Digital marketing glossary

Colour contrast ratio: meaning

Written and reviewed by L.K. Monu Borkala · Updated 5 November 2026

Definition

Colour contrast ratio: A measure of how different text and background colours are in brightness. A common accessibility guideline recommends at least 4.5:1 for normal text.

Definition from the OneCity AI Academy course notes.

Where you learn it

Module 13: Graphic Design & Video
- Class: Design Principles for Marketers

Alignment
Contrast
Font pairing
Proximity
Repetition
Visual hierarchy

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Definition

Where you learn it

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