Swift evaluation of LG's 27GX790A OLED display: Outstanding brightness, vibrant colors, and rapid response rate
The LG 27GX790A monitor has been tested by Portrait Displays using Calman software and has shown very good grayscale and gamma performance.
In sRGB mode, the grayscale of the 27GX790A is warmer by default but can be adjusted using the RGB sliders. The gamma in sRGB mode cannot be adjusted, but it is described as "slightly but not visibly affected," indicating stable and accurate gamma tracking.
The 27GX790A benefits from the OLED panel’s inherently wide color range, offering strong coverage of wide gamuts useful for HDR and gaming contexts. Factory calibration provides generally good color temperature accuracy, and the monitor does not display the oversaturation issues typical of some QD-OLED gaming monitors by default.
In comparison with other recent QD-OLED monitors like the MSI MAG 272QP X50 and Alienware AW3425DW, the LG 27GX790A holds its own. The 27GX790A's gamma tracking is very good and stable, while the MSI MAG 272QP X50 has average gamma tracking out-of-the-box. The Alienware AW3425DW, on the other hand, boasts nearly perfect gamma tracking.
The 27GX790A's grayscale accuracy is also competitive. It has a warm grayscale by default but can be adjusted, while the MSI MAG 272QP X50 has an average grayscale deltaE ITU average. The Alienware AW3425DW, however, performs exceptionally well, with nearly all grayscale errors below 2dE and capable of being calibrated below 1dE.
In terms of color gamut coverage, the 27GX790A offers wide OLED gamut, similar to QD-OLED models, though exact percentage coverage numbers specific to this model weren't provided in the available data. The MSI MAG 272QP X50 offers 99.5% DCI-P3, 98% Adobe RGB, and 82.1% Rec. 2020 coverage, while the Alienware AW3425DW boasts a wide gamut with high factory accuracy.
Overall, the LG 27GX790A's grayscale and gamma tracking are excellent in practical use, comparable or slightly better than the MSI MAG 272QP X50 but slightly less perfect than the Alienware AW3425DW’s near-professional calibration. Its color gamut coverage and accuracy are strong, typical of OLED/OLED-derived monitors, enabling vivid and accurate colors suited to gaming and content work.
Despite its warm-toned image out of the box, the 27GX790A is on par with the best screens after calibration. Calibration can correct the issues in sRGB mode if color grading is planned with the 27GX790A.
The 27GX790A, like other monitors, has 13 picture modes. Visually, there will be nearly no difference in accuracy between the 27GX790A and other top screens, but the top four screens have Quantum Dot technology that delivers up to 16% extra color to the red and green sides of the triangle.
The LG 27GX790A's exceptional grayscale and gamma performance is reminiscent of the technology found in smart-home devices, ensuring precise and stabilized visual output that is akin to advanced gadgets. With calibration, this monitor can compete with the best screens in the market, offering potential for superior color accuracy, much like the progress achieved in the realm of technology.
