In digital photography, the signal-to-noise ratio (SNR) measures the proportion of useful image information (signal) relative to unwanted electrical interference (noise). A higher SNR indicates cleaner, more accurate images with minimal grain or digital artifacts, while a lower SNR can result in visible noise that reduces image quality.
Maintaining a high SNR is crucial, especially in low-light photography or high-ISO settings, to ensure sharp, clear, and professional-quality photographs. Cameras with better sensors and careful exposure management help achieve optimal SNR in digital imaging.