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Improve Formula for Display Colours (#2375)

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* Update luminance formula

Following #2315 this updates the formula for computing the luminance
of a brand colour and selecting the appropriate colour class.

--

Co-Authored-By: Peter Noble <PeterShaggyNoble@users.noreply.github.com>

* Update luminance threshold from 210 to 160
This commit is contained in:
Eric Cornelissen 2020-01-23 00:34:49 +02:00 committed by Lucas Becker
parent 20a09155bc
commit 4d1b1db1bd
1 changed files with 7 additions and 19 deletions
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26
index.html
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@ -98,26 +98,14 @@
{% assign rgbMin = rgbBlue %}
{% endif %}
{% if rgbRed <= 0.03928 %}
{% assign lRed = rgbRed | divided_by: 12.92 | times: 0.2126 %}
{% else %}
{% assign lRed = rgbRed | times: 0.3053 | plus: 0.6822 | times: rgbRed | plus: 0.0125 | times: rgbRed | times: 0.2126 %}
{% endif %}
{% if rgbGreen <= 0.03928 %}
{% assign lGreen = rgbGreen | divided_by: 12.92 | times: 0.7152 %}
{% else %}
{% assign lGreen = rgbGreen | times: 0.3053 | plus: 0.6822 | times: rgbGreen | plus: 0.0125 | times: rgbGreen | times: 0.7152 %}
{% endif %}
{% if rgbBlue <= 0.03928 %}
{% assign lBlue = rgbBlue | divided_by: 12.92 | times: 0.0722 %}
{% else %}
{% assign lBlue = rgbBlue | times: 0.3053 | plus: 0.6822 | times: rgbBlue | plus: 0.0125 | times: rgbBlue | times: 0.0722 %}
{% endif %}
{% assign luminance = lRed | plus: lGreen | plus: lBlue %}
{% if luminance >= 0.83 %}
{% assign class = "grid-item--dark" %}
{% else %}
{% assign redLuminance = rgbArray[0] | times: 16 | plus: rgbArray[1] | times: 0.299 | round: 0 %}
{% assign greenLuminance = rgbArray[2] | times: 16 | plus: rgbArray[3] | times: 0.587 | round: 0 %}
{% assign blueLuminance = rgbArray[4] | times: 16 | plus: rgbArray[5] | times: 0.114 | round: 0 %}
{% assign luminance = redLuminance | plus: greenLuminance | plus: blueLuminance %}
{% if luminance < 160 %}
{% assign class = "grid-item--light" %}
{% else %}
{% assign class = "grid-item--dark" %}
{% endif %}
{% assign hslLuminance = rgbMax | plus: rgbMin | times: 50.0 %}