## Proof
by example is unscientific

Suppose I place a blindfold over my eyes, walk across Yonge
Street, and reach the other side without having been struck by a car.
I could say, "It is safe to walk across Yonge Street wearing a blindfold."
(I could even say, "It is safe to cross any street wearing a blindfold.")
But this is faulty logic. This is not proof by example, but by counterexample.
The only conclusion you can draw from the experiment is this: "If you
walk across a street wearing a blindfold, you will not necessarily
be struck by a car." Proof by example is not scientific.

You can *disprove* by example! If you are struck by a car [sorry
about the violent analogy], then you can say, in the general case, it is
unsafe to cross the street wearing a blindfold. But you cannot prove by
example.

I claim that I can prove that 8-bit linear-light intensity
coding cannot work in the general case. I invite you to draw your conclusions
from science. Simply consider the Weber fraction, and 8-bit linear-light
intensity coding. Can it work?

Timo offers proof by example,
not proof by science.

*See also: Gamma FAQ
- Linear and nonlinear coding*

Charles Poynton

Copyright © 1998-07-27