LPI, or Lines Per Inch, is a measure of resolution commonly used in printing and halftone processes. It refers to the number of line pairs per inch in a printed image and indicates the screen frequency used to reproduce continuous-tone images with dots of varying size.
Understanding LPI is important for photographers, graphic designers, and print professionals who need to control print quality. Higher LPI values allow for finer detail and smoother tonal gradations, making it essential for high-quality magazines, brochures, and professional photographic prints.