8.Adjust the position of the counterweight so that the colorimeter is properly positioned and maintains its position when released. To adjust the position of the counterweight on the USB cable, squeeze the release button and slide the weight.
Figure 4-12 Adjusting the counterweight
Alternatively, you can mount the colorimeter on a tripod and position it in front of the displayed target. If you use a tripod, position the colorimeter as close as possible to the screen and ensure that it is positioned perpendicular to the surface of the display.
9.Click on Enter to begin the calibration process. The display will now begin calibrating itself. If the colorimeter is not connected to the USB port of the display, a “Device Connection Error” will appear. Connect the device and Retry.
If the colorimeter is not correctly aligned, a “Diffuser Position Error” will appear. Position the colorimeter perpendicular to the screen, with the lens (which was covered by the ambient light filter) against the screen, in the target being displayed. Then Retry.
Otherwise, you will see a message that the display is calibrating.
10.If you are calibrating a video wall, repeat these steps for each display.
To achieve the color temperature and luminance you specify, the display and colorimeter interact to display and measure a series of colors. Needed corrections are written into a look-up table which the display uses in daily operation.
To gauge the success of this process, the devices set brightness and contrast to 50, adjust the backlight to produce the target luminance, and measure the following parameters:
●Luminance
●Color Temperature
●Gamma
●R, G, and B Primaries in CIE X,Y color space.
If any of their targets for these can not be achieved, a “Color Calibration Fail” message will appear listing those parameters from the list that could not be adjusted properly.
When the process is finished, you can view the results with the Result option in the Color Calibration submenu. In addition to the parameters listed, you will also see the number of hours since calibration.
Following calibration, changes to settings that affect brightness or color may prompt a warning that lets you know the displays may no longer be showing the target luminance and color temperature. To preserve uniformity, make any such changes to all displays in the video wall. Also, leave the ambient light sensor off.
Once a wall has been calibrated, the calibration should be valid for 9000 hours, which is equivalent to one year of continuous use (no off time). If an individual display is replaced during that time, it may only be necessary to calibrate the replacement display(s).
ENWW | Tuning color 51 |