Originally Posted by
Manfred M
Kim - which screen are you using and tool are you using to calibrate?
There are two key things to pay attention to when setting up your work area; the first is getting the calibration right and that means having the screen set to between 80 and 120 candela / square meter (a.k.a. "nits", if you see that term used). Most screens are set up far too bright and "out of the box" they are often in the 200 - 600 candela / square meter range. This is fine for watching movies or working in an office environment, but not for photo editing. My calibration software lets me set the brightness level when I run it. I have set my screen to 100 candela / square meter; I know a number of site members that are running their screens at 120 candela / square meter.
The second issue is room brightness. If you are working in a room that is too bright, the ambient light reduces contrast. To understand that effect, look at your cell phone screen in a dimly lit room, a normally lit room and outside in bright sunlight. Look at how contrasty the room is in the dimly lit room and how low it is in bright sunlight. The same principle applies to the screen you are using to edit your images.
Normally the recommended room brightness is having a light level below 70 lux. I happen to work in an area where the light level is 40 lux. My handheld light meter (Sekonic L-358) comes with a conversion table so I can easily measure the light level in my workspace. As I work in a basement office, I have virtually the same level of lighting throughout the day.