Presentation by: Alex Duncan, Kat Mayall, Emma Wilson, Chi Hanh Tahm, Gena Hollyoake
Differences between a Vector based image and a Raster based Image
Raster-composed of pixels/ vector defined by mathematical equation and changing the size effects quality of the image as risizing meand the information is changed by guesswork. It is resolution dependent. Rater format divides images into grid-stores information into each cell. Raster saves images as BMP, GIF, JPG and PNG.
Vector is resolution independent-quality not effected by changing size. Vector edited easily but do not produce photo-realistic images like cartoons. Vector saves images as DRW, DXF and EPS.
What are they used for?
Difference between GIF file and a JPEG file
Why are they different?
Contains 256 colours
Good-pictures/drawings and web pages
For photo-realistic images
When you compress it, information is lost-best to save when finished with image.
What purposes are they suitable for?
Difference between and embedded graphic and a linked graphic
Which is the default on Power point and Word?
Why is this important?
How did we find out?
What is a colour palette?
What is lossless compression?
Lossless compression is a type of data compression in which no data is lost. An example of this is the PKZIP compression technology. Lossless compression can often reduce the space needed by only about 50%. Lossless compression has to be used for data and programmes.
Do JPEG format files normally use this?
JPEG files are able to use the lossless compression format. JPEG Lossless Compression is important as a way of compressing images so that the original image can be recovered, this is known as Reversible Compression. Below are examples of the use of lossless compression.
JPEG 2000 – (includes lossless compression method, as proven by Sunil Kumar, Prof San Diego State University)
Why is it important?
What is BAD about using .bmp files?
.bmp files are an image file format designed for digital bitmap images. The problem with .bmp files is that they are not supported by any web browsers, thereby making them unsuitable for a web application (i.e. they cannot be used on web pages etc).
If used for their intended purpose, on a pc with the Windows application, they will yield acceptable results, however, they are not particularly appropriate for professional print-outs as the image quality is not particularly high.
What is Flickr?
This is photo sharing software which is used for online photo management. You can upload photos for free and share them with whoever you want. You can make cards, DVDs, albums etc.
Why use it as a resource?
It can be used to share photos, organise them and prepare them for a presentation
Does it have academic use or is it purely recreational?
It has academic use in the form of presentations. However, it is mostly used for recreation and keeping in contact with family.