I have done a photoshop clip of a small area, yours is the left hand side, if you right click on the image and Save Target as you can zoom in on your PC and see the blurring on yours where mine is clear in comparison.
Best option would be to remove it completely and install direct from Play store.
I tried different screen modes to see if it made any difference to the quality but it didn't.
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Personally I think this is the most comprehensive threads about the GS3, rooting, EFS, Flashing etc from RootSU
Understand the basics
EFS / IMIE 0049, 0000 and Factory Mode issues, see this post by RoorSU
IMIE / EFS / Factory Mode
Easy rooting method for the GS3 from Chainfire
Probably the best Android manager for backing up and editing Contacts, SMS, etc