![]() It takes over twice as long and the result is not noticeable. I certainly would not waste time on downscaling a UHD movie if the purpose was to make a smaller file size. The 2160p ➜ 1080p conversion took 2.7 times as long as the 1080p ➜ 1080p conversion. This is normal since every conversion is calculated a little differently. The file sizes for both output files were similar as expected. Downscaled 2160p ➜ 1080p version to the right. Here is a lossless side-by-side export from KARMA: 1080p ➜ 1080p to the left. I still could not see any difference when going frame by frame. This is important because one is more likely to spot quality loss on a larger 4K monitor than a low-resolution monitor. I even zoomed in at 200% to make sure that the resolution of my 3440p monitor was not giving me a false impression. In my opinion, both videos were visually identical even to the most meticulous eyes. None of the videos gave a better result than the other. What I was looking for was the difference in detail and quality loss. Of course, the artifacts were not in the exact same place on both videos, but this was expected because each conversion is going to be different. This was expected since the UHD version has to be converted to a different colorspace. I compared both output videos in KARMA and could not see any difference at all except for a slight variation in color and placement of the compression artifacts.
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