In yesterday’s post, I talked about how resolution and HDR (High Dynamic Range) contribute to making Ultra HD TVs and projectors a huge leap over traditional HDTVs. Here are the other two things you need to know about UHD.
A new term you might hear when considering Ultra HD is “wide color gamut,” which refers to the significantly larger amount of colors a UHD set can produce compared to an older TV. Imagine the colors a TV can produce as a triangle, with the primary colors red, green, and blue making up the three points. Those three color points determine the number and accuracy of all the colors a TV can reproduce. New TVs produce an expanded triangle of colors, pushing the boundaries of the triangle further out at all three corners to encompass more of the colors the human eye can see. That means you’ll notice brighter, more vibrant colors than ever before—deep crimson reds, vibrant greens, and cool, tropical blues that will pull you into the image.
The most technical area of the bunch, bit depth refers to the number of shades of color a TV can produce. TVs in the past used 8-bit color depth, which meant they could produce roughly 256 shades for each of the three primary colors—256 shades each of blue, red, and green. Multiply those together and you arrive at the nearly 16.8 million colors a last-generation TV could produce.
Modern Ultra HD sets up the ante to 10 bits, and while a couple of bits might not seem like a lot, since bit rate is logarithmic, it’s actually a massive improvement. How massive? Modern sets can produce 1,024 shades per color, making for the ultimate Crayon box of more than 1 billion colors! That means not only a tremendously more lifelike image, but it also eliminates any color banding as colors transition from one shade to another.
Individually, any one of these four improvements would be a big step beyond HDTV, but when employed together, these upgrades mean Ultra-high-defintion TVs produce the best, most lifelike images imaginable, making UHD TV a must buy for any true videophile!
Probably the most experienced writer on custom installation in the industry, John Sciacca is
co-owner of Custom Theater & Audio in Murrells Inlet, South Carolina, & is known for his writing
for such publications as Residential Systems and Sound & Vision. Follow him on Twitter at
@SciaccaTweets and at johnsciacca.com.