colorsys --- 顏色系統間的轉換

原始碼：Lib/colorsys.py

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The colorsys module defines bidirectional conversions of color values between colors expressed in the RGB (Red Green Blue) color space used in computer monitors and three other coordinate systems: YIQ, HLS (Hue Lightness Saturation) and HSV (Hue Saturation Value). Coordinates in all of these color spaces are floating-point values. In the YIQ space, the Y coordinate is between 0 and 1, but the I and Q coordinates can be positive or negative. In all other spaces, the coordinates are all between 0 and 1.

也參考

有關色彩空間的更多資訊請見 https://poynton.ca/ColorFAQ.html 和 https://www.cambridgeincolour.com/tutorials/color-spaces.htm。

colorsys 模組定義了以下函式：

colorsys.rgb_to_yiq(r, g, b)

將顏色自 RGB 座標轉換至 YIQ 座標。

colorsys.yiq_to_rgb(y, i, q)

將顏色自 YIQ 座標轉換至 RGB 座標。

colorsys.rgb_to_hls(r, g, b)

將顏色自 RGB 座標轉換至 HLS 座標。

colorsys.hls_to_rgb(h, l, s)

將顏色自 HLS 座標轉換至 RGB 座標。

colorsys.rgb_to_hsv(r, g, b)

將顏色自 RGB 座標轉換至 HSV 座標。

colorsys.hsv_to_rgb(h, s, v)

將顏色自 HSV 座標轉換至 RGB 座標。

範例：

>>> import colorsys
>>> colorsys.rgb_to_hsv(0.2, 0.4, 0.4)
(0.5, 0.5, 0.4)
>>> colorsys.hsv_to_rgb(0.5, 0.5, 0.4)
(0.2, 0.4, 0.4)