Accessible viz in 1917: History 뿯½ History

Ishihara plates 1917; WCAG 2 contrast; Okabe–Ito palettes for deuteranopia redundant channels: position, pattern, label, not hue alone Yes if one claim is visible at a glance in Meta, Google and retail print; otherwise link to a full figure. Yes for lab reports and poster boards if axes, units and a source line are present.

Excel or Google Sheets or PowerPoint; export SVG/PDF. Do not rely on hue alone. Label directly and check greyscale. Accessible viz: honour redundant channels: position, pattern, label, not hue alone, and switch when relying on red/green alone to mean bad/good. The core mark of Accessible viz is redundant channels: position, pattern, label, not hue alone.

public dashboards, exams, print in grey, legal slides The eye compares length and position more accurately than area. PowerPoint, Excel or Google Sheets and Meta, Google and retail print share the same geometry. Decoration rarely persuades; it slows reading. Perspective distortion wrecks comparison. Keep it flat.