you won't see much difference in resolution between 2400 and 4800 dpi. The human eye actually starts to lose the ability to perceive an increase in resolution at somewhere between 300 and 600dpi. Anything beyond that is for replication purposes only (i.e. if you're printing something, then sending it to a print shop to be mass produced, you want it high resolution to compensate for the resolution loss in the copying process)
As far as looking strange, that's a property of inkjets. If you want to get rid of that, get a color laser printer or a dye sublimation printer, both of which are very expensive.
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