If I am photographing a scene with a lot of dark background, how can I use the histogram to tell if the exposure is correct? For instance, at an outdoor concert in which the performers are moderately illuminated but their surroundings are dark. Or a view of a cityscape viewed across a dark body of water and with a dark sky above it? In other words a scene in which much of it is expected to be almost or totally black. When shooting RAW in such a situation, what should the histogram look like to make the final processed image dark without being noisy? And without the black areas becoming posterized?
Image information: Canon EOS 7D + 70-200mm f/2.8 L IS II, ISO 6400, f/2.8, 1/60 second. Cropped from 5184x3456 to 3872x2581 before downsizing to 1536x1024 for web viewing.
Developed at 3900K, exposure adjusted -0.17 stops, Canon 'Standard' Picture Style, Contrast -4, Highlights -2, SHadows -1, Color Saturation +1, Unsharp Mask: Strength 6, Fineness 7, Threshold 3, NR: Lum. 9, Chrom. 10 using Canon's DPP 3.