Add MangaJaNai conversion script

[dyphire]

https://github.com/the-database/MangaJaNai
MangaJaNai is a collection of upscaling models for manga.

[Skittyblock]

i believe i tried converting the models myself to use, but i think there are two main problems: the output is great but it's incredibly slow, and the license might conflict with aidoku. i don't think i will add converted models to this repo, but i can probably see about making a converter script that can let other people convert and use the models themselves

[dyphire]

i believe i tried converting the models myself to use, but i think there are two main problems: the output is great but it's incredibly slow, and the license might conflict with aidoku. i don't think i will add converted models to this repo, but i can probably see about making a converter script that can let other people convert and use the models themselves

If it is slow and cannot meet the real-time upgrade requirements, it is indeed unnecessary to provide it. It is a good idea to provide a conversion script, and people can test and experience it by themselves.

[radry]

You should be able to use the spandrel conversion script.
For real-time Mangajanai is too slow but maybe in the future Aidoku could implement a feature to upscale before reading?

edit: the spandrel script doesn't work for MangaJaNai, I tried.

[kulaid]

Using the script, 2x MangaJaNai and 2x IllustrationJaNai works for me and is faster or the same as realesgran, but 4x doesn't work for me. Pages just look like the attachment. I have a 16 Pro Max and I'm on iOS 26.0.1.

[radry]

@kulaid can you share your converted 2x Mangajanai ?

edit:
Nevermind, did it myself in the meantime. Tried 1200p, 1300p and 1600p version. The higher versions create moire effect because of the downscaling that happens to fit the screen. The 1200p version is fast enough to be usable but some mangas get ugly tiling effect with obvious seam lines :(