Resources

Package inspiration comes from desire to generate a color scheme with minimal user input in WordPress customizer

• http://celloexpressions.com/blog/a-strategy-for-custom-colors-in-the-customizer/

In-browser color conversion and SASS compilation

• http://rgb.to
• http://www.sassmeister.com/
• http://springmeier.org/www/contrastcalculator/index.php

Similar packages/inspiration

• https://github.com/mexitek/phpColors
• https://github.com/spatie/color
• https://github.com/hasbridge/php-color
• https://github.com/PrimalPHP/Color
• https://github.com/ProjectCleverWeb/PHP-Color

And in JS

• http://linkbroker.hu/stuff/kolorwheel.js/
• https://github.com/brehaut/color-js
• https://github.com/Qix-/color
• https://github.com/niftynei/color-wheel
• https://github.com/carloscabo/colz

On colors, accessibility https://www.imagemagick.org/Usage/color_basics/ https://www.w3.org/TR/AERT#color-contrast

About "perceived brightness"

• https://stackoverflow.com/questions/1855884/determine-font-color-based-on-background-color
• https://stackoverflow.com/questions/596216/formula-to-determine-brightness-of-rgb-color
• http://alienryderflex.com/hsp.html

On colorspace conversion, mixing colors

• http://www.niwa.nu/2013/05/math-behind-colorspace-conversions-rgb-hsl/
• https://stackoverflow.com/questions/398224/how-to-mix-colors-naturally-with-c