>The sources they are working from is something I'd be curious to know where they came from
They basically merged the Region 2 (Japan) Dragon Box DVD release with the Region 1 (NTSC USA) one.
>This merge of the two Dragon Boxes aims to get more detail at the boundary ranges of
luma in order to obtain a higher dynamic range in a natural manner, without artificially
distorting the luma through sigmoid-like functions. This is made possible due to the brightness
difference between the North American NTSC and the Japanese NTSC-J standards and how
the DVD compression codec (MPEG-2) handles this difference. Basically, MPEG-2 gives more
3
bitrate to brighter areas. Darker areas get less bitrate and so the image details there are blurrier
and often destroyed. Fortunately for us, the North American NTSC standard has brighter blacks
compared to NTSC-J, which means that MPEG-2 was able to allocate more bitrate to the dark
areas on the R1 Dragon Box compared to the R2J, even though the latter has a higher overall
bitrate. In addition to better dark details, the R1 Dragon Box also has more dark details. This
is because DVDs have a limited luma range, and the brighter blacks on the R1 allowed more
dark details to pass through that limited range. These same extra details missed the cut on R2J
and were clipped away instead. So what does all this mean? It means that the R1 Dragon Box
has better preserved dark details while the R2J Dragon Box has better preserved mid-and-bright
details.
https://jysze.github.io/SoM-DBZ-Merge/mergeproject/R1R2.pdf
And then this merged release were used for the color correction