顏色疊加與色盤
看三個顏色如何疊加：黑底加色 RGB（紅+綠+藍=白）、白底減色 HSB，外加一個 360° 色相環任點取色。
概念
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.
描述與趣事
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.
歷史與由來
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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