Accessible Color Palette Builder for Charts
Colors that work for everyone.
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Build a chart color system that is accessible. Brand colors: [BRAND_COLORS]. Number of categories to show: [NUMBER_OF_CATEGORIES]. Background (light, dark, or both): [BACKGROUND]. Where charts appear: [MEDIA]. Deliver: 1. A categorical palette sized to the number of categories (explain why more than about six colors stops working) with hex codes, in order of use. 2. A sequential palette (light to dark, 5 steps) for ordered data and a diverging palette for data with a meaningful midpoint. 3. A contrast table: each color against the background with the ratio and whether it passes 3:1 for graphics (state the standard to be confirmed [VERIFY]). 4. Rules for not relying on color alone: direct labels, shapes, line styles, patterns. 5. A simulation plan: how to check deuteranopia, protanopia, and tritanopia views and what to change if two colors merge. 6. Dark-mode variants. 7. A code snippet that registers the palette in [PLOTTING_LIBRARY]. 8. A one-page usage guide: which palette for which chart, and what to do for highlight versus context (one strong color, the rest gray).
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