blowin' in the wind
Green ribbon tied to a white electric fan: composite of 17 images
Well, since you asked: this is a "p-norm" average, defined by the equation
avg = [ (1/n) sum_i=1..n (x_i ** p) ] ** (1/p),
Here, p=1 would be a regular (so-called "arithmetic") average, what you might get with an in-camera multiple-exposure. Using p=-1 would be a "harmonic mean," which puts a little more emphasis on darker shades (the ribbon being darker than the fan), and I used p=-5 for a more extreme version of that. Choosing the value of p is kind of like pushing a "slider," though in this case not to the MAX but more to the MIN. Wait, you didn't ask?
blowin' in the wind
Green ribbon tied to a white electric fan: composite of 17 images
Well, since you asked: this is a "p-norm" average, defined by the equation
avg = [ (1/n) sum_i=1..n (x_i ** p) ] ** (1/p),
Here, p=1 would be a regular (so-called "arithmetic") average, what you might get with an in-camera multiple-exposure. Using p=-1 would be a "harmonic mean," which puts a little more emphasis on darker shades (the ribbon being darker than the fan), and I used p=-5 for a more extreme version of that. Choosing the value of p is kind of like pushing a "slider," though in this case not to the MAX but more to the MIN. Wait, you didn't ask?