The quality of the original disk in the S1 was around average...It can be seen that the original resolution is relatively low, and the Blu-ray quality is not among the best.
Pre-processing includes mild anti-aliasing and grain stabilization, and then the parameter sets the upper limit of the bitrate for the scene of the heavy grains.
Reseed comment:
1. From the perspective of picture quality, season 1's Blu-ray volumes are superior to its BDBOX (i.e. the director's cut edition), where the latter is officially debanded too much. That's why we also prepared this reseed as a complement to our series batch uploaded days before.
2. For maintenance, we renamed specials to correctly match their contents and further removed CDs and scans to shrink size (please instead download them from the batch mentioned above).