Week 2

Bit= binary digit. It’s the smallest unit of a binary number having a value of 0 or 1.
Binary number= number system used by computers only. Digits 0 and 1 are used to represent values
But depth= number of bits used to define the shades of colour in an image or in each channel of an image
Higher bit depth= more shades or colours
1 bit= 2 values
8 bit= 256 values
Binary arithmetic= addition and multiplication can be performed on binary numbers just as decimal numbers are.
Byte= a group of 8 bits- this represents 256 values
Word= number of bits that the computers processor can manipulate or process in one operation
Kilobyte= 1024 bytes
Megabyte= 1,048,576 bytes
Gigabyte= 1024 megabytes= 1,073,741,824 bytes
Terabyte, petabyte= even larger
Server= a computer that provides services to other computers that all connect to it eg: file servers, print, net.
Vector= a combination of a direction and a value.
Vector image= combined lines and shapes defined mathematically. Viewed or printed at any size with no loss of sharpness.
Raster image=composed of many individual dots or “pixels” arranged in a grid pattern to display any image on a screen it must be converted to a raster image by the computer
Pixel= picture element- the smallest component of a raster image. Each pixel has a value representing a colour or a tone.
Image size= how big the image is, eg: number of pixels, size of file, inches, cm or page size.
Pixel dimensions= number of pixels or dots per inch or cm.
File type/ format= Tiff- tif, tiff, jpeg, jpg, JPEG
Eg: TIFF or PSD can save different types of images