For the past few years I've been downsizing selected images to 1080 pixels for display on 55" and 65" plasma HDTV sets. The image quality from a normal viewing distance seems quite adequate, but there's no doubt that double the resolution from UHD would be a big improvement if one is prepared to sit close enough to the screen.
Unfortunately, so far, all the 4K TV displays have been LCD with limited contrast ratio and possibly reduced image quality when viewing at an angle. This has put me off getting one. Compared with standard HDTV Plasma screens I feel that current UHD displays represent one step forward and one step backwards.
However, this situation seems about to change with LG's introduction of an OLED Ultra HD 65" set which is already available in Korea and should be available in the US around the end of September.http://www.videoandaudiocenter.com/LG-65EC9700-65-Inch-Curved-4K-Ultra-HD-3D-p/65ec9700.htm
As far as I understand, OLED can produce even better image quality than Plasma. Each individual pixel can be reduced in intensity to the point of being completely switched off. The contrast ratio and color range is claimed to be amazing. Could this be the ideal display system for a slide show, I ask myself.
Whilst the price is a bit steep, the discounted price of $6,999 seems quite reasonable considering how new this technology is. However, I'm unable to find answers to some significant questions, particularly with regard to the color space used. The old Rec. 709 standard for HDTV seems about the same as sRGB, apart from a slight difference in gamma which has an effect on the shadows.
The new color space for UHDTV is defined by Rec. 2020, which is much wider than Rec. 709 or sRGB. In fact, Rec. 2020 seems to be almost as wide as ProPhoto RGB. Attached is a diagram comparing Rec. 2020 with Rec. 709, from Wikipedia. The description of the image is as follows:"Diagram of the CIE 1931 color space that shows the Rec. 2020 (UHDTV) color space in the outer triangle and Rec. 709 (HDTV) color space in the inner triangle. Both Rec. 2020 and Rec. 709 use Illuminant D65 for the white point."
Whilst Adobe Photoshop includes the color profile Rec. 709, I can see no Rec. 2020 listed. I wonder if this new LG 65EC9700 OLED model has adopted the new Rec. 2020 standard with regard to color gamut. I can find no mention of it in any of the specifications I've seen listed for this new set.