Accessible viz in : Shared baseline
Accessible viz decides what is being compared in under “Shared baseline.” The figure that must stay on the axis is 1917. Drawing it larger does not create a unit. Look first for a cut axis and a missing key. The eye compares length and position more accurately than area.
If it only works in hue, it does not work — patterns, contrast and text that survive greyscale. Accessible viz encodes values as redundant channels: position, pattern, label, not hue alone. Ishihara plates 1917; WCAG 2 contrast; Okabe–Ito palettes for deuteranopia. In reports, ads and assignments it fits public dashboards, exams, print in grey, legal slides. Skip it when relying on red/green alone to mean bad/good.
This page gathers anatomy, fit, craft, failure modes and work / ads / school recipes for Accessible viz. When the story is: public dashboards, exams, print in grey, legal slides. Skip it in cases like: relying on red/green alone to mean bad/good. 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.
Read Accessible viz as , “Shared baseline,” and 1917. A bar with no unit is not those three.1917
Figures to keep
- Year of the chart
- 1917
- Axis figure
- 1917
- Chart
- Accessible viz
- How to read it
- Shared baseline