Re: master 68ae6fa: Improved light/dark colour predicate (bug#41544)

[Mattias Engdegård]

12 juni 2020 kl. 20.36 skrev Yuri Khan <yuri.v.khan@gmail.com>:

> Despite science calling for .18, I find that my subjective optimal
> cutoff is somewhere between .25 and .31, even if I change the formulae
> to more accurately model the piecewise gamma correction of sRGB:

Thanks for the report, and yes, I did test with the exact sRGB gamma curve and 
noticed almost no significant differences.
The only differences in the standard colour table are: #999999 (grey60), 
#ee7600 (darkorange2), #ee7621 (chocolate2) and #bc8f8f (rosybrown), all 
categorised as 'light' with power 2.2 and 'dark' with the exact sRGB gamma 
function, assuming a cutoff of 0.325. It's really hard to say which one is 
right.