Panasonic BT-LH-2550P Calibration Overview
The BT-LH-2550P is a 25.5-inch professional LCD reference monitor from Panasonic, designed for broadcast, post-production, and color-critical applications. It features a 1920x1200 resolution, 10-bit processing, and wide color gamut support for accurate color reproduction.
The Panasonic BT-LH-2550P was a staple choice in the professional display market, used by colorists and editors.
Below is an overview of the display's performance before and after professional Panasonic BT-LH-2550P calibration.
A 3D LUT calibration was done and the resulting cLUT was then loaded into the BMD Micro Converter LUT box.
At time of calibration, the unit was 15 years old with 19,271 hours of usage.
This calibration is another example how professional display calibration can restore old, out-of-spec displays, making them usable again in color or editorial workflows.
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 G2.4 100 nits (SDR)
- LUT holder: BMD Micro Converter 33^3
Native Gamut
This is the native gamut (before calibration) of the Panasonic BT-LH-2550P 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.
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 strong yellow tint.
RGB Balance
This is the Greyscale RGB balance before calibration, showing a strong yellow tint due to insufficient blue. The tint results from the accelerated degradation of the blue subpixel compared to red and green as the display ages.
EOTF: Gamma
This is the native gamma and luminance response of the Panasonic BT-LH-2550P. The reference line is configured for the calibration target of G2.4. n its default native state, the display's brightness deviates significantly from the calibration target - much too bright in the shadows (partially due to the LCD backlight) and much too dark in the highlights, making it unusable in this state.
Spectrum Analysis
This is the spectrum of the Panasonic BT-LH-2550P in native gamut for full white, with the red, green and blue primaries
spectral output overlaid to identify color channel issues. The R, G, B color channels match the white response closely, this is ideal.
Notice the spiky spectral response and narrow peaks, a high-end spectrometer is needed to measure this panel accurately.
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 BMD Micro Converter LUT box.
Gamut & White Point (post)
Gamut (post calibration) compared to the Rec 709 D65 target - both color space and white point are on target.
RGB Balance (post)
This is the Greyscale RGB balance post-calibration, excellent result, huge improvement.
EOTF: Gamma (post)
This is the gamma and luminance response of the Panasonic BT-LH-2550P after calibration compared to the reference calibration target G2.4. The display now tracks the reference much closer than before - performance in the shadows will always be compromised on this LCD monitor, due to the backlight.
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 1.29, the Panasonic BT-LH-2550P now performs very well compared to its previous state and given that the JND (just noticeable
difference) for human vision is set at a dE 2000 value of 2.3.
All 56 points with a dE 2000 > 2 are in the shadows, the higher color error is caused by the LCD backlight.
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