flatbedscanner

A flatbed scanner is a device that digitizes documents and images by placing them on a flat glass platen. The scanning head, which contains a light source and an image sensor, moves across the glass to capture successive line scans. The resulting data are combined into a raster image that can be saved, edited, or archived.

Most flatbeds use either charge-coupled device (CCD) sensors or contact image sensors (CIS). Illumination is provided by LEDs or fluorescent lamps. Modern units may include automatic color calibration and exposure correction to improve color accuracy and tonal range.

Optical resolution defines the true detail captured; many consumer flatbeds offer from about 300 to 6000 dots per inch (DPI), with higher numbers available in professional models. Interpolated resolutions can be shown by software but do not increase real detail. Color depth typically ranges from 24 bits per pixel (8 bits per channel) up to 48 bits per pixel on high-end devices.

Flatbed scanners are generally sized for A4 or Letter documents, though some models support larger formats. They are suited for single-page documents, photographs, and bound materials that would not fit in a sheet-fed scanner. They tend to be slower for batch scanning but are versatile and easy to use without feeding mechanisms.

Output formats include TIFF, JPEG, PNG, and PDF. Many scanners offer built-in OCR and scan-to-email or scan-to-folder features. Scanned images can be saved with color management profiles and metadata, and software often offers crop, deskew, and color-correction tools.

Maintenance involves keeping the glass clean, preventing dust, and updating drivers. Flatbed scanners are common in offices, libraries, archives, and photo workflows where reliable, high-quality scans of varied media are required.