> 2) There is a linear but not proportional relationship between the silver
> and stain densities (of the PMK processes negative) as exposure (time of
> devleopment) increases.
I could use more explanation here. How can something be linear but not
proportional? As far as I know a linear relationship is directly
proportional (example: y = Mx where M is the proportionality constant).
- Wayde
(wallen@boulder.nist.gov)