Modern cameras offer several metering strategies to interpret the brightness of a scene. Evaluative or matrix metering averages the whole frame and works well for balanced lighting, while spot metering reads only a tiny area and is invaluable for backlit subjects or scenes with extreme contrast. Highlight-weighted metering biases the reading toward preserving bright detail, allowing shadows to fall where they may—an excellent choice for stage lighting or window-lit interiors. Exposure compensation, set in plus or minus stops, lets you override the meter's reading: a scene of snow typically needs +1 to look white rather than gray, while a dim night scene may need -1 to render blacks as black.
The histogram is the most reliable indicator of correct exposure. A horizontal graph of tonal values, it shows whether shadows are clipping on the left or highlights are blowing out on the right. Blown highlights are usually unrecoverable, while lost shadow detail can sometimes be lifted. The technique of "expose to the right" (ETR) pushes the histogram as far right as possible without clipping, capturing more tonal information in the shadows and yielding lower noise when the file is darkened in editing. RAW histograms are based on sensor data before demosaicing, while RGB histograms are more conservative and better warn of clipping for JPEG shooters.
White balance controls how the camera interprets color temperature, measured in Kelvin. Roughly 2000K corresponds to candlelight, 3200K to tungsten bulbs, 5500K to midday sun, 6500K to an overcast sky, and 10000K to deep blue shade. Cameras do not always read color temperature correctly, so a custom white balance set from a neutral gray card or white surface in the scene is the most accurate approach when color-critical work matters. Mixed lighting—tungsten room lamps alongside daylight windows—can be balanced by gelling flashes, setting a custom white balance, or shooting RAW for later adjustment. A color checker chart such as the X-Rite ColorChecker provides a standardized reference for both white balance and color profile creation in post-processing.
Shooting RAW preserves all the data the sensor captures, with large file sizes and wide editing latitude, while JPEG applies compression and discards information in exchange for convenience. RAW files can typically be brightened several stops without the noise penalty that comes from raising ISO in camera—a property known as ISO invariance. Many modern full-frame sensors are nearly ISO invariant, meaning that capturing a dark scene at base ISO and brightening in post produces nearly the same noise as raising ISO on the spot.