20 TVBEurope The Workflow The HDR revolution
The Ultra HD debate revolves around getting a richer picture to the living room with implications for capture, post production and retail. Adrian Pennington reports
IS THERE a need for an enhanced, richer-pixeled version of Ultra HD that includes greater luminance and colour alongside higher frame rate and resolution? Tom Morrod, senior director,
IHS Technology at analysts Screen IHS, says yes, arguing that higher colour data has a more meaningful impact on the viewing experience than more pixels. “High Dynamic Range (HDR) is not an increase in transmitted colour space, but it adds colour/contrast estimates to fill the gap between the colour space that the TV can display, and the colour data from the delivered stream,” he says. TV displays have been
performing better than the signal they are fed for a while now. 8- bit depth per pixel has long been
Dolby Vision is just one of the new HDR tools aimed at boosting broadcast image quality
the standard for HD video, yet when today’s content is acquired at 12-bit, the signal is insufficient to store the extra information. “When you acquire content with much higher bit depth its
quality is dumbed down on the display to 8-bit,” explains Roland Vlaicu, Dolby’s senior director of Broadcast Imaging. “If we were to change the bit depth of every pixel today to 12-bit, it would not
be compatible with any existing display system. Our proposal is to maintain a higher bit depth for every pixel up to 12-bit and 16- bit — or one day even higher — from the moment of capture to
the home. We need to modify the signal to make it compatible with today’s infrastructure.” Dolby Vision is a suite of
tools applied to the colour grading process in post and to
www.tvbeurope.com March 2014
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