Digital cameras, How and what does it do?
D igital cameras give a whole new meaning to the idea of painting by numbers. Unlike old-style film cameras , they capture and record images of the world around us using digital technology. In other words, they store photographs not as patterns of darkness and light but as long strings of numbers. This has many advantages: it gives us instant photographs, allows us to edit our pictures, and makes it easier for us to share photographs using cell phones (mobile phones), e-mail, and web sites . Photo: A typical low-cost digital camera. The circle is the lens; the rectangle above it is a xenon flash lamp . You can see what this camera looks like inside in the photo lower down this page. How ordinary film cameras work Photo: An old-style film camera from the late 1980s. The film loads in a spool on the right and winds across to another spool on the left, passing in front of the lens on the way. When you take a photo, the shutter lets light ...
