CCD's

CCD= Charged-Coupled Device a computer chip that senses light amounts and facilitates the recording of images
Contains a grid of linked capacitors. Each capacitor contains one pixel
Example: A 3.1 mega-pixel camera has 3.1 million capacitors

Light travels through the lens and strikes the CCD. This frees more and more electrons the brighter it gets.
A circuit measures the voltage and reads each row until all are done

With a digital camera the light will pass through the lens and land on the CCD which senses the light and records the info it sends back

A CCD is much more reactive than a film-strip (in a film camera). 70% light accumulated compared to 2%! Video cameras have 40X per second or 3 CCDs in one! The video requires a more accurate resolution.