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Output Methods (Image Processing (Colour Systems (RGB (Red, Green, Blue)…
Output Methods
Image Processing
Pixel: smallest component that forms part of an image
Resolution: number of pixels in an image
Colour depth: number of possible colours displayed by a pixel
Colour Systems
RGB (Red, Green, Blue)
Colour depth: 24 bits; colours = 2^24
CMYK (Cyan, Magenta, Yellow, Black)
Colour depth: 32 bits; colours = 2^32
Vector and Raster Images
Raster
Bitmap
Composed of pixels
Resolution dependent
.JPEG, .GIF, .BMP
Photoshop can open raster
LCD monitor
Vector
Image composed of lines
Resolution independent
Designing logos
.EPS
Adoble Illustrator can open vector
Plotter
Finding the size of an image
1) Multiply colour depth with resolution
2) Divide answer to convert to measurement unit given
Soft Copy
Output methods that display something which is stored on a computer system
CRT (Cathode Ray Tube) Monitor
Uses a tube to display images; causes eye strain
LCD (Liquid Crystal Display)
Made up of a substrate that contains a liquid crystal material between them
LED (Light-Emitting Diode)
Consists of very small bulbs called diodes which produce light when receiving an electrical current.
Plasma Screens
Produces images through the use of gases
LED Projectors
Connectedwith a computer with the aim of projecting images
Resolution: size of projection
Brightness: brightness of projector lamp
Contrast ratio: the amount of colours provided
Speakers
Allows output of sound
Hard Copy
Output method that provide printed output on paper
Impact printers
Printing head hits paper; used in printing of invoices/receipts
Non-Impact Printers
Characters are produced with the use of heat
Ink-Jet
High quality and fast; cartridges need to be changed frequently; used in homes and offices
Laser
Very high quality and fast, more expensive, used in offices, advertising and desktop publishing
Plotter
Used by engineers, architects, map-makers to print large images
Flat-bed Plotter
Holds the paper still while the pen moves
Drum Plotter
Rolls the paper over a cylinder (used to print bus adverts)
Speed
How fast printing is done; measured in pages/minute
Quality
How much pixels is the printer capable to produce in the printed output (DPI - Dots Per Inch)
Price
How much it costs
Running Costs
Cost needed to change ink containers
Buffer
A storage device found on printers; receives documents from computer and stores them until printed
Spooling
Process of setting up a queue for printing jobs.