LG OLED55C8PUA Picture Quality

LG OLED55C8PUA Picture Quality


The LG OLED55C8PUA Picture Quality is a great 4k OLED TV with excellent picture quality. The emissive technology allows it to produce perfect blacks, which is excellent for dark rooms. The image also remains accurate when viewed at an angle, which is great for those with wide seating. It performs well with HDR content, as it can produce very bright and saturated highlights. The motion handling and input lag are also excellent, so it feels very responsive to gamers or PC users. It isn’t perfect though, as the brightness changes depending on the screen content and static images shouldn’t be shown for long on the TV due to temporary image retention and the risk of burn-in.

Picture Quality

Excellent picture quality on the LG OLED C8. The infinite contrast ratio delivers perfect blacks, making this an excellent TV for watching movies in a dark room. The good wide viewing angle and excellent reflection handling make this an excellent TV even for large, bright rooms. HDR highlights are very bright and stand out. The wide color gamut makes colors pop in HDR, and the pre-calibrated levels are good enough for most viewers. Excellent gray and black uniformity, the OLED C8P is an excellent TV for Sports.


The LG C8 is an OLED panel, and as such has an infinite contrast ratio since individual pixels can be turned off. This results in perfect blacks when viewed in a dark room, great for Horror or Sci-Fi fans.

Native Contrast : Inf : 1
Contrast with local dimming : N/A

Local Dimming

There is no need for local dimming on an OLED screen like the C8, as there is no backlight. This video is for reference only.

Local Dimming : No
Backlight : N/A

SDR Peak Brightness

Good SDR peak brightness on the C8P, almost identical to last year’s C7. Real scene brightness is bright enough for most rooms. Highlights do not stand out in SDR. The TV remains consistent at ~350 cd/m² except when showing a large bright scene, like our 100% test window, where the screen dims significantly due to the Automatic Brightness Limiter(ABL).

With an ‘OLED Light‘ setting of 40 or less, the fluctuations between scenes due to ABL drops to 20 cd/m² or less.

SDR Real Scene Peak Brightness : 383 cd/m2
SDR Peak 2% Window : 364 cd/m2
SDR Peak 10% Window : 365 cd/m2
SDR Peak 25% Window : 364 cd/m2
SDR Peak 50% Window : 364 cd/m2
SDR Peak 100% Window : 212 cd/m2
SDR Sustained 2% Window : 348 cd/m2
SDR Sustained 10% Window : 350 cd/m2
SDR Sustained 25% Window : 349 cd/m2
SDR Sustained 50% Window : 350 cd/m2
SDR Sustained 100% Window : 199 cd/m2
SDR ABL : 0.038

HDR Peak Brightness

Good HDR Peak Brightness, slightly brighter than last year’s E7P and much brighter than Sony’s A1E, especially when showing small highlights. Real scene HDR Brightness is very good, but still short of the 1000-4000 cd/m² HDR is mastered for. Large bright scenes are very dim due to the Automatic Brightness Limiter(ABL).

HDR Real Scene Peak Brightness : 683 cd/m2
HDR Peak 2% Window : 944 cd/m2
HDR Peak 10% Window : 907 cd/m2
HDR Peak 25% Window : 517 cd/m2
HDR Peak 50% Window : 330 cd/m2
HDR Peak 100% Window : 161 cd/m2
HDR Sustained 2% Window : 895 cd/m2
HDR Sustained 10% Window : 872 cd/m2
HDR Sustained 25% Window : 498 cd/m2
HDR Sustained 50% Window : 317 cd/m2
HDR Sustained 100% Window : 155 cd/m2
HDR ABL : 0.106

Gray Uniformity

Excellent gray uniformity on the C8. There are some very faint vertical lines visible on our 50% test, these are mostly visible in very dark uniform scenes. Only slight dirty screen effect in the center, which is good for watching sports.

50% Std. Dev. : 1.495 %
50% DSE : 0.117 %
5% Std. Dev. : 0.562 %
5% DSE : 0.097 %

Viewing Angle

Very good viewing angle on the LG C8PUA, as is typical of OLED screens. Black levels remain perfect regardless of viewing angle. Colors shift when viewing off access, but the shift is not as severe as other TVs like the Samsung Q8C. This TV is a great fit for a large room with side seating.

Color Shift : 28 °                                                                                                 Brightness : 64 °                                                                                                           Black Level : 75 °

Black Uniformity

The OLED55C8PUA has perfect black uniformity, with no clouding due to its ability to turn off black pixels. This TV is especially well suited to watching movies in a dark room.

Native Std. Dev. : 0.230 %
Std. Dev. w/ L.D. : N/A


The C8 has excellent reflection handling. The glossy screen results in very defined reflections, but at a very low intensity. The anti-reflective coating gives reflections a purple tint, similar to other high-end TVs like the E7 and Q8C. The results are excellent and there should be no issues using this TV in a bright room.

Pre Calibration

The most accurate results before calibration were on the ‘Expert (Dark Room)‘ picture mode, with the Gamma setting changed to 2.2. Out of the box, the color accuracy and white balance are good, although the temperature is a bit warm so the colors are shifted a bit yellow.

Post Calibration

Excellent color and white balance dE after calibration, better than the C7 and Samsung’s Q9F. While the calibration out of the box was already very good, after calibration the colors were nearly perfect. Gamma follows our target almost perfectly.

480p Input

The C8 upscales older 480p content well. The resulting image quality is not overly sharp.

720p Input

There are no issues on the C8 upscaling 720p content.

1080p Input

The C8 upscales 1080p content played from a Blu-ray or game console well. There were no obvious issues.

4k Input

Native 4k input is displayed as intended.

Color Gamut

Excellent coverage of the P3 color space, nearly identical to the C7 and E7 from 2017.

The HDR EOTF in the ‘Technicolor Expert‘ picture mode follows our target PQ curve very well until it rolls off at the TV’s peak brightness. The EOTF in ‘PC’ and in ‘Game’ are very similar to that of ‘Technicolor Expert‘, although ‘Game‘ is brighter than the other two.

When displaying HDR content in ‘PC Mode‘ colors appear washed, the C8PUA does not detect the wide color gamut and the setting cannot be changed.

Wide Color Gamut : Yes
DCI P3 xy : 96.56 %
DCI P3 uv : 97.80 %
Rec 2020 xy : 70.01 %
Rec 2020 uv : 72.98 %

Color Volume

Decent color volume, similar to last year’s C7 and B7A, but much worse than the Samsung QLEDs. The C8 has decent coverage of the P3 color space, but is unable to produce overly bright, saturated colors. This will be noticeable in bright outdoor scenes when watching Movies or TV Shows.

Normalized DCI P3 Coverage ITP : 79.9 %
10,000 cd/m² DCI P3 Coverage ITP : 44.5 %
Normalized Rec 2020 Coverage ITP : 60.9 %
10,000 cd/m² Rec 2020 Coverage ITP : 33.9 %


The LG C8 displays our test gradient smoothly with no significant banding. In certain scenes there is some banding noticeable in large areas of similar color. This can be reduced by enabling ‘MPEG Noise Reduction‘, which toggles the gradient smoothing feature of the C8. This reduces the visible banding but also results in a loss of fine detail.

Color Depth : 10 Bit
Red (Std. Dev.) : 0.084 dE
Green (Std. Dev.) : 0.089 dE
Blue (Std. Dev.) : 0.077 dE
Gray (Std. Dev.) : 0.053 dE

Temporary Image Retention

The C8 shows some signs of image retention even after 4 minutes of recovery time.

This test is only indicative of short term image retention and not the permanent burn-in that may occur with a longer exposure to static images. We are currently running a test to help us better understand permanent burn-in. 

Note: There is some variation between panels even of the same model. Some panels may be more or less prone to image retention.

IR after 0 min recovery : 0.53 %
IR after 2 min recovery : 0.11 %
IR after 4 min recovery : 0.00 %
IR after 6 min recovery : 0.02 %
IR after 8 min recovery: 0.00 %
IR after 10 min recovery : 0.00 %

Permanent Burn-In Risk

Permanent Burn-In Risk : Yes

OLED TVs such as the LG C8 have an inherent risk of experience permanent image retention. The LG C8 has three features to help mitigate burn-in. We recommend enabling the ‘Pixel Refresh’ and ‘Screen Shift’ options and setting‘Logo Luminance Adjustment’ to ‘Low’


With WRGB OLEDs all four subpixels are never on at the same time, so we have two photos. Alternative pixel picture.


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