After calibration, the image significantly improved, especially in terms of white balance, which is now more stable, and the hues have gained a natural quality, eliminating the previous impression of an overly cool image. The calibration brought noticeable benefits in tonal quality – shadows and midtones are now more realistic, and the overall appearance seems more harmonious. Unfortunately, hardware limitations still affect image quality. Brightness characteristics remain problematic, despite our efforts, and due to poor coverage of the DCI-P3 and BT.2020 colour gamut, delta E errors are still at a high level. Although calibration improved some aspects, the television still does not provide full satisfaction.
Although the factory settings of the Filmmaker mode on Hisense U6NQ were quite good, we decided to undertake calibration to fully assess the capabilities of this model. Only after such a procedure can one see how the television performs under ideal conditions. In the case of SDR content, which was already at a high level, we managed to further improve the white balance. However, the biggest change came from adjusting the brightness characteristics – gamma was optimised and no longer causes excessive darkening of the image, which improves its naturalness.
For 4K HDR content, calibration also yielded positive results. We eliminated the issue of blue dominance, which resulted in a more balanced and natural image. However, managing brightness in HDR materials remains a more complicated issue. The EOTF curve, although it had problems with image darkening in the 10–30% brightness range under laboratory conditions, reveals other shortcomings in real scenes. The television tends to overly brighten the smallest elements on the screen. As a result, this leads to noticeable halo effects around bright objects. This phenomenon, which we mentioned earlier in the context of contrast and HDR, arises from the technological limitations of the model and is often difficult to eliminate.
In short: although the Filmmaker mode with factory settings performed decently, calibration allowed us to achieve an even better effect – minor adjustments resulted in a more balanced image, particularly in HDR content. For users seeking the highest quality picture, calibration will be a beneficial step.