In my case, I have a background color
#333 and a "+" layer with blend mode
difference. The blend mode is evidently so that the "+" is always nicely visible for any background color variation. But the default value for the background is
Now I don't know what color I have to input for the "+" so that it looks against the default
#333 as if the "+" had a color of
#eee for blend mode
difference is darker than
normal; darker than what I want.
Is there some sort of formula or online calculator for these sort of things? Or maybe the graphic editing app I need it for (Inkscape 0.92.3) has it somewhere?