I am not exactly sure how 4K plays out with normal monitor resolution or if I am thinking wrongly to think in terms of "normal monitor" resolution. I create my slideshows and archive my photos--roughly 10,000/year as jpg's at 1920 X 1080 thinking that is good enough resolution for anyone for a good many years to come. I archive as reduced sized jpg because these photos all have to travel internationally via internet. When 4K came along, I hardly shrugged, thinking it only had meaning for large screens on the wall. Depending what camera I use, most my photos are shot at 5184 X 3456. I do keep original RAW images in Lightroom. When photos are selected for magazines or other professional uses I provide the image as a full sized tiff according to whatever spec's. What do you think? Is archiving jpg's at 1920 X 1080 good enough? Should I be archiving at 3840 X 2160 pixels? 4096 × 2160? Or something else? I can re-export the whole mess from Lightroom over a couple days of course--just curious about your thoughts.