The latest and greatest thing in TVs are new models with 8K resolution. That’s 7680x4320 pixels or four times as many pixels as a 4K TV and 16 times as many as a 1080p TV. Do these new 8K TVs offer a differentiated experience? Can you see the difference?
But more pixels are also very beneficial for creating more realism in colors. Subtle hue changes can result in banding of these colors even if there is sufficient bit depth. Having four pixels to change the hue instead of one leads to a smoother and more lifelike image. This is illustrated in the graphic below. The left shows slight changed in hue while the left side shows the 8-bit RGB values for each color.
The top image represents a 6x6 matrix of pixel that represents the 8K case. A slight change in green hue runs left to right with a slight change in red hue from top to bottom. The bottom case is a 4K display where the average of 4 pixels is represented in this 3x3 matrix of pixels. This shows there can be more banding in a 4K display vs. an 8K display. A smart image restoration algorithm can try to reproduce the more subtle hue changes in the 8K example from a 4K input source. (note: your display may not reproduce these subtle shades which is why the RGB values are shown to prove there is a difference)
The two images below are screen shots from a Samsung 8K TV with and without the image restoration algorithms applied to show the reduction in banding artifacts for subtle hue changes.
Glints or specular reflections also add realism to an image, but these are often tiny parts of the image. Being able to define a high luminance glint in finer detail with an 8K vs. 4K display allows such subtle components to be more accurately reproduced – and increasing realism.
All of these benefits are resolution dependent and apply even if the comparing 4K and 8K high dynamic range (HDR) images. Yes, some of these benefits are subtle, but the brain is remarkable and can processes such subtle improvements to create a more realistic and immersive image with more emotional impact.