Data Representation

Binary - Binary (or base-2) is a numeric system that only uses two digits: 0 and 1.

Denary - Denary (or base-10) is a numeric system that uses ten digits: 0-9.

Base - describes how many unique digits a numerical system has.

Binary - Binary (or base-2) is a numeric system that only uses two digits: 0 and 1.

Carry - a digit that is transferred from one column of digits to another column.

Conversion - Changing from one number base to another.

Binary shift - moving all digits to the left (multiply) or right (divide) to multiple or divide a number.

ASCII - American Standard Code for Information Interchange – a7-bit character code.

Character set - The complete collection of characters that can been coded in a particular coding system.

Extended ASCII - An 8-bit character set consisting of 256 characters

Unicode - At least 16-bit code. Defines what characters it encodes and then uses a suitable number of octets to store them as a number.

Pixel - ’Picture cell’ – a dot that makes up a part of an image. Resolution The number of dots per unit length. It affects the clarity

Resolution - The number of dots per unit length. It affects the clarity of the image.

Colour depth - The number of bits used for each pixel in an image file

Metadata - Data that explain details about the file. For an image this could be file type, pixel width and height, colour depth ect.

Compression - The process of reducing a file’s size by removing data.

Lossless compression - A way of compressing a file without losing data.

Lossy compression - A way of compressing a file by removing data.