Difference is what makes anything perceivable, and it is measurable for text against its background.
UI foundation · Visual design
Tag
legibility
Entries tagged legibility, drawn from across the library. Tags cut through the section structure, which is where most of the useful connections are.
3 entries across 1 section
Category
Level
3 entries
How pure a colour is, and the dial that most often needs turning down in interface work.
UI foundation · Color
Interface typefaces are chosen for legibility at small sizes and complete character coverage, not for character.
UI foundation · Typography