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The Ultimate Guide to Colour Systems: Hex Codes, Pantone, CMYK, and RGB

Colour plays a crucial role in branding, design, and communication. Whether you’re building a website, printing marketing materials, or creating a product, choosing the right colour system ensures consistency and accuracy across all platforms. Four of the most common colour systems are Hex codes, Pantone colours, CMYK, and RGB.

In this guide, we’ll break down each system, explain where they are used, and help you decide which one is best for your project.

What Are Colour Systems and Why Do They Matter?

A colour system is a method of defining and reproducing colours. Since colours can appear differently depending on the medium (print, screen, fabric, paint), designers, printers, and developers rely on standardised systems to ensure consistency.

Without these systems, a brand’s signature blue might look vibrant on a website but dull in print, or a logo might shift shades depending on the screen.

That’s where Hex, Pantone, CMYK, and RGB come in.

Hex Codes: The Language of Web Colours

  • What it is: A hex code is a six-digit combination of numbers and letters (e.g., #FF5733) that represents a colour in web design.
  • Where it’s used: Websites, digital platforms, app design, and anything displayed on screens.
  • How it works: Hex codes are shorthand for RGB values but written in hexadecimal format.
  • Example: #000000 = black, #FFFFFF = white.
Colourful swirls
Colourful swirls
Colourful paints piled up
A burst of colour in paint
Colourful layered swirls
Colourful layered swirls
Colourful swirls pattern
Colourful powder paint burst

RGB: Red, Green, Blue for Digital Displays

  • What it is: RGB stands for Red, Green, and Blue. It’s an additive colour system where light is combined in different intensities to create colours.
  • Where it’s used: Screens—monitors, TVs, smartphones, and digital graphics.
  • How it works: Each colour is represented by three numbers (0–255). For example, RGB(255, 0, 0) = pure red.

RGB is perfect for digital-first projects where colours must be bright, vibrant, and backlit.

CMYK: Cyan, Magenta, Yellow, and Black for Print

  • What it is: CMYK is a subtractive colour model used in printing.
  • Where it’s used: Flyers, brochures, packaging, posters, and anything printed with ink.
  • How it works: Printers combine cyan, magenta, yellow, and black inks in varying percentages to produce colours.
  • Example: C=100 M=0 Y=0 K=0 = pure cyan.

Pantone: The Gold Standard of Colour Matching

  • What it is: Pantone Matching System (PMS) is a universal colour standard that assigns specific codes to thousands of shades.
  • Where it’s used: Branding, fashion, packaging, product design, and industries where exact colour matching is essential.
  • Why it’s important: Unlike RGB or CMYK, Pantone ensures absolute consistency. Pantone 186 C will look the same in New York, Tokyo, or Paris.

Pantone is especially important for logos and brand identity, where even a slight variation in colour can weaken recognition.

Which Colour System Should You Use?

  • Websites & Apps → Hex / RGB
  • Printed Materials → CMYK
  • Brand Identity → Pantone
  • Cross-Platform Consistency → Use Pantone first, then convert to Hex, RGB, or CMYK depending on the medium.

Final Thoughts

Understanding the differences between Hex codes, RGB, CMYK, and Pantone colours is essential for designers, marketers, and business owners. Choosing the right system ensures your colours look consistent whether they’re on a screen, in print, or on a product.

By mastering these systems, you’ll not only maintain your brand’s integrity but also communicate your message more effectively.

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