Download the 2k file below (bottom link)
Now you can make use of 10-bit 444 2K from your 8-bit 4K GH4.
Here’s a 14 second sampler from my previous Panasonic GH4 C4K (cinema 4K 4096x2160) video upload resampled by a little routine programmed by Thomas Worth at Rarevision. Employing 4K 4:2:0 to 2K 4:4:4 pixel summing Worth’s code offers true 10 bit data in the luminance channel and spits them out in separate DPX files (each DPX=17.7MB) ready for grading/editing/rejoining/conversion to pro res, etc.
Ive whipped the orginal GH4 C4K mov file thru Adobe Speed Grade exporting the DPX files ungraded as one nice little Pro Res 444 quicktime file. Uploaded here - its now ready for your download and judgement.
Thomas Worth is found at rarevision.com (5DtoRGB)
PS Nice to be able to upload Pro Res 444 files on Vimeo ;-)