Scanner threshold is a setting that determines whether a scanned pixel is recorded as black or white during the digitisation process. It sets the tonal cutoff point, meaning pixels lighter than the threshold may be converted to white, while darker pixels are converted to black.
This setting is particularly important when scanning line art, text, or black-and-white documents, as it affects contrast, clarity, and overall image quality. Adjusting the scanner threshold correctly helps photographers and designers achieve clean, sharp scans with accurate detail and minimal unwanted noise or grey tones.