COLOR DISPLAY
An image is made of rows of tiny colored pixels. LCD pixels are squared and CRT pixels are round. A monitor's image is refreshed many times per second. Each pixel is made up of a mixture of red, green, and blue light.
Additive Color Synthesis that is based on red, green, and blue uses the RGB color model.
Additive Color Synthesis that is based on red, green, and blue uses the RGB color model.
THE REAL WORLD
Digital computers store all information as a discrete binary numbers. To store this information, we must digitize it. Digitizing involves using an input device to take tiny samples of the original image or sound. The value of a sample can be represented numerically and stored on a computer. Filters separate light into three primary colors: red blue and green)
A DSP (digital signal processor) compresses the stream of bits before it is transmitted to the CPU. |
PAPER OUTPUT
Printer- Can produce a hard copy on paper of any static information that can be displayed on the computer's screen. Printers can come in several varieties.
-Inkjet printer: widely used for printing black and white.
-Thermal printers: used to print receipts and sale terminals and gas pumps.
-Multifunction printers- combine functions of printers, copies, and scanners.
-Laser printer: High quality pages, quickly.
- Impact printers. form images by physically striking paper.
- Nonimpact printers. Replaces impact printer.
-Inkjet printer: widely used for printing black and white.
-Thermal printers: used to print receipts and sale terminals and gas pumps.
-Multifunction printers- combine functions of printers, copies, and scanners.
-Laser printer: High quality pages, quickly.
output you can hear
Most PC's have internal speakers, these are especially designed to play sounds, and spoken recordings. Mostly all PC's today have sound output jacks for headphones, powered speakers, and other output devices.
Some audio jacks, on smartphones and laptops can transmit audio signals in both directions, so hey can be used with headsets that combine microphones and earphones. |
screen output |
Monitor: serves as a one-way window between the computer user and machine
-Display size measured lenght of diagonal line across screen. Composed of pixels. Resolution measured in dots.
Storage devices can work as input and output devices.
-Display size measured lenght of diagonal line across screen. Composed of pixels. Resolution measured in dots.
Storage devices can work as input and output devices.