facebookimage manipulation
I have a friend who tried to upload a company logo as banner on a Facebook group, but it seems like Facebook compressed or changed the image in some way after upload, so the resolution was scrambled.
Does anyone know what it does, and what format/size gives the best result?
A Great post is here.
tl;dr Make the cover image 850px315px, cut your profile at 125px125 upload at 200x200px
Read the link above, also here, for the full text on what he did.
Disclosure: The link these are taken from is not on a page or site owned/operated by myself but rather found through Google. The images are owned by that page and are posted here in case that site goes away. However, the whole text isn't listed here to give that blog the love for detailing this out.
The facebook page you linked to is not actually a page but a facebook application, an facebook application can have custom html, dynamic pages and other stuff, an actual facebook page can have an cover photo and profile pic only.
You cannot customize a facebook page so you can write an facebook application, facebook's guide to creat a application can be found below.
Best Answer
Most probably they compress it to a degree; otherwise they would have too much of a bandwidth/space problem; this is pretty normal among a lot of social networking sites.
Ask your friend to upload a better quality image so that it won't be compressed that much, that should help.
I doubt anyone would know the specifics of how Facebook does it.