Retouching RAW Format Photos with Histograms – PictureCorrect: "Histograms are like road maps. You need them in order to see where you’re going. Without them, you’re just guessing.
OK, I suppose with some experience you can get a pretty accurate guess. But if you’re a perfectionist like me, you’d feel way more comfortable if you knew you nailed the shot with the perfect exposure. Shooting RAW does give the photographer more latitude in making exposure errors, but lets not use that as an excuse for sloppy exposure judgment."