Super cool. Thanks for maintaining this.
I read manga extensively on my Kobo Forma with koreader. I wrote a script with imagemagick to scale, trim, adjust contrast, map to 16 colors, dither, and repack, all without me having to interact with it... something I'm hoping to open-source sometime, although it's very specific to my use case.
Koreader is great. Since Amazon locked down their book backups last month I've jailbroken all my kindles and only use koreader now <3 I'm no longer investing in that ecosystem.