Color gamut is measured using a saturation sweep that samples the six main colors (red, green, blue, cyan, magenta, and yellow) at five saturation levels (20, 40, 60, 80, and 100%). It yields a more realistic view of color accuracy.
The out-of-box chroma results are interesting because they show how incorrect gamma can affect color saturation. If you look at the 100-percent points (the edge of the triangle), they’re pretty close to their targets. But the lower saturations are as much as 20 percent off the mark. For instance, 40-percent red is right on the 60-percent target. The net result is that the image looks oversaturated in most cases, even though gamut volume is essentially correct. There is a little compensation in the form of lower luminance values for red, magenta, and blue. Of course, what we want to see is for all saturation values to hit their respective targets.
Engaging the CAD/CAM preset worsens the saturation issues. Eighty- and 100-percent values are almost the same, meaning detail in the brightest parts of the image is nearly non-existent. Because of the cooler grayscale in this mode, the cyan and magenta secondaries are off in hue as well.
An instrumented calibration is the best way to set things right. The 20 to 80 percent levels in red, magenta, and blue are still a tad over-saturated, but the lowered luminance brings the actual error below three Delta E. The BL3200PT isn’t quite at the accuracy level of a factory-calibrated professional monitor, but it doesn’t cost nearly as much, either. Considering price versus screen size, this remains an excellent performer.
Now we return to the comparison group:
A 2.02 Delta E result may represent a last-place finish, but it’s still an invisible error. All of the monitors in our group offer great color accuracy, and you’d be hard-pressed to tell the difference in a side-by-side comparison.
Gamut Volume: Adobe RGB 1998 And sRGB
There are basically two categories of displays in use today: those that conform to the sRGB/Rec. 709 standard like HDTVs, and wide-gamut panels that show as much as 100 percent of the Adobe RGB 1998 spec. We use Gamutvision to calculate the gamut volume, based on an ICC profile created from our actual measurements.
Before calibration, the BL3200PT’s sRGB gamut volume measured closer to 103 percent. While this isn’t a big deal in productivity or entertainment applications, photo and graphics users will want to calibrate for greater accuracy and a 100-percent volume. The main culprit is the blue primary, which is over-saturated at the Gamma 3 setting.
- A 32-Inch QHD AMVA Monitor
- Packaging, Physical Layout and Accessories
- OSD Setup and Calibration
- Measurement and Calibration Methodology: How We Test
- Results: Brightness and Contrast
- Results: Grayscale Tracking and Gamma Response
- Results: Color Gamut nd Performance
- Results: Viewing Angles and Uniformity
- Results: Pixel Response and Input Lag
- BenQ BL3200PT: Bigger Is Better