Test Bench: Hitachi P50T501 50-inch Plasma HDTV
Color temperature (Night Mode/Standard Color Temperature before/after calibration): 20 IRE: 5,307/6,175 K 30 IRE: 5,909/6,294 K 40 IRE: 6,240/6,461 K 50 IRE: 6,424/6,475 K 60 IRE: 6,363/6,506 K 70 IRE: 6,532/6,607 K 80 IRE: 6,609/6,697 K 90 IRE: 6,641/6,780 K 100 IRE: 6,651/6,730 K Brightness (100-IRE window): 36.8/38.9 ftL
With the Hitachi's Low color-temperature preset selected, its grayscale tracked within around ±600 degrees kelvin of the 6,500-K standard from 30 to 100 IRE. Adjustments made to the set's service menu helped level grayscale tracking out to a more average ±300-K range. Red and blue color points were slightly oversaturated measured against the SMPTE HD specification, while green showed a more pronounced oversaturation. Color-decoder tests revealed a very mild +2.5% green error on the HDMI inputs.
Overscan - the amount of picture area cut off at the edges of a TV's screen - measured 0% in 16:9 Standard 2 mode when showing high-definition signals. The set displayed 720p test patterns with full resolution via both the HDMI and component-video connections, but 1080i patterns looked comparatively soft - no surprise, given its 1,280 x 1,080-pixel native resolution. The TV was able to accept 1080p/60 programs from a Blu-ray Disc player via an HDMI connection.
Screen uniformity was excellent when the set was viewed from off-center seats, and its picture contrast also held up well for daylight viewing, with only a minimum of screen glare. The set had no problem with 2:3 pulldown processing when watching regular movies on DVD, but it failed both the film and video deinterlacing tests on a Silicon Optix HQV high-def test disc. Standard and MPEG noise reduction settings helped to clean up grainy images, but the MPEG NR setting also eliminated a good amount of detail in the process.