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To verify the PA27JCV’s factory calibration, I measured the modes that will be most commonly used, Display P3, sRGB, Adobe RGB, DCI Cinema, Rec.709 and BT.2020. At the end of this page, there’s a summary of all the test results for each mode.
Grayscale and Gamma Tracking
Our grayscale and gamma tests use Calman calibration software from Portrait Displays. We describe our grayscale and gamma tests in detail here.
You’ll see in every chart above that the PA27JCV nails every metric. Native corresponds to DCI-P3, AKA Display P3, with a D65 color temp and 2.2 gamma. sRGB is the only mode with fixed output. It limits brightness to 80 nits and has no options for gamma or color temp. Adobe RGB also hits D65 and defaults to 2.2 gamma. It also has no color temp or gamma options. The mode termed DCI-P3 is DCI Cinema with a D63 color temp that favors green plus 2.6 gamma. Rec.709 defaults to D65 and 2.4 gamma. Finally, BT.2020 sticks to D65 and a 2.4 gamma value. I noted that no mode included support for BT.1886 gamma. In any mode but Adobe RGB and sRGB, you can change the color temp and gamma, and adjust RGB gain and bias sliders if you like.
Color Gamut Accuracy
Our color gamut and volume testing use Portrait Displays’ Calman software. For details on our color gamut testing and volume calculations, click here.
The PA27JCV aces all the gamut tests with average error values all under 2dE. The generally accepted visual threshold is 3dE so Asus meets its claimed performance right out of the box with no adjustments required. There is no Quantum Dot tech here, so color volume stops at DCI-P3. BT.2020 volume is just over 74%. I also noted that it couldn’t quite fill the green primary in Adobe RGB mode. There, it strays off the hue targets to approach 100% saturation. Volume there is just under 90%. All other modes are visually perfect.
Grayscale, Gamma and Color Gamut Test Summary
Here are the grayscale, gamma and gamut results in a summary table. Error values are referenced to the Delta E 2000 spec. Gamma range refers to the difference between the highest and lowest value. Gamma Average is the percentage deviation from the standard for each color mode.
| Row 0 - Cell 0 | Grayscale Error | Gamma Range | Gamma Average | Gamma Actual | Gamut Error | Gamut Volume |
| Native (Display P3) | 1.44dE | 0.05 | 1.82% | 2.16 | 1.10dE | 99.48% |
| sRGB | 1.13dE | 0.03 | 0.90% | 2.18 | 1.08dE | 99.63% |
| Adobe RGB | 1.00dE | 0.03 | 0.90% | 2.18 | 1.27dE | 89.38% |
| DCI-P3 Cinema | 1.13dE | 0.11 | 1.92% | 2.55 | 0.89dE | 98.61% |
| Rec.709 | 1.16dE | 0.05 | 1.25% | 2.37 | 1.94dE | 99.68% |
| BT.2020 | 1.13dE | 0.06 | 1.25% | 2.37 | 1.94dE | 74.09% |
Test Takeaway: The PA27JCV’s color accuracy is exemplary. Every mode delivers visual perfection and adherence to industry standards. It comes up short in the Adobe RGB and BT.2020 modes but that is a hardware limitation, not a design choice. For anything up to DCI-P3, it is a reference display. And the ability to alter gamma and color temp in most of the modes is a nice bit of added flexibility.
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