REVIEW: HP LP2475w Part 12
No banding can be seen on test pictures, neither in the factory settings nor after the calibrations. Grey wedges are also reproduced very evenly and colour neutrally when the monitor is calibrated. The correction curves for the calibrations are almost perfectly linear along the bisecting line of the angle and show that no extreme adjustments need to be made to the LUTs of the graphics card.
The correction curve after calibration to sRGB with sRGB gamma (about 2,2) is shown on the left and the correction curve after calibration to the UGRA criteria with a gamma of 1,8 can be seen on the right.
The closer the three coloured lines lie to the 45° axis, the fewer colours must be discarded for the correct calibration of the graphics card and the more intact the colour gradients remain.
Calibration to the UGRA specifications can be seen as the only exception, since here, a gamma value of 1,8 should be achieved, which unfortunately oversteps the adjustment options of the monitor. Thus, it is only by intervening in the LUTs of the graphics card that a gamma value of 1,8 can be conjured from the monitor’s gamma value of 2,28, which naturally leads to loss of colour.
For UGRA, it is necessary to calibrate to 5800K, 120 cd/m² and gamma 1.8, which was achieved with a brightness of 11, contrast of 80, red 255, green 231 and blue 237 in the OSD.
As could be seen above in the UGRA correction curve, the grey balance is the weak point of the monitor for this test because of the colour values discarded. You can read in detail in the UGRA test report that just 91 percent of the grey values could be displayed.
The summary of the UGRA report confirms that the grey balance is too poor, as we had expected before. The detailed UGRA report can be downloaded as a PDF file.
To sum up, we can remark that the colour space of the HP LP2475w is huge and that its coverage and reproduction quality for the AdobeRGB colour space. When it is calibrated to sRGB, the relevant colours are not reproduced very precisely, but there are also monitors which demonstrate poorer calibration results despite having a smaller colour space. However, there are also monitors which are more suitable for the sRGB colour space.
The UGRA certification, which has been carried out in this case in accordance with the more demanding standard of the future, shows only that an adjustable gamma curve would have rounded off the monitor for professional graphics workers.
Not only because of the S-IPS panel with its resistant viewing angles is the LP2475w highly recommended for graphics workers, but also because accurate display of smaller colour spaces can be brought about, e.g. through using colour profiles and the definition of the working colour space in Photoshop or PaintShopPro. Even though the contrast values are not as good as those provided by modern S-PVA panels, the HP LP2475w still convinces completely when it comes to image quality.
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