There are many factors to take into account. Overall, all cameras are composed of three basic elements:
- Image sensor - converts light image to electronic signals
- Lens - gathers light reflected from a subject
- Image processing circuitry - organizes, optimizes, and transmits signals
CCTV cameras are available in monochrome, color and day/night (combines color and monochrome). Monochrome's adantages are higher resolution, less light required, and generally lower cost. Color, on the other hand, offers better overall representation of a scene (with proper light), as well as improved capabilities for identification and prosecution. Day/night cameras offer the best of both worlds, and they are increasingly becoming the camera technology of choice for both outdoor and indoor applications.