bug#41544: 26.3; Possible incorrect results from color-distance

[Mattias Engdegård]

7 juni 2020 kl. 11.04 skrev Simen Heggestøyl <simenheg@runbox.com>:

> I can't comment on the patch overall, but this part at least seems to
> address Richard Copley's complaints in bug#30295. A dark foreground is
> now used for #0f0/rgba(0,255,0,0.5) and #5e5 as Richard requested, which
> indeed looks more readable to me too.

Thank you, and yes, this was actually one of the motivations.

> Maybe the pendulum has swung too far however. For instance, a dark
> foreground is now used for #ef716e, which I think was easier to read
> with the light foreground used before. Could that be fixed by tweaking
> the cut-off values in color-dark-p, perhaps?

Right; the current predicate should be a significant overall improvement but 
there are inevitably some colours where the decision isn't quite right. I'll 
see what can be done about it. It seems to be mainly those somewhat reddish 
colours that need some work.
Perhaps you could try list-colours-display and see if you can spot a pattern?

I'll be back with a longer reply on the principles later.