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local function lux_to_gamma(lmin, lmax, rmin, rmax, lux)
if lmax <= lmin or lux == 0 then
return 1
end
local num = (rmax - rmin) * (math.log(lux, 10) - math.log(lmin, 10))
local den = math.log(lmax, 10) - math.log(lmin, 10)
local result = num / den + rmin
-- clamp the result
local max = math.max(rmax, rmin)
local min = math.min(rmax, rmin)
return math.max(math.min(result, max), min)
end
local function lux_changed(_, lux)
local gamma = lux_to_gamma(16.0, 256.0, 1.0, 1.2, lux or 0)
mp.set_property_number("gamma-factor", gamma)
end
mp.observe_property("ambient-light", "number", lux_changed)
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