REVIEW: Acer G24 Part 9

deltaE deviation

Explanation of deltaE deviation: Deviation of colour values is measured deltaE 94 (dE). Numerous grey gradients, the primary (RGB) and secondary (CMY) basic colours are measured. A deltaE value of 1 represents the smallest difference in colour that the human eye can perceive.

Most people only notice a difference in colour from a value of 3. However, our eyes are more sensitive to green tones, so smaller differences may be noticed here. The average deviation should be less than 3 dE and the maximum should be under 10 dE or, better still, under 6 dE. Up to 10 dE, two colours are still sufficiently similar.

Comparison of factory settings with sRGB Standard

Factory setting	sRGB standard	Measured
White point / Kelvin	6500	5550
Brightness / cd/m²	140	370
Black point / cd/m²	0,00	0,53
Contrast / x:1	Native	697
Gamma / average	sRGB (~2,2)	2,38

In the factory settings, the Acer G24 deviates strongly from the primary colours, especially in the primary colours, but this is normal in light of the extended colour space. With a colour temperature of 5550 Kelvin, the 24-inch model is somewhat warm in its set-up. The brightness 370 cd/m² is also too high for long-term usage and causes the black value to suffer. The contrast of 700:1 ensures a colourful and well-balanced image, but is not excessive.

Comparison of Graphics mode with sRGB standard

Graphics mode	sRGB standard	Measured
White point / Kelvin	6500	5650
Brightness / cd/m²	140	416
Black point / cd/m²	0,00	0,61
Contrast / x:1	Native	681
Gamma / average	sRGB (~2,2)	2,23

Graphics and Film modes produce very similar results. Graphics mode deviates somewhat more from the sRGB norm, but produces the most brilliant image subjectively speaking, which is also due to the very high brightness. The deltaE deviations are comparable with those in the factory setting.

However, the colours in Graphics mode are a little too harsh and overdone. The brightness of 416 cd/m² already almost hurts the eyes. The black value is relatively poor at 0,61 cd/m², which is why this mode is only enjoyable in brightly lit rooms. A different image mode and a lower brightness should be selected for a good sRGB display.

Comparison of calibration to sRGB with sRGB standard

Calibrated	Goal	Measured
White point / Kelvin	6500	6500
Brightness / cd/m²	140	135
Black point / cd/m²	0,00	0,22
Contrast / x:1	Native	613
Gamma / average	sRGB (~2,2)	2,20

Once calibrated, the Acer G24 displays the sRGB colour space very well for a wide colour display. The deltaE values of the grey levels are easily at an acceptable level. The target colour temperature of 6500 Kelvin is achieved and does not fluctuate.

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