Thanks Godfrey, Paul & Mark... :) -c
On Sat, Feb 5, 2011 at 6:25 PM, Godfrey DiGiorgi <gdigio...@gmail.com> wrote: > On Sat, Feb 5, 2011 at 2:12 PM, Christine Nielsen <ch...@inielsen.net> wrote: >> ...If I may butt in with a related question... what about room >> lighting? I'm trying to get my own system color-managed, but I've >> seen conflicting answers... for calibrating the monitor, should my >> room be illuminated "to a reasonable reading level", or "as dark as >> possible as long as you can still operate the controls on your >> monitor" (http://www.robertstech.com/blog/?p=64!) ..? >> >> Then, once we're all calibrated & editing is underway, how should the >> room be lit? The same way as for calibrating? I'm guessing that the >> main goal would be consistency in the ambient light... and that it be >> consistently daylight-balanced? What about daytime vs nighttime >> editing...? > > The crux of the matter is your eyes. All the calibration in the world > does no good at all if your eyes are working in the wrong environment. > Quoting from my own article "Color Management Can Be Simple" – > > ::: > There are three calibration target parameters of importance: > > - brightness or luminance :: the brightness of the display > > - gamma :: the contrast curve you want to display to follow, normally > 2.2 or 1.8. > > - white point :: what color temperature is considered "white". > Sunlight is more blue than indoor room light, so white in sunlight has > a higher color temperature than white in an indoor space illuminated > by warm- white tungsten or flourescent bulbs. > > Display brightness has to be matched to reasonable ambient light in > your workspace for best results ... this is very important as it > affects how your eyes see color and brightness. *Reasonable ambient* > light means normal reading/working illumination without direct > sunlight or other high intensity light sources falling on the monitor, > not a black cave. > > E.g.: My work room light is provided by a pair of 60W equivalent bulbs > in a soft overhead light, supplemented by light filtering in around > mostly closed blinds during daylight hours. A meter reading off the > wall beside my desk shows ISO 100 @ f/4 @ 1/5 second, just to give you > an idea how bright it is. I shade the windows tightly during the day > to minimize the amount of sunlight coming in so the room light is > stable day and night. > > For this environment with an Apple Cinema Display 23" display, my > targets for calibration are 120 cdM^2 luminance, 1.8 gamma, and white > point of 5500K. The current "industry standard" settings would be > cooler white and higher contrast: 120 luminance, 2.2 gamma and 6500K > white point are also reasonable. (I prefer the warmer white and softer > gamma as it matches my printing and exhibition needs more closely.) > ::: > > I've had thousands of hits on that article and some well-known experts > in the field have vetted that it is exactly right, what they recommend > and set up in their own labs. > -- > Godfrey > godfreydigiorgi.posterous.com > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. > -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
