> I would like to display the postscript on my laptop. Black means 0 > photons per some time and white means 100 photons. How many photons > is the gray supposed to have per the same time?
I don't know. It depends on, among other things, the gamma of your monitor and the gamma settings for your X software. Mine is set to 1.5, which gives me a linear response (grey50 is really half-bright). Plus, "gray" is a concept, not a specific color. "0.5 grey" is a specific color. And, if you care that much about grey levels on your monitor, just display some 50% grey next to a 50% black/white dither, and fiddle with the gamma settings until they look the same. That's what everyone else does, because every monitor is a little different. What does this have to do with PCB? The only time non-black is used, it's not important what the actual grey level is.
