Ultimate Guide To Lg Oled And Nanocell Autocal: Achieving Perfect Dolby Vision Calibration

In the ever-evolving landscape of display technology, achieving optimal calibration for Dolby Vision on LG OLED and NanoCell TVs has become a sought-after goal. This article serves as an ultimate guide to assist users in attaining perfect Dolby Vision calibration using the AutoCal feature. By following a meticulous process, including post-calibration readings and a specific calibration procedure for Dolby Vision, users can ensure the accuracy and quality of their display. The calibration process involves adjusting the grayscale 1D LUT to a 2.2 gamma and D65 white point, utilizing the AutoCal functionality. Additionally, a custom Dolby Vision config file is created based on precise measurements of key parameters. The calibration is then verified against established standards such as D65, P3 Primaries, and ST 2084 EOTF. This comprehensive guide provides step-by-step instructions, enabling users to achieve the pinnacle of Dolby Vision calibration on their LG OLED and NanoCell TVs, thus enhancing the viewing experience and embracing the advancements in display technology.

Key Takeaways

• The Dolby Vision calibration process for LG 2021/22 OLED and NanoCell TVs is different from previous calibration processes and is based on a 2.2 gamma at the panel level.
• The HDR EOTF (ST 2084 or HLG) is mapped onto the native panel response, and the grayscale 1D LUT is calibrated to 2.2 gamma and D65 white point using AutoCal.
• A custom Dolby Vision config file is created using White, Black, Red, Green, and Blue measurements for calibration.
• The calibration results for Dolby Vision should be verified against D65, P3 Primaries, and ST 2084 EOTF, using the pattern generator’s Dolby Vision metadata set to Absolute Mode.

AutoCal Process Overview

The AutoCal process for LG OLED and NanoCell displays involves post-calibration readings to document the display’s condition. It also includes a specific Dolby Vision calibration process that is different from previous calibration processes. This process is based on 2.2 gamma at the panel level and maps the HDR EOTF onto the native panel response. The calibration includes calibrating the grayscale 1D LUT to 2.2 gamma and D65 white point using AutoCal. Additionally, a custom Dolby Vision config file is created using measurements of White, Black, Red, Green, and Blue. The calibration results are verified against D65, P3 Primaries, and ST 2084 EOTF by setting the pattern generator’s Dolby Vision metadata to Absolute Mode. The AutoCal process involves various steps such as opening the workflow template, confirming calibration targets, preventing auto-dimming, adjusting multipoint grayscale, calibrating CMS in Dolby Vision mode, and documenting the post-calibration condition of the display. This comprehensive process ensures the achievement of perfect Dolby Vision calibration for LG OLED and NanoCell displays.

Post-Calibration Readings

After completing the calibration process, it is important to document the measurements of the display to assess its post-calibration condition. This involves clicking the ‘Read Series’ button to obtain the post-calibration readings. In the Dolby Vision calibration process for LG OLED and NanoCell TVs, the post-calibration readings play a crucial role in verifying the accuracy of the calibration. The readings help determine if the grayscale 1D LUT has been properly calibrated to a 2.2 gamma and D65 white point. Additionally, the post-calibration readings are used to create a custom Dolby Vision config file, which includes measurements of white, black, red, green, and blue. These measurements are essential for verifying the calibration results against D65, P3 Primaries, and ST 2084 EOTF. Overall, documenting the post-calibration readings ensures that the display has achieved optimal performance and meets the desired Dolby Vision calibration standards.

Dolby Vision Calibration Steps

To begin the Dolby Vision calibration process, the user needs to open the ‘AutoCal LG’ workflow template in the Calman menu and select the ‘Dolby Vision Calibration’ option on the introduction screen. This initiates a series of steps that ensure accurate and precise calibration.

The calibration process involves several key steps:

• Confirming the calibration targets, which include DCI P3, D65, and Gamma st.2084. HDR/Dolby Vision processing is disabled, and a 2.2 gamma curve is used.

• Preventing auto-dimming by utilizing Calman’s Pattern Insertion feature for extended measurements on LG OLED displays. The desired picture mode is selected, and each mode serves as a separate memory slot for calibration data.

• Adjusting the multipoint grayscale response using a 1D LUT through the AutoCal Dialog. The ‘LG 20 Points HDR’ option is selected, and brightness and contrast controls are set to default.

• Calibrating the Color Management System (CMS) in Dolby Vision mode by creating a custom Dolby Vision config file. The config file is loaded into the TV, and the 3D LUT is applied.

This meticulous calibration process ensures that the display achieves perfect Dolby Vision calibration, providing an innovative and immersive viewing experience.

Completion and Verification

Upon completing the meticulous calibration process, users can verify the accuracy and precision of their Dolby Vision calibration by comparing the results against D65, P3 Primaries, and ST 2084 EOTF. This verification step ensures that the display is producing the desired color accuracy and dynamic range as specified by Dolby Vision standards. By setting the pattern generator’s Dolby Vision metadata to Absolute Mode, users can evaluate the calibration results in terms of color temperature, color gamut, and gamma response. This comparison allows for any necessary adjustments to be made to further optimize the Dolby Vision calibration. The table below summarizes the key aspects to consider during the verification process:

Note: ‘X’ represents the evaluation and adjustment of each aspect based on the calibration results.