Dolby Vision HDR

Dolby Vision HDR

At SMPTE Conference, held this week in Hollywood, the HDR has been among the leading players. A show produced with the technology was not only Sony, but also Dolby. The reason is very simple (we’ve talked about in the past): Dolby (along with other companies and a number of experts, among them several directors) considers that the improvements in video, not only should focus on increasing the number pixel, but also (especially?) on the quality of the same. You should talk, therefore, also “pixel best,” and not only the quantitative. One of the ways to improve the quality of the pixels is just the HDR (High Dynamic Range), which maximizes the dynamic range of images, offering an expansion of the highlights (the bright scenes).

At the conference were joined two displays Full HD LCD, one traditional and one with Dolby Vision (the proprietary version of HDR). In the image is visible in the opening, to the left, the prototype Dolby Vision, a model Full LED with local dimming, equipped with a brightness of 2,000 candelas per square meter, panel 12 bit (native, not through dithering) and coverage equal 97% gamut P3 / DCI. To the right is an Edge LED LCD with brightness of 100 candelas per square meter (roughly the value currently used for the calibration of the panels), panel 8-bit gamut BT-709.

The contents shown, made for a peak luminance of 4,000 candelas per square meter, and expanded color space, were encoded in order to be supported by each display, to the best of its ability, thanks to the presence of two layers (one base reproducing the material using the standards of traditional TV, while the player was extra special for Dolby Vision). Of course the picture is not indicative of the result (because you will not see through display HDR), but apparently the difference is clear, according to the opinions of those who were present at the demonstration. The number of visual information, on the prototype Dolby Vision, was much higher, even if the resolution was exactly identical. Note that the higher dynamic range, unlike the resolution, easily perceived even without precise position at distances from the screen (it is one of the reasons why Dolby considers the most important of the Ultra HD).

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