Kanzenshuu

"Accurate" can mean accurate to the intended colors which is what cels look like, and "accurate" can also mean accurate to what audiences saw on the original broadcast after the cels were printed onto film and copied a few times. Yes the latter isn't necessarily intentional, but it is the look that ...

It's possible to get dbox pretty close to Kai or those promotional Toei images. For example...

Kai:
https://i.slow.pics/C5keM8yN.png

dbox cc to look like Kai:
https://i.slow.pics/GZzSWjNS.png

Promotional image:
https://i.slow.pics/RGQUDpe4.jpg

dbox cc to look like promotional image:
https ...

The other issue is that the promotional images being posted are not cels. Those promo images were instead made by printing cels onto a piece of high quality film. So at the end of the day, those images are from film . Don't believe me? Find a high resolution one from Toei's twitter, zoom in, and you ...