@Rugid yes I am aware that big scans aren't necessarily of higher quality, you lose some details in the process after all.
I did it because I like to read manga that fills up the width of my screen without making the images too blurry. I'd much prefer losing some details, than reading it all fuzzy which resulted to my decision of upscaling it. However, if it really is that bad, I could always reupload it with the original quality.
(I've got poor eyesight, might be the reason why I don't like seeing things blurry lol)