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Hex Color Codes

Hex: What and Why?

• Hexadecimal (hex) is a base-16 number system, which requires 16 digits:
  

  0 1 2 3 4 5 6 7 8 9 A B C D E F
  

• Hex is convenient for representing binary data because 16 = 2⁴ is an exact power of 2. Therefore, each hex digit is can be represented by four binary digits (bits).
   
• Here are the representations of the hex digits in base-10 (decimal) and binary.
   
• A Hex to Decimal Conversion Table.

Comparing Two-digit Hex Numbers

• (d₁ d₂) _hex > (e₁ e₂) _hex if d₁ > e₁ or if d₁ == e₁ and d₂ > e₂.
   
• Which hex number from each pair is larger?

  56 6A   B2 A8   D6 DE   23 2B
  

Decimal and Hex Color Codes

• CSS accepts decimal color codes. For example:

  body  { background-color: rgb(240,240,255);
          color:rgb(0,0,180); }
  

• Traditionally, color codes are represented in hex.

  body  { background-color:#F0F0FF; color:#0000B4; }
  

• In the hex color code #F0F0FF, F0 is the red component, F0 is the green component, and FF is the blue component.