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Use modelid to set color gamut #9

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hobinjk opened this issue Feb 8, 2018 · 1 comment
Open

Use modelid to set color gamut #9

hobinjk opened this issue Feb 8, 2018 · 1 comment

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@hobinjk
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hobinjk commented Feb 8, 2018

Set the color gamut in cssToXYBri and xyBriToCSS using this formula:
https://developers.meethue.com/documentation/color-conversions-rgb-xy
and this modelid-derived data:
https://developers.meethue.com/documentation/supported-lights
@hobinjk
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hobinjk commented Feb 12, 2018

The issue I encountered with the unconstrained gamut was the brightness level (Y) suggested by the formula being far lower than it should be. I think with constraints the proper approach is

  1. get X Y Z and x y z from color
  2. constrain x and y to gamut
  3. get z' from x' and y'
  4. use Z/z' to scale y' into Y'

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