UHD (4K) resolution television
is beyond the visual acuity of the average viewer, making UHD unnecessary
over a regular HD (2K) image resolution, viewers can easily detect certain
spatial artifacts, such as edge jaggies and moiré
patterns, at HD resolutions if they know what to look for. However,
increasing the image resolution to 4 K or even 8 K, will not eliminate
these spatial artifacts. They are a result of the sampling of the image
into discrete pixels, and artifacts can occur at any resolution, even
1000K. The only way to minimize these spatial artifacts is to apply
a low-pass anti-alias filter cross the image. However at HD resolutions
the filter blurs the image, which is also perceptible.
The introduction of high-dynamic range (HDR) and
wide color gamut (WCG) formats will only enhance the impact of the spatial
artifacts.
- SMPTE Motion Imaging Journal March 2017

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Webmaster's note: For those
interested, Wikipedia has a rather superb page on resolution standards,
here: https://en.wikipedia.org/wiki/Graphics_display_resolution
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