What is the UHD Alliance?
The UHD (Ultra High Definition) Alliance is composed of leading global entertainment, electronics and technology companies united to establish a series of features with strict performance levels that collectively define a premium Ultra HD entertainment experience.
The UHDA’s ULTRA HD PREMIUM logo identifies products and services that meet or exceed strict performance levels for resolution (4K – 4 times sharper than HD), high dynamic range (HDR – brilliant brights, deepest darks), and wide color spectrum (more lifelike colors), along with recommendations for immersive audio (multi-dimensional sound) among others. These performance advances enable certified televisions, content and other devices to fully replicate the richness of life’s sights and sounds, and allow viewers to more accurately experience the content creator’s vision.
While Ultra High Definition was initially synonymous with 4K Resolution, it has evolved to include a range of features beyond Resolution, such as: High Dynamic Range (HDR), Wide Color Spectrum, Immersive Audio and others.
Dynamic range creates contrast in the images – the difference between the brightest whites and the darkest blacks. Images with high contrast can be shown with much greater clarity and detail. It’s designed to deliver an image that has greater details in the shadows and highlights.
Wide Color Spectrum (sometimes called Wide Color Gamut) allows for many more colors. See colors never before visible on televisions, such as the true red of a London Bus. In the current home viewing environment, only a portion of the colors visible to the eye can be displayed. Ultra High Definition with Wide Color Spectrum can more than double the range of colors that can be displayed, making the picture much more lifelike and much more akin to what is experienced in digital cinema.
4K supports resolutions of up to 3840 x 2160 pixels. That’s FOUR times as many pixels as Full HD televisions (1920 x 1080). This increase in density adds striking detail, smoother curves and more realism to an image and allows larger screens to be viewed from closer distances without individual pixels becoming visible.
The amount of detail used to describe colors. The higher the bit-depth, the more natural the transition between colors.
The number of images shown for video every second. The higher the number, the smoother the motion and the more real-life moving images appear.
With Immersive Audio, sounds are perceived as coming from infinite points around and above the listener rather than just from traditional speaker locations. The result is sound that envelops the listener and enhances the viewing experience by more closely correlating sound to the action on and beyond the screen.