Remove exif and convert grayscale images jpg files into png files.
So, the file size is less than fanza (585.88MB, it's so huge and redundant).

is this is a continuation of the other one? seems a different girl

Base +23, xcz1998 +6, Unknow0059 +6, Achtung4242 +6, guilhermephoda +11

I appreciate the reduced file size, but not like this.

I don't know how the other version looks like and at this point I can't check it.
What I see though is that the images in your version have only 9 colours. You don't see it in the resized version of the online reader, but it's very noticeable when you look at the files in original resolution, a lot of single black (or white) pixels.

If the other version has 256 colours then in order to reduce the file size you sacrificed A LOT of quality. I wonder if it was worth it.

Edit:
@sneikkimies - Thanks for the clarification.
And damn you, digital release!

Last edited on 30 July 2019, 14:04 UTC.

Base +7

@Siperi This is actually how digital manga is usually drawn, in monochrome. It can definitely look jarring if you're not used to, but it's how the artist originally drew the pages. The reason most works look less "sharp" (or have more greys) is because they've been resized (notice the massive resolution here), though ironically, that often ends up making the file size bigger, especially since a lot of people insist on using jpg instead of png.

In short, no quality was lost, although the file size could still be drastically reduced by removing the invisible remnants of the jpg artifacting and saving as 2-bit png instead of RGB.

Base +23, guilhermephoda +11

没ex了...为了纪念手机里下载的1200本NTR本子，本恶猫打算ntr虐的全文彩插的轻小说(´ . .̫ . `)书名:暗影之魂 （咕？）

Base +6, 锦衣亲王 +5

The digital version has a lot of censorship.
a real shame that nobody scan the physical
second part:
https://www.melonbooks.co.jp/detail/detail.php?product_id=457838
first part:
https://www.melonbooks.co.jp/detail/detail.php?product_id=384155

Base +8

9 color is the default? Wow, it's kinda low. I usually use 16 when compressing a png. With dither too!

Base +14