A color attribute, which indicates the brightness of an object's color. Color has three attributes: brightness, hue (red, green, blue, etc.), and chroma (color saturation). Both chromatic colors (colors with a hue) and achromatic colors (white, gray, black) have brightness. In the Munsell color system used to indicate color, brightness is expressed by the Munsell value (symbol V). V is set to 10 for white with a luminous reflectance (symbol Y) of 102.56%, 0 for black with a luminous reflectance of 0%, and the values between them are scaled in equal steps, such as 9, 8, ..., 1, according to the perception of brightness. The achromatic color scale, created by arranging achromatic color chips in a row in the order of V, is useful for determining the brightness of an object's color, like a ruler for length. [Takashi Azuma] [Reference item] |Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend |
色の属性の一つで、物体色の明暗を表すこと。色には明度、色相(赤、緑、青など)および彩度(色の飽和性)という三属性があり、明度は有彩色(色相のある色)にも無彩色(白、灰色、黒)にもある。色の表示に使われるマンセル表色系では、明度をマンセル・バリュー(記号V)で表す。Vは、視感反射率(記号Y)が102.56%の白を10とし、0%の黒を0として、その間を明るさ感覚に従って9、8、……、1のように等歩度に刻む。無彩色の色票をVの順に一列に並べてつくった無彩色スケールは、あたかも長さに対する物差しのように、物体色の明度を判定する場合に役だっている。 [東 尭] [参照項目] |出典 小学館 日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について 情報 | 凡例 |
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