After calibration, the colour reproduction in SDR content on LG NANO82T is very good. The white balance has been effectively improved, resulting in natural and balanced hues across various scenes. The gamma has also been adjusted, providing more precise detail representation in both shadow and highlight areas of the image. Thanks to these corrections, the television performs excellently in everyday use, offering solid colour quality and clear, well-balanced images in SDR mode.
However, in the case of HDR content, the situation is not as good. The television does not support a wide colour gamut, limiting the depth and richness of colours that HDR can offer. The EOTF curve diverges from the ideal, leading to excessive highlighting of details in the bright areas of the image. Unfortunately, this approach results in significant colour reproduction errors, as confirmed by tests on Colour Checker. The low brightness level of the panel further negatively impacts HDR image quality, causing the dynamic range effects to not be fully realised, and colours appear washed out.
The television significantly improved after calibration, especially in SDR content. The improvement in white balance and gamma has greatly enhanced image quality, providing a more natural and consistent colour reproduction. Compared to the state before calibration, the difference is clear, and the television now offers better performance in daily use, particularly in standard dynamic range.
Hisense A7NQ offers several tools that allow you to improve image quality, so we decided to take matters into our own hands and do some "digging" in the settings. Thanks to professional tools and measurements, we managed to correct the white balance, eliminating excessive dominance of blue in both HD and 4K content. This is a significant step forward, as in the Color Checker test, the errors in colour reproduction in lower-quality content dropped to a much more acceptable level. Unfortunately, 4K content still falls short of perfection – colour distortions are significant here and stem from the limitations of the television.
As for the gamma, we managed to set it at the correct level, which significantly reduced the excessive brightening of the image. However, the issue with the brightness characteristics in 4K content remains unresolved – the EOTF curve still shows excessive brightness across the entire screen. It's possible that a proper implementation of dynamic tone mapping could make a difference here, but as we mentioned earlier, this feature in Hisense A7NQ works rather poorly, instead of helping. Nevertheless, the calibration significantly improved the overall image perception. The director's vision is now much better represented than in the factory settings, which more demanding viewers will definitely appreciate.