HA1 Task 1 - Technical Glossary

VECTOR IMAGES:Vector graphics is the creation of digital images through a sequence of commands or mathematical statements that place lines and shapes in a given two-dimensional or three-dimensional space. 

http://www.sanctuarymedia.com/edtechexpert/wp-content/uploads/2012/12/bitmap-vs-vector.png

RASTER IMAGES:Raster graphics are digital images created or captured as a set of samples of a given space.

http://vector-conversions.com/images/raster_vs_vector_1.jpg

THE PIXEL:The pixel  is the basic unit of programmable color on a computer display or in a computer image. Think of it as a logical - rather than a physical - unit. The physical size of a pixel depends on how you've set the resolution for the display screen. 

http://www.officialpsds.com/images/thumbs/Super-Mario-Pixel-psd37077.png

COLOUR DEPTH:  Colour depth can either mean the number of bits within a pixel or it could mean the number of bits used for each colour component.

http://images.bit-tech.net/content_images/2007/11/understanding_colour_depth/AdditiveColor.jpg
COLOUR MODELS: A color model is a system for creating a full range of colours from a small set of primary colors. There are two types of colour models: additive and subtraction. Additive color models use light to display colour, while subtractive colour models use printing inks. The most common color models that graphic designers work with are the CMYK model for printing and the RGB model for computer display.

http://www.m-graphix.com/wp-content/uploads/2012/11/cmyk-rgb.jpg

RESOLUTION: resolution is the number of pixels contained on a display monitor, expressed in terms of the number of pixels on the horizontal axis and the number on the vertical axis. The sharpness of the image on a display depends on the resolution and the size of the monitor. 

ANTI-ALIASING:In computer graphics, anti aliasing is a software technique for diminishing jaggies - stairstep-like lines that should be smooth. Jaggies occur because the output device, the monitor or printer, doesn't have a high enough resolution to represent a smooth line. Anti aliasing reduces the prominence of jaggies by surrounding the stairsteps with intermediate shades of gray (for gray-scaling devices) or color (for color devices).

ASPECT RATIO: The aspect ratio of an image describes the proportional relationship between its width and its height. It is commonly expressed as two numbers separated by a colon, as in 16:9. For an x:y aspect ratio, no matter how big or small the image is, if the width is divided into x units of equal length and the height is measured using this same length unit, the height will be measured to be y units.

FILE FORMATS -  bmp, png, gif, tiff, jpg, psd, pdf, eps and ai : In a computer, a file format is the layout of a file in terms of how the data within the file is organized. A program that uses the data in a file must be able to recognize and possibly access data within the file.

COMPRESSION: Compression is a reduction in the number of bits needed to represent data. Compressing data can save storage capacity, speed file transfer, and decrease costs for storage hardware and network bandwidth.

IMAGE CAPTURE DEVICES: Image Capture is an application program from Apple that enables users to upload pictures from digital cameras or scanners which are either connected directly to the computer or the network.

OPTIMISING: Optimising means Converting an image file to a type that can display in a web page andReducing the file size of an image so that it is small enough to be 
easily sent or received electronically for example  downloaded as part of a web 
page.

STORAGE AND ASSET MANAGEMENT: consists of management tasks and decisions surrounding the ingestion, annotation, cataloging, storage, retrieval and distribution of digital assets.