What Rich Bog by Lodging: Perceptual Contrast: How This Color Creates Visual Hierarchy

November 23, 2025 What Rich Bog by Lodging

Understanding how What Rich Bog by Lodging (RGB (149-15-4), HSL 5°/95%/30%) creates contrast against other colors is essential for accessible, effective design.

What Rich Bog by Lodging
#950F04 · RGB (149-15-4) · HSL(5°,95%,30%)

At 30% lightness, this color's relative luminance determines its contrast ratio against white and black backgrounds.

Relative Luminance

WCAG contrast ratio is calculated from relative luminance — perceived brightness accounting for the non-linear relationship between RGB values and light emission. The formula weights green highest (0.7152), red second (0.2126), and blue lowest (0.0722), reflecting the eye's cone sensitivity distribution.

WCAG Contrast Standards

Required ratios: 4.5:1 for normal text (AA), 3:1 for large text (AA), 7:1 for normal text (AAA). UI components (buttons, inputs, icons) require 3:1 against adjacent colors. WCAG 3.0 APCA will provide more nuanced guidance for complex contexts.

  • Luminance contrast is the most important axis for readability
  • Hue difference alone is unreliable — color-blind users may not perceive it
  • Test every text/background pair — do not estimate visually

Colors with similar perceptual properties:

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