What is daltonism? Detailed answer

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What is daltonism? Detailed answer

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What is daltonism?

All colors can be derived from the three primary colors: red, green, purple, or yellow, blue, and red. So, for example, the whole variety of colors of the plant world is obtained by various combinations of special granules with a pigment of only three colors: red, blue and yellow.

Thanks to the cells of the retina that are sensitive to red, green and violet light, our eyes are able to perceive the colors of the nature around us.

What happens when a person either does not perceive colors at all, or sees them in a completely different way than most? This phenomenon is called color blindness. Certain light rays, falling on the retina, do not cause in it the reaction that is characteristic of a normal eye.

Let's say a beam of red light stimulates cells that are sensitive not only to this color, but also to green.

The green beam affects the eye in exactly the same way, stimulating both the "red" and "green" parts of the retina. What does a person see when this happens? He does not distinguish between red and green, but instead sees yellow-gray. After all, when you mix red and green, you get just such a color.

But such people distinguish between blue, yellow and purple. But they can distinguish red from green only by a shade of yellow-gray.

There are people with slight deviations in the perception of colors, but they may not even be aware of it.

A colorblind person can learn at an early age to distinguish red from green, even if he sees both of these colors as yellow-gray. He does this not by color, like people with normal vision, but by tone and brightness.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

What is the difference between edible mushrooms and grebes?

The answer is that there is no difference between them! Scientifically speaking, there is no such thing as "toadstool". Many people call poisonous mushrooms grebes. Botanists do not use this term at all, and for them there is no difference between an edible mushroom and what we call grebes.

There are many ideas about mushrooms, but they are completely wrong. There are very few types of mushrooms that are poisonous. But they are really deadly. Therefore, no one should eat or even taste mushrooms until he is sure that they are not poisonous. But people do not always correctly determine the toxicity of mushrooms. For example, it is not true that all umbrella-shaped mushrooms are poisonous.

It is also not true that mushrooms are poisonous if, when they are boiled, a silver spoon darkens with which they are interfered with. Poisonous mushrooms contain such a strong poison that eating them means certain death. There is a story that Emperor Nero once poisoned a whole group of guests by treating them to poisonous mushrooms. The best way to avoid this is to eat store-bought mushrooms.

Mushrooms are in the same family as molds. Like all plants belonging to this group, they lack the green substance, chlorophyll, without which the plant cannot produce food for itself. They grow next to some other plant that has chlorophyll and are completely dependent on it. Mushrooms are very delicate plants. They are made up mostly of water, so most of them can't stand dry winds or the hot summer sun.

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Quality video streaming in 8K resolution 17.09.2019

The Israeli company Beamr, which develops video content encoding software technologies, announced an important achievement: it managed to build a system that encodes video in 8K resolution (7680 x 4320) to HEVC format (H.265) in real time. This became possible thanks to a server based on the new high-performance AMD EPYC 7742 processor from the Rome family.

The server used was based on a single 64-core 7nm EPYC 7742 processor with Zen 2 architecture, which allowed real-time encoding of an 8K video stream at 79 frames per second with a 10-bit color representation required for HDR. But this achievement was made possible not only thanks to high-performance equipment. Beamr 5's H.265 encoding software, developed by Beamr, has also contributed to the success. It received special optimizations for the full use of all 128 EPYC 7742 threads, which made it possible to fully load the computing power of the server used.

The ability to encode 8K HDR video in real time is not just a demonstration of the success of AMD and Beamr. This achievement has great practical value, since 8K TVs have already begun their journey to the market. Now delivering streaming content to such devices is greatly simplified, as it can be prepared using one small server based on a single processor with a TDP of 225W. As Beamr expects, such technology of broadcasting in 8K resolution may be in demand as early as next year - during the Summer Olympics in Tokyo.

EPYC's high-performance multi-core processors are good for more than just live streaming and TV. Systems based on them can be used to build video-on-demand services, for cloud game streaming platforms, etc. With the release of the EPYC generation of Rome, these services may begin to think about moving to higher resolutions, including the highest version of 8K today.

The widespread adoption of 8K content transmission will be hampered for a long time by the limited bandwidth of network connections and the insufficient distribution of 8K TVs. However, as follows from the Beamr announcement, EPYC is at least capable of solving the issue of generating such content on the transmitting side. One way or another, this will give a certain impetus to the development of the industry in the direction of growth in permits.

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