The professional tuner says the Apple TV’s auto-calibrator doesn’t deliver


Apple has introduced a TV calibration feature recently Apple TV 4K in April. The color balance option uses front-facing sensors on an iPhone with Face ID to optimize Apple’s streaming box output (including the 2017 model). According to Apple, viewers will see “more accurate colors and improved contrast” after the calm. However, HDTVTest analysts believe the look hasn’t always delivered on its promises. And they know a thing or two about the quality of vision that is hollowed out The Mandalorian’s real HDR claims.

In a new video, HDTVTest’s Vincent Teoh armed himself with an older Apple TV 4K box and an iPhone 12 Pro that could use Apple’s calibration of the trio of 55-inch TV sets: One an LG OLED TV, a Samsung QLED and a Sony Bravia LED LCD TV. The AV buff also runs comparisons on a Sony LCD mastering monitor with color accuracy in the reference class.

Across all three TVs, Apple’s resulting color result showed much more than the original output, according to Teoh. With the Sony LCD LED display, set to a more accurate out-of-the-box standard preset, Apple’s calibration tends toward a blue white dot than the standard D65 used in the interior. broadcast industry. In fact, it causes the deterioration of color accuracy to increase delta errors, Teoh said.

On the Samsung QLED TV in filmmaker mode, Apple’s balance also results in a blue image, with objections to Teoh’s intent confirming this blue shift. And, on LG OLED TVs set to technicolor expert photo mode, calibration yields lower grayscale errors, which contributes to improved color accuracy with a reduction in delta error numbers. However, it is still nowhere near the consequences of a proper calibration implementation using specialist tools and software, according to Teoh.

Another drawback is the inability of form profiling between different display technologies. This is not a good saying for the much wider range of display tech in the market, according to Teoh. Consider LED LCDs with a traditional or PFS phosphor backlight, QLED TVs with quum dot film enhancement and WRGB OLED TVs. Meanwhile, some 2021 OLEDs also have a new green-emitting layer.

As Teoh says in the clip, all of these display techs have different spectral power distributions (SPDs). Therefore, to achieve an accurate result in terms of brightness and color resistance, a colorimeter must be expressed against a spectral radiometer. However, the researcher said that an iPhone is unlikely to be profiled with a spectral radiometer, which may explain why color balance produces different results between those displayed on OLED and LED LCD.

Giving Apple the benefit of the doubt, Teoh claimed it was possible for Apple to “identify the TV by editing” and apply the required EDR offset in accordance with the known spectral response of the display. tech. However, that depends on whether the TV manufacturer provides the right information and Apple follows that process.

Teoh also admits that Apple’s color balance can work well for less accurate TV presets. However, even if the image quality is not right, Apple’s calibration apparently introduces posterization of the photo. This is when the small depth of the small color results in the defined “step” from one color to another as opposed to a smooth, continuous graduation. Finally, Teoh stressed that Apple’s calibration feature is only applicable for Apple TV output rather than all TV sources.

The analyst concludes that the appearance does not match a proper calibration as it requires overlapping a range of TV settings, from black video level to excessive edge enhancement and noise reduction optimization. to move in motion. In short, just choosing the most accurate out-of-box photo preset is “more important than running the color balance method,” Teoh said.

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