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Design Guide

Start Here

  • Overview
  • Introduction to Color Science

Color · Foundations

  • Color Spaces & Models
  • Color Gamuts
  • Perceptual Uniformity

Color · Accessibility

  • Contrast & Accessibility
  • Color Blindness

Color · In Practice

  • Color Mixing & Gradients
  • White Point & Adaptation
  • Practical Guides

The Guide

Design decisions, with science

Book + Lab for product design: color perception. Read the why, experiment in a lab, lock a decision — then use AI later to go faster, not to skip the craft.

Start Here

  • OverviewHow Designer In You maps Book + Lab across color, type, and layout.
  • Introduction to Color ScienceLight, eyes, and why color is a perception — not a property of objects.

Color · Foundations

  • Color Spaces & ModelsRGB, HSL, CIELAB, and OKLCH — what each is for and where each breaks.
  • Color GamutssRGB, Display P3, and Rec.2020 — what your screen can actually show.
  • Perceptual UniformityWhy equal numbers should mean equal-looking steps, and how OKLCH delivers it.

Color · Accessibility

  • Contrast & AccessibilityWCAG 2.x contrast ratios, APCA, and how to pick readable color pairs.
  • Color BlindnessHow color-vision deficiency works and how to design palettes that survive it.

Color · In Practice

  • Color Mixing & GradientsAdditive vs. subtractive mixing, and why gradients look muddy in sRGB.
  • White Point & AdaptationIlluminants, D65, and why white isn't one fixed color.
  • Practical GuidesRecipes: building palettes, checking contrast, and shipping OKLCH in CSS.

This guide is a living document - chapters end with primary sources (W3C specs, MDN, and original research) so you can go deeper than any summary.