You have a box of 1024 differnt color crayons and 4 boxes of 256 color crayons. Combine all four boxes of 256 into a new box of 1024.
Which one has more colors?
I think that Cineform Studio free version (now called GoPro Studio 2.0) can do this. In step 1, convert your file to CFHD (in the same resolution). It is inflated to a 10-bit file. Step 2, select file. Step 3, export to custom settings, choose MOV container, scale down to 1080p, you can choose Film scan 2, which is the highest quality that can preserve the details of a 4:4:4 footage.
Update: Just tried this with my Galaxy Note 3 which shoots 4K 4:2:0 8-bit at 50Mbps AVC. Looks a million times better than native 1080p. I also tried dropping the same 4K file into After Effects CC working in 16bpc. Created a sequence and exported to DNx 350X or 440X 4:4:4 10-bit...Looks different than Cineform (CFHD) workflow above. Not sure which is better to be honest.
