lou_erhardt

<p>It is definitely a blanket statement, and I stand by it as an accurate one. The NEC Spectraview system OEM's the X-rite EyeOne Display 2 as its meter. In and of itself, this is a fairly simple meter. Just like all tristimulus colorimeters, the sensor has no way of distinguishing ambient light vs. light from the screen. However, thanks to peripheral vision, our eyes can! This is called "chromatic adaptation" and it is the reason why someone's white shirt will appear white to us - just the same in daylight, incandescent light, and florescent light, etc. Essentialy, in order for the meter to properly see the screen (as our eyes do), we need to either separately measure and eliminate the ambient light ...or simply eliminate it.<br>

I looked up NEC's site for the system you reference. Apparently they also sell a hood to block ambient light from leaking in the sides of the meter, just for that purpose:<br>

http://www.necdisplay.com/supportcenter/monitors/spectraview2/purchase/</p>

<p>It is definitely a blanket statement, and I stand by it as an accurate one. The NEC Spectraview system OEM's the X-rite EyeOne Display 2 as its meter. In and of itself, this is a fairly simple meter. Just like all tristimulus colorimeters, the sensor has no way of distinguishing ambient light vs. light from the screen. However, thanks to peripheral vision, our eyes can! This is called "chromatic adaptation" and it is the reason why someone's white shirt will appear white to us - just the same in daylight, incandescent light, and florescent light, etc. Essentialy, in order for the meter to properly see the screen (as our eyes do), we need to either separately measure and eliminate the ambient light ...or simply eliminate it.<br>

I looked up NEC's site for the system you reference. Apparently they also sell a hood to block ambient light from leaking in the sides of the meter, just for that purpose:<br>

http://www.necdisplay.com/supportcenter/monitors/spectraview2/purchase/</p>

<p>There is some incorrect information here. When calibrating with a meter, you want to have all ambient light set to zero (0), pitch black room lighting. If you can't get there (due to a window nearby) drape a shroud over the screen and sensor.<br>

Contrast is rarely set to max, and black level or brightness is typically well below the factory default of 50, or middle setting. You need to adjust these properly FIRST before taking the meter out, and this setting IS properly determined by ambient lighting. Set up your room lighting in the normal viewing conditions, and use some Pluge patterns to dial in the Brightness & Contrast. <br>

A simple, free program of patterns can be found here:<br>

<a href="http://spectracal.com/download_HTPC.html">http://spectracal.com/download_HTPC.html</a><br>

After you're done with that, then complete the CMS gammut (if applicable), then the white balance / RGB greyscale adjustments, then you go back to Brightness & Contrast to make sure they weren't affected.<br>

Good Luck! :)</p>

<p>The DTP94, along with all tristimulus meters in its price range, with not have the chromaticity range for measuring CMS on a wide gammut display. A better solution for wide gammut displays are spectrophotometers like the ColorMunki or the EyeOne Pro. Also, due to the LED backlight's sharp spectral characteristics, be aware these two meters can have issues with LED-based LCDs, and you will want to have a special LED LUT added by the distributer.</p>