NHK developed "GAMUT RINGS" that represents the color range of TV.Visualization of brightness in 2D

NHK技研が考案した「Gamut Rings」による色域表現。リングの面積が大きいほど、色再現範囲が広い

The NHK Broadcasting Technology Research Institute has devised a new method, "GAMUT RINGS", which expresses the color gamut (color reproduction range) performance provided by the display, such as TV and PC monitors.NHK announced in January 2021 at the International Electric Standards Meeting (IEC) that it was adopted as an international standard in November 2021 by the International Lighting Committee (CIE).In addition, a device that automatically measured the color gamut on the display was developed and displayed in a new method.

試作したディスプレイ色域自動測定装置

In the past, the color gamut was simply expressed in a triangular area on a coloring diagram, defined by the coloring point of the primary color (red, blue, and green).

従来の色度図上の色域表現。三角形の面積が大きいほど、色再現範囲が広いとされる

The conventional colored diagram is convenient for expressing it in two dimensions such as paper, but in order to correctly evaluate the color gamut on the display, it is necessary to express it with a 3D "color gamut three -dimensional" including brightness.there were.However, the color gamut solid could not be evaluated correctly unless the three -dimensional shape was a display device (such as a PC, a tablet, etc.) with a function to view from a free angle.For this reason, the development of a new two -dimensional expression method that can properly evaluate three -dimensional color gamut three -dimensional has become an issue.

色域立体の例。体積が大きいほど、色再現範囲が広い

"GAMUT RINGS" devised by NHK Giken this time expresses the color range of the display correctly by projecting a two -dimensional color range solid.

Specifically, the color gamut three -dimensional is sliced at a certain brightness interval, stretched from the lower brightness to the plane, and the higher brightness color gamut is placed in a ring.The area of the ring is proportional to the volume of the three -dimensional color range.The angle from the center represents a hue such as red, blue, and green.

ディスプレイAとBの色域を「Gamut Rings」で計測した例。従来の色度図では色再現範囲が同じに見えるが、Gamut Ringsでは差が大きいことが分かる。(ディスプレイAの方が、色再現範囲が広い。ディスプレイBは特に明度が高い場合に高い彩度が表現できない）

This method achieves visualization of the color reproduction range of the display more accurately and in an easy -to -understand manner."Because the color gamut can be evaluated correctly, it is expected to be useful for various displays and television comparison and selection from broadcasting to home use, including the design and performance evaluation of the display."GAMUT RINGS is also effective not only for display but also for correct evaluation of color reproduction range such as printers.

GAMUT RINGS's "RINGS" is derived from the appearance of a wooden stump (Annual Growth Rings).