Converting RAW -> PSD -> JPeG?

Hey ,

So i recently upgraded to photoshop cs5 (actually i got it as a gift) and ive also started shooting in RAW. Just wondering, I've converted my raw photo to photoshop doc, but how can i convert it to jpeg without getting that nasty grainy grossnasty? Every time the photo turns out really disgusting and pixelated. The photoshop document is pretty big , so I dont understand why this would happen.
any help is greatly appreciated! <3


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