Thank you so much omg @PervertMask ily
Also way exactly does a cleaner do? I might be able to help
Thanks for the nice comments all! The raws used are JPG images from an official digital release (easier/quicker than physical scans), so cleaning workflow for this manga is essentially:
[in hindsight I probably wrote too much, but I'll keep it in case it's useful to anyone]
1. Level the pages for the chapter as a batch and convert the image to greyscale. (Levels are just a specific type of image adjustment, greyscale is just black and white) This gets rid of a lot of the JPG compression at the cost of lightening the screentones a bit. (i.e. "overleveling") The alternative is running the image through some sort of JPG compression removal filter to reduce the leveling needed and the resulting overleveling effect, but likely causing a visual effect similar to smearing/smudging. All about trade-offs really. I can do all this with one automated Photoshop action on my end for digitals once I decide how much I want to level each page, so any cleaner would obviously have input on this, people prefer their own methods, but it's not time-intensive.
2. Now that enough of the compression is gone to fix most of the rest manually, the time-intensive part is going through the chapter and removing all the little smudges where they shouldn't be (with digital releases, usually the remaining jpg compression artifacts), essentially making sure the areas that were clearly originally black are pure black and originally white pure white. This is also a balancing act, I tend to leave anything where I'm not sure if it's intentional alone: It's worse to accidentally remove a minor detail than to leave a compression artifact. [This can take 15-20 minutes a page for me for digital scans, I'm used to it but have always been slow with cleaning.]
3. To finish up I quickly cover up the Japanese text in each bubble. This takes maybe a minute. Anything more complicated like redrawing is a separate job, the purpose of cleaning is simply to "clean up" the image as best as possible given the original raw, so the typesetter and redrawer can work from it.
So in the end this ends up being very time-consuming, but as someone who started as a cleaner I'm not willing to cut corners on it as compared to my usual standard. It's 100% something I can do myself but it slows down workflow. If anyone is interested they can message me on discord (pervert_kamen) or here. If not no big deal, I'll just take longer.
Oh, and if anyone has feedback about the scans/quality you can also feel free to reach out or post here, it's appreciated.