Frequently Asked Questions; Calibration - NEC SpectraView II Guia Del Usuario

49 | NEC SPECTRAVIEW II - USER'S GUIDE
Chapter
6

Calibration

Question 1: How often do I need to calibrate my monitor?
Answer: The answer will depend on how critical a color accuracy is necessary, how long the monitor is used per
day, environmental conditions and the characteristics of each individual monitor. Some users working in highly critical
color applications may calibrate their displays every couple of days. Others may only need to do it once a month. The
recommended and default re-calibration period is every 2 weeks. The Validate Calibration feature can always be used
to verify the display's white point and Intensity and determine if the monitor needs to be re-calibrated. Always remember
to allow the monitor sufficient time to warm up and reach optimum color performance before performing any color critical
work or calibrating the display.
Question: (macOS only) Why can't I use the ColorSync control panel to switch between different display calibrations
like I can do with other monitors?
Answer: When used with the SpectraView software, NEC display monitors store all of the necessary color adjustments
internally, including the 10 or 12 bit Look Up Tables. The ColorSync utility switches the display color settings by changing
the Look Up Tables in the video graphics adapter. The ColorSync profiles generated by SpectraView contain linear Look
Up Tables for the video graphics adapter. Therefore the SpectraView software must be used to update the display
monitor.
Question 2: (macOS only) I'm using a wide color gamut display together with the standard gamut screen on my
MacBook. Colors in Safari look oversaturated when the window is on the wide gamut display. What is wrong?
Answer: The color management in Safari and some other Mac applications will only apply color correction for the
primary display (the display with the menu bar). When a window is moved to the secondary display, the correct color
correction for that display is not applied. This causes the images to be oversaturated on the secondary display. To
display colors correctly on the wide color gamut display it must be made the primary display. Use the macOS System
Preferences - Displays to configure the display as the primary.
Question 3: I'm using two different displays and calibrating both to the same target, however the white points do not
match exactly. What can I do to improve this?
Answer: This issue can be caused by the different spectral outputs of the two displays causing the human eye to see
color differences differently than the color sensor used to calibrate the displays. In this case the numerical measurements
from the color sensor are identical on both displays, but they do not visually match. Manually visually matching one
display to another can usually avoid this issue. The basic steps to take are as follows:
1. Calibrate both displays.
2. Pick one of the displays to be a reference. Call this display #1.
3. Select display #2 in SpectraView, open the Edit Calibration Target dialog then open the Custom White Point
dialog by clicking on the Edit... button. Use the Visual Match tool to adjust the white color so it visually matches
white shown on display #1.
4. When a visual match is achieved, put the sensor over the measurement area and click Measure. This will enter

Frequently Asked Questions