Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Jacob" <flashinet@...> wrote:
>
>[...] Then I calculated:
> roughness = (white area size * white area RGB)/(gray area size * gray area RGB)

Just out of interest a highly academic question: what does "gray" exactly means? I assume "non-white". If so, one very light dot against a white background contributes as much to "roughness" as a black one, which goes against my intuition. But as said, I guess it is of academic relevance only...

Joost