> > A somewhat related question - colour fonts are used beyond
> > emoji's. While there are 5 kinds of emoji fonts now, and most
> > people are using one of 4... but if you check Google Fonts, there
> > are 10 colour fonts, one is emoji, but 6 are Arabic (useful for
> > annotating the Quran...) and 3 are Latin. So there are intentions
> > for text fonts. A few percents of western male population is
> > color-blind. Colour-blindness is one of the most common eye
> > problems, after short-sightedness :-).
>
> I’m colour-blind, but not sure I understand what you’re asking
> here. None of the colour fonts on Google Fonts seem obviously
> difficult to read for me.
Let's assume that you can't discern colors A and B, where both map to
exactly the same gray value C (or to almost identical values). If a
glyph uses those two colours exclusively, you will have problems with
both a colour and a gray-level version of it.
Werner
