On Wed, Apr 19, 2006 at 05:14:07PM -0400, DJ Delorie wrote: > > > 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).
I asked what the gray is supposed to be. You say that it depends on the gamma setting of my X software. Supposing is an action of human mind. Does it mean that the person who decided the postscript generation can not only remotely read the setting of my X server, but can also do it against the flow of time? > > 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 What do you mean with "display 50% grey"? 50% of what? 50% of voltage range on the monitor input, 50% of the numerical range in the video card, 50% or numerical range in the X application's output range, or 50% of maximum photon flux? > with the gamma settings until they look the same. That's what I am not going to fiddle with gamma setting of my X server. Setting it to anything else than turned off causes additional colour rounding in the display chain and resulting colour resolution degradation. Instead of this, I am calibrating my display application which is the Links browser in this case. The browser is performing 48 bit/pixel dithering for 24 bit/pixel with proper gamma management which I personally wrote, so the result is perfect without colour fringing even in the smoothest transitions, and with proper colour hues. http://links.twibright.com/calibration.html > 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, This does have to do with PCB that I am asking what grey the grey was meant to be. If you want to make the grey with little black spots on white paper, how many % of area are the black spots going to take? > it's not important what the actual grey level is. That's not true - if this grey level gets too close to white or black, then the assembly drawing gets unintelligible. That's also why I am asking. If I didn't care if the assembly drawing gets understood or not, I would not ask. But I am displaying it on a webpage and I want the people to be able to read it. CL<
