Gradation - Kaichou

Japanese: 階調 - カイチョウ
Gradation - Kaichou
The number of shades of color or brightness. It is one of the factors that determine the image quality of displays and printers, and is used as a unit of color and brightness expression. The more shades there are, the smoother the gradation of color and brightness changes can be expressed, resulting in more natural drawings. The shades are expressed numerically, such as 2, 16, or 256 shades. In a two-tone black and white image, shades are expressed in two levels, white and black. In a color image, it indicates the accuracy of the gradation of one of the three primary colors of light, RGB. For example, if each of the three primary colors has 16 shades, the number of colors that can be expressed is 16 to the power of 3, or 4,096 colors, and if there are 256 shades, the number is 256 to the power of 3, or approximately 16.77 million colors.

Source: ASCII.jp Digital Dictionary About ASCII.jp Digital Dictionary Information

Japanese:
色や明るさの濃淡の段階数。ディスプレーやプリンターなどの画質を決める要素のひとつで、色や明るさの表現力の単位として使われる。階調が多ければ多いほど、色や明るさの変化をなめらかなグラデーションで表現でき、自然に近い描画ができる。階調は数で表され、2階調や16階調、256階調というように表現する。白黒の2階調では、濃淡を白と黒への2段階で表現する。カラー画像では、光の3原色のRGBのうち、1つの色についての階調の精度を示す。たとえば、3原色がそれぞれ16階調の場合、表現できる色数は、16の3乗の4096色、256階調なら256の3乗で約1677万色になる。

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