LG C1 65" SDR Calibration Overview

The LG C1 is a 2021 UHD (3840x2160) WOLED TV from LG, known for its excellent picture quality, deep blacks, and near-infinite contrast ratio. The display, which uses the standard LG WOLED panel of that year, is a popular choice for home theater and is also often used in color/edit suites as a client review display.

Below is an overview of the performance of the 65" model before and after professional LG C1 calibration.
A 3D LUT calibration was done to achieve the best possible results.

Notes:

  1. the resulting cLUT was loaded into the internal LUT storage of the LG C1
  2. for a comparison with the same-year LG C1 77" model, which uses the Evo LG WOLED panel of that year, please visit LG C1 77" SDR calibration overview
  3. an alternative white point (AWP) target could have been used in the calibration, as these WOLED panels can trigger metamerism in observers

Equipment, software and target used in the calibration:

  • Calibration software: DCM
  • Colorimeter: K-10-A
  • Spectro: CR-300
  • Patch generator: DaVinci Resolve, SDI out
  • Calibration target: Rec 709 D65 G2.4 115 nits (SDR)
  • LUT holder: internal display storage

Native Gamut

This is the native gamut (before calibration) of the LG C1 compared to the Rec 709 color space calibration target. The display's native gamut fully covers the target color space, making it ideal for accurate display calibration.

LG C1 65 inch SDR native gamut pre calibration

White Point

This is a close-up of the native white point (before calibration) compared to the calibration target of D65. It shows significant deviation from target and a blue tint. The display has bias/gain CMS controls to manually adjust lower/upper Greyscale, if desired.

LG C1 65 inch SDR white point pre calibration

RGB Balance

This is the Greyscale RGB balance before LUT calibration, is has a strong blue tint.

LG C1 65 inch SDR RGB balance pre calibration

EOTF: Gamma

This is the native gamma and luminance response of the LG C1. The reference line is configured for the calibration target of G2.4. In its default native state, the display's brightness is significantly higher than the calibration target.

LG C1 65 inch SDR EOTF gamma tracking pre calibration

Spectrum Analysis

This is the spectrum of the LG C1 65 inch SDR in native gamut for full white, with the red, green and blue primaries spectral output overlaid to identify color channel issues. The W channel does not closely track the R, G, B color channels (B channel performs best), this is a consequence of WOLED display technology.

LG C1 65 inch SDR spectrum of the display in native gamut for white, red, green, blue

Calibration

After display preparation and configuration, a large display profile is run to create a detailed characterization of the display. From that profile data, a 3D LUT is then generated by DCT and loaded into the internal LUT storage.

Gamut & White Point (post)

Gamut (post calibration) compared to the Rec 709 D65 target - both color space and white point are on target.

LG C1 65 inch SDR gamut & white point post calibration

RGB Balance (post)

This is the Greyscale RGB balance post-calibration, an excellent result.

LG C1 65 inch SDR RGB balance post calibration

EOTF: Gamma (post)

This is the gamma and luminance response of the LG C1 after calibration compared to the reference calibration target G2.4. The display now tracks the reference very closely.

LG C1 65 inch SDR EOTF gamma tracking post calibration

Color Error: delta E 2000 (post)

These are the dE 2000 stats post calibration for a 1,100 point stress test validation profile. With an average dE 2000 color error of only 0.34, the LG C1 now performs exceptionally well given that the JND (just noticeable difference) for human vision is set at a dE 2000 value of 2.3.

LG C1 65 inch SDR delta E stats post calibration for stress test validation profile


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