Comment by johnisgood
Comment by johnisgood 2 months ago
So 0.5 is correct after all?! I thought I was completely off with 0.5 and I thought it does not align with human perception because I thought I was wrong. Ouch. In my defense, it has been a while. :D
BTW, would this relatively simple way to determine if the color is dark work?
$luminance = 0.299 * $r + 0.587 * $g + 0.114 * $b;
return $luminance < $threshold;
I once did it with 0.3R + 0.6G + 0.1B < 128, mostly because I could not be bothered to think deeper than that. It was certainly not perfect — there were obvious cases where the opposite choice of black or white for contrast would have been better — but it worked well enough for my purpose (making a label at least not unreadable regardless of background colour).