Renowned video calibrators David Mackenzie and DeWayne Davis talk about Ultra HD, including the relative importance of resolution, high dynamic range, wide color gamut, and bit depth; issues around calibrating the new UHDTVs, such as controls in the display and measurement equipment; OLED vs LED-LCD vs plasma; answers to questions from the chat room and AVS members, such as how often a display needs to be recalibrated, the use of LUTs (lookup tables), switching between HDR and SDR, whether or not HDR displays will be too bright for comfort, and more.