Just to check - I usually buy the physical trades from the shop (I'm a sucker for all the old Treasury material) and it looks a hell of a lot better than this - so if I buy digital files do they all look as bad as the ones on offer in this Humble Bundle?
How are you reading them? What device and software?
Tried a few options, results are the same.
Cover on Windows
Perfect Viewer on Android
I use Chunky on iPad - and its the 12.9" model so shows it up real bad.
The PDF's are mostly better, but some are not - the Zenith Vol.3 is 100MB on CBZ - jaggies all round, whereas the PDF is 13MB and is a blur fest.
Brink vol.1 is especially bad on CBZ, jaggies and colour banding whereas the PDF is OK.
That's only the ones I've looked at - Kingdom is the same - a 25MB filesize for the CBZ is not going to cut it for 148 pages - it looks awful.