The degree of brightness (lightness) in color, images, or displays — a measure of how light or bright something appears.
写真編集ソフトで明度を上げると、画像が明るくなる。
Increasing the brightness in photo-editing software makes the image lighter.
このペイントは明度が高く、壁がより明るく見える。
This paint has high lightness, making the wall look brighter.
色相や彩度と明度は、色を説明する三要素の一つだ。
Hue, saturation, and brightness (lightness) are one of the three elements used to describe color.