色の重ね合わせとカラーホイール
3つの色がどう重なるか：黒背景の加色 RGB（赤+緑+青=白）と白背景の減色 HSB、さらに360°色相環。
どんなツールか
On a black screen, colored light adds up: red + green = yellow, green + blue = cyan, red + blue = magenta, and all three together = white. On white paper, inks subtract: overlapping filters darken toward black. The 360° wheel shows every hue around the circle.
豆知識・雑学
Additive color mixing was formalized by James Clerk Maxwell in 1861 with his three-color photograph. Subtractive mixing is how paint, ink and filters work. The hue wheel has been the standard way to visualize color order since Newton.
由来と歴史
Newton's color circle (1666) was the first hue wheel. Maxwell's 1861 tartan ribbon demonstrated RGB additive mixing. Modern color wheels in design software (Photoshop, Figma) descend from these diagrams.
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