The XG2431 has no problems with color and grayscale accuracy. It ships in its Standard picture mode and that is the best choice whether you calibrate or not. Other modes may enhance specific games, but if accuracy is the goal, Standard is the way to go.
Grayscale and Gamma Tracking
I could see a slight blue tint in the grayscale step patterns used for evaluation. The error is only visible in steps above 50% brightness. It is very hard to see an issue in actual content. The XG2431 can be enjoyed without calibration but with a few changes to the RGB sliders, it can be even better.
After adjustment, the XG2431 is nearly at the reference level. There are no visible errors and all values except 100% are under 1dE, excellent performance. The only concern here is gamma tracking which is a bit light in the brighter parts of the image. It’s better to see a straight line that stays close to the 2.2 reference point. This means some highlight detail won’t be as well defined, though I did not observe any clipping or washing out of finely shaded picture elements.
The XG2431 performs well in the out-of-box test with a second-place finish in the grayscale tracking comparison. 3.31dE is on the high side of average for this display category. 3dE is generally considered to be the point where errors become visible so the XG2431 looks pretty good without calibration. With changes to the RGB sliders, the value drops to an impressive 0.85dE. Anything under 1dE in this test is an excellent result.
Gamma tracking is less impressive, with a 0.26 range of values and a 5.45% deviation from the 2.2 standard. Improvement here would help with the XG2431’s perceived contrast. Better gamma tracking with a darker option would make a visible difference.
Color Gamut Accuracy
Color gamut accuracy is one place where I have no complaints. The XG2431 is superb out of the box with a low 2.21dE average error. Calibration takes that to an even better 1.57dE. Both scores are better than average for the category. The monitor follows the sRGB standard closely with just a slight bit of red over-saturation and minor hue errors in the secondary colors. Calibration fixes the hue errors for a near reference level result.
The XG2431 wins the color accuracy comparison with calibration and would place third if left unadjusted. This is excellent performance. Though I have complained about low contrast, it is one of the most color-accurate gaming monitors I’ve tested in this price category.
All the monitors in the group are sRGB-native screens. There is no extended color here. Very few FHD panels include a wide gamut. That said, some displays add a little color right up to the PX259 Prime’s 112% coverage of sRGB. The difference can be seen in a side-by-side comparison, but it is subtle at best. The XG2431 is the most accurate of the bunch, with just over 102% coverage. One could perform color-critical tasks without a compensation profile in place.