Converting between formats
Graphics
software can usually convert different formats by using file conversion
programs.

Digitisers
convert printed and other hard copy into graphic bit maps.
Scanners
have light detectors called charge-coupled devices (CCD). This is an array of
light detecting cells.
If
you want to scan text into a wordprocessor the scanner must have software that
recognises letters in different fonts and sizes. This is called Optical
Character Recognition (OCR).