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Clarify rgb to hs/xy color conversion (#961)

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Erik Montnemery 2021-06-07 11:26:45 +02:00 committed by GitHub
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docs/core/entity/light.md
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@ -43,7 +43,7 @@ A light entity controls the brightness, hue and saturation color value, white va
Note that in color modes `COLOR_MODE_RGB`, `COLOR_MODE_RGBW` and `COLOR_MODE_RGBWW` there is brightness information both in the light's `brightness` property and in the color. As an example, if the light's brightness is 128 and the light's color is (192, 64, 32), the overall brightness of the light is: 128/255 * max(192, 64, 32)/255 = 38%.
If the light is in mode `COLOR_MODE_HS`, `COLOR_MODE_RGB` or `COLOR_MODE_XY`, the light's state attribute will contain the light's color expressed in `hs`, `rgb` and `xy` color format. Note that information is lost when the light is in mode `COLOR_MODE_RGB` as `hs` and `xy` don't hold brightness information.
If the light is in mode `COLOR_MODE_HS`, `COLOR_MODE_RGB` or `COLOR_MODE_XY`, the light's state attribute will contain the light's color expressed in `hs`, `rgb` and `xy` color format. Note that when the light is in mode `COLOR_MODE_RGB`, the `hs` and `xy` state attributes only hold the chromaticity of the `rgb` color as the `hs` and `xy` pairs do not hold brightness information.
If the light is in mode `COLOR_MODE_RGBW` or `COLOR_MODE_RGBWW`, the light's state attribute will contain the light's color expressed in `hs`, `rgb` and `xy` color format. The color conversion is an approximation done by adding the white channels to the color.