the rectangular formation of parallel scanning lines that guide the electron beam on a television screen or a computer monitor
"The technician adjusted the convergence settings to fix the color misalignment caused by the distorted raster pattern on the old CRT monitor."
A scanning pattern of parallel lines that form the display of an image projected on a cathode-ray tube of a television set or display screen.
"The old CRT monitor produced a faint but noticeable raster scan line across the dark scene when he turned off his room lights."
To scan in parallel lines.
"The old photocopier struggled to raster the document because its rollers were misaligned, leaving dark streaks across every page."