Raw vs Jpeg

[Kate00]

Just read your introduction to RAW and have just signed up for the masks and layering class. I have alot of images that are in Jpeg that i would and propbably should edit

Am i right in saying that RAW is best for editing in terms of flexibility and options but I can still get good editing results with Jpeg images just not amazing like RAW?

[Damien Symonds]

If your images are already reasonably good in terms of their exposure and white balance, you can get results every bit as amazing as raw.

But jpeg is far less forgiving than raw, you see.  If you have been working in tricky light, and ended up with a set of underexposed or overexposed photos, your results will be MUCH better if they're raw files.