CalMAN RGB How-To: Advanced Calibration, Part 2
Now we’re into the meat of the calibration. The meter window is always at the center of the screen, as you see below. This lets you set your instrument in place for the duration. If you use an i1Pro, you’ll have to re-initialize it every 10 minutes, while the i1Pro2 and C6 meters don’t have that requirement. We used the C6 for the rest of our testing.
This is our Dell UP3214Q in its Standard picture mode. It’s pretty close to the mark, but there is room for improvement, especially in the color gamut. On the left is a grayscale trace showing a slight blue tint to the image. An average error of 3.85 Delta E is tolerable, but we want to get under one as we always do! The color checker is something we don’t typically use in reviews. However, it’s a practical measurement of color. Rather than primary and secondary color saturations, the color checker measures recognizable shades like grass, sky, and flesh. When you’re able to create a LUT, it’s possible to adjust for these colors. Of course, with a traditional CMS, you need to measure primary and secondary colors to hone the results.
Next up is the Contrast adjustment.
This is pretty cool way to adjust Contrast. When we do it for a monitor review, we use patterns that show clipping points for white and the three primary colors. We also measure a 100-percent brightness pattern to fine-tune the setting. CalMAN's screen does pretty much the same thing. It measures patterns from 90 to 100 percent so you can see if any color clips. You’ll need several runs to get it right, but the process doesn’t take long. Since Dell's UP3214Q connects with CalMAN’s DDC control, the slider on the lower-right will change the Contrast setting in the OSD.
The following image is what you want to see.
When all three primaries form a straight line, you have your Contrast set correctly. Unlike Brightness, Contrast has only one ideal setting. Brightness controls the backlight so you should always use that to control light output.
Setting Brightness is even easier.
All you have to do is type your desired maximum output number into the dialog box. Then click the AutoCal button at the bottom-right. CalMAN flashes patterns and adjusts your Brightness control until the target is reached. If your monitor doesn’t support DDC, use the OSD to set it manually.
On the next page, we move on to grayscale calibration.