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Luminosity functions (Additivity (and why it's important) (Abney's…
Luminosity functions (
Additivity (and why it's important),
Additive methods,
It will look different for different...,
Non-additive methods to measure it,
What they tell you,
How they're measured,
Comparing additive and non-additive luminosity functions 
,
Difference due to macular pigment:
have macular pigment in front of fovea, which absorbs light at shorter wavelengths and makes us less sensitive to those stimuli,
Features of luminosity functions
x-axis is wavelength of monochromatic light
y-axis is luminous efficiency or (log) relative energy
peak at ~555 nm for photopic function, ~505 nm for scotopic function)