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RGB to HEX Converter

Convert RGB and HSL colours to hexadecimal.

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Questions
How does a hex code map to RGB?
Each pair of hex digits is one channel byte: #FF8800 is red 255, green 136, blue 0. Three-digit shorthand doubles each digit, so #F80 expands to #FF8800. An eight-digit code adds an alpha byte at the end.
When should I use HSL instead?
When building a palette. HSL separates hue from saturation and lightness, so generating a lighter tint or a complementary hue is a small arithmetic change rather than guesswork across three interdependent channels.
        
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