Scientific poster design

Accessible Scientific Poster Colors and Contrast

Build an accessible poster palette that preserves data meaning through contrast, labels, patterns, grayscale, and colour-vision differences.

By Hendri Susetyo (ArsyaVisual) · Published · Updated

Give every colour a job

Begin with dark text, a quiet background, and one accent for navigation or emphasis. Add categorical or sequential colours only when data require them. A restrained palette makes exceptions meaningful and reduces competition between logos, headings, charts, and decoration.

  • Define background, text, and accent roles.
  • Reserve saturation for priority.
  • Avoid colour behind long paragraphs.

Never encode evidence with hue alone

Readers may not distinguish red from green or colours with similar lightness. Pair hue with direct labels, line styles, markers, or patterns. Sequential scales should change in one perceptual direction, and categories must survive colour-blind simulation and grayscale.

  • Label important marks directly.
  • Combine solid and dashed lines.
  • Check every plot in grayscale.

Measure contrast after export

Print can darken backgrounds and reduce subtle differences. Check text and essential graphics with a contrast tool, inspect the PDF, and request a proof when fidelity matters. Accessibility review belongs after export as well as during design.

  • Test small text on its actual background.
  • Check axes and error bars.
  • Do not approve from one monitor.

A practical example

A treatment chart can use blue circles and orange triangles, solid and dashed confidence lines, plus direct labels. Shape, line style, and text preserve the comparison if colours converge.

Apply an accessible palette to complex figures

Choose custom design when several plots, institutional colours, and print constraints must become one coherent system without making colour the only carrier of evidence.

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Sources and further reading