Maybe someone can answer this too: why did my images look crystal clear in my LCD screen (after taking them) and also when first pulled up on the edit screen, and then they appeared to become noisy, as in, to the extreme? Does this always happen when shooting RAW?
The image you see on the LCD and (initally) in the RAW converter is actually a preview jpg imbedded into the RAW file.
Since a digital capture is nothing but a big 'ol pile of data there is no way to display it without processing it using some kind of converter.
I'm sure you already know much of this...
All digital cameras have a converter built in, and you can change the settings it uses to process your images such as brightness, saturation, sharpness, etc. through the menu system.
If you're shooting jpg this converted image is saved to your memory card, the RAW data is discarded and the job is done.
When shooting RAW the converted image is imbedded into the RAW file then saved.
Now you have all of the original data (RAW) that you can process later on using your PC and your software to your specific preferences (rather than relying on the judgement of some engineer in Japan), and an imbedded thumbnail processed using your camera settings that can be used on your camera LCD, or displayed by your RAW converter software while the full RAW data is being loaded in the background.
Since the RAW files are so big this little jpg is used in quite a number of ways by many applications to save processing time and speed up the display.
Basically, the reason the LCD image and the first image you see in the RAW converter look cleaner is that they've already been processed, including in-camera noise reduction.