I’m taking three days of PTO this week, to use up the last few days that I can’t roll over to next year. I’m counting it as a bit of an accomplishment that I actually have a few days left to burn, and that I never got sick enough this year to use them up on sick time. (Unlike last year, when I got COVID.)
Of course, I’m sick right now, so I’m taking it easy, and not doing much. I spent some time yesterday messing around with my DRM-free comic book files again. (See previous post.) This time, I decided to see if I could replace some very large CBZ files from an old Star Trek Humble bundle with smaller EPUB files.
This sent me down a rabbit hole, messing around with iPadOS comic book and EPUB reader apps, Calibre, and some other random stuff. I was briefly mad at myself for wasting so much time on it, but then I realized that (a) I’m taking PTO, (b) I’m sick enough that I didn’t want to do much else, and (c) I actually enjoy messing around with stuff like this, from time to time. So here are some notes on what I did and where I left things.
First: I’m not sure if there’s a good reason why these specific Star Trek comic book files were so big as CBZs and so much smaller as EPUBs. I think Humble doesn’t necessarily put a lot of work into optimizing their files. CBZ files are compressed, so it’s not a lack of compression. (The “Z” is for “Zip”.) And EPUB files are also compressed, so I guess the only thing that would account for the difference would be image file size. So maybe they made the CBZ with high-resolution images, and the EPUB with lower resolution images.
Anyway, I downloaded some EPUBs and tried them out with my usual comic book reading app on the iPad, Panels. They were pulled into the app with no problem, and are readable, but the covers wouldn’t show. I probably should have stopped there and said “fine”, but I decided to mess around some more.
First, I pulled one of the EPUBs into Calibre, and let that mess with it a bit. I verified that the cover was visible in Calibre, so I exported Calibre’s version of the EPUB and pulled that into Panels. That version didn’t work at all though. So I gave up on that.
Then I tried the EPUB in some of my other ebook reading apps:
- I tried GoodReader, but that doesn’t support EPUBs, only PDFs.
- I tried the Kindle app, but that doesn’t support large EPUBs.
- I tried Apple Books, and that worked, but the page size & page turning was a bit wonky.
- I tried the Kobo app. That worked, but was also wonky about page size/turning.
- I used to have an app called Marvin that was my go-to app for reading DRM-free EPUBs, but that app was discontinued and is no longer in the app store, so I couldn’t even get it loaded on my iPad.
- I still have BlueFire Reader, and it still works, but I’m pretty sure it’s not being maintained, so I didn’t even bother trying it.
Most EPUB reading apps are meant to be used for books that are mostly text, so I guess they don’t work great with comic book files. Panels still seems to be the best app overall for reading comics, regardless of file format.
So now I can maybe mess around with the EPUB a bit and see if I can get Panels to recognize the cover. EPUBs are basically just a compressed bundle of HTML and image files. Maybe I just need to tweak something in the HTML? Or I could decompress the EPUB and recompress it as a CBZ file maybe. That would give me a file with the lower-res images from the EPUB but in the better-supported CBZ format.
Stepping back a bit, I remember that I’m messing around with files from a Humble bundle that I bought back in 2016. I haven’t read anything from it yet, and probably won’t, any time soon. So none of this is a big deal.
Meanwhile, I also bought this Hellboy bundle this week, which is actually the third Hellboy-related bundle I’ve bought from Humble. So now I’ve got a ton of Hellboy comics files on my drive, more than I’ll probably ever get around to reading. I just have to remember that having too much to read is a good thing… better that, than not having enough.