bengbeng wrote:
I'd love to here more about the best way to calibrate monitors (primarily for web viewing) . I've several monitors and laptop screens, 2 calibration devices and there are still marked differences between the same image viewed on the 'calibrated' monitors and laptops. So , either I'm not running the procedure correctly or some screens (the laptop in particular) can not achieve accurate color rendition.
Don't bother calibrating a laptop unless it is very high end, like a recent MacBook Pro with Retina Display. Most cheap PC laptops have very cheap, 6-bit displays. They will never calibrate properly.
Desktop monitors from NEC, LaCie, Dell, and others that cost over $400 or so can be calibrated to match fairly closely. Apple iMacs can be calibrated to match very closely.
If you're buying a monitor, look for one that reproduces 100% of the sRGB color space, and over 80% (preferably 99%!) of Adobe RGB color space.
Get a calibrator kit (or upgrade your software) that allows setting parameters to match across multiple monitors.
Black Point 0.5 candelas per square meter
White Point 120 candelas per square meter
Gamma 2.2
Monitor Color Temperature 6500K
Also, the work area around your monitor should be neutral gray, close to gray card gray (Munsell N8 paint is perfect, but very expensive).
The work area should have dim, indirect lighting of 5000 to 5500K. Place the monitor where it will have absolutely no direct light falling on it.
Print viewing should be at about the same brightness as your screen, using a full spectrum 5000K CRI 91+ CFL or other fluorescent tube.
The same calibrator and software should be used on each device, and the same person should do the calibration the same way...
Realize that printers must be calibrated properly to match input color space standards. The exact combination of printer, paper, and chemistry (silver halide printing) or printer, ink, and paper (inkjet) needs at least a manufacturer-supplied generic profile, and preferably a custom profile.
Here's the flow of information for raw image processing:
Camera Raw profile --> Computer Working Space Profile (sRGB, or Adobe RGB, or ProPhoto RGB) --> Monitor Profile AND --> File Output Profile OR Printer Profile
Here's a similar flow of information for camera-generated JPEG processing:
JPEG file in sRGB --> Computer Working Space Profile (sRGB, or Adobe RGB, or ProPhoto RGB) --> Monitor Profile AND --> File Output Profile OR Printer Profile
--> means "is converted to"
**All Internet images should be in sRGB color space. MOST photo labs want sRGB JPEGs or TIFFs. Some labs and commercial printers will request Adobe RGB color space.**
Bear in mind that RGB to CMY (silver halide) or RGB to CMYK or CCMMYK (or some other inkjet scheme) is a very radical change! Prints and monitors will never match exactly. But you can get to a really fine simulation if you try. Even a $100 desktop inkjet can produce a very nice print, if you set everything correctly and calibrate/profile properly.