Emphasis Parameter
The Emphasis
parameter exclusively applies to the Emphasis lookup table definition method.
It allows transforming an image using a power-law expression:
Output = Inputγ
The γ – Gamma – exponent is mathematically linked to Emphasis by:
γ = 10-Emphasis
Emphasis | Gamma | Note |
---|---|---|
1.00 | 0.1 |
Max. Emphasis value; smallest γ value |
0.00 | 1 | Default Emphasis value; linear law |
-1.00 | 10 | Min. Emphasis value; largest γ value |
To achieve a required given γ, Emphasis
should be set to:
Emphasis = - log10γ
The following charts explain the emphasis effect for typical values of Emphasis
and both values of Negative
.