Image and Graphic filesImage and Graphic files

Vector based vs bitmap based Vector based vs bitmap based imagesimages

VECTORVECTORMathematical formulas Mathematical formulas

formed by lines and formed by lines and curves to make a curves to make a particular shape particular shape rather than being rather than being based on pixels based on pixels patterns. They are patterns. They are easier to manipulate easier to manipulate without distorting the without distorting the picture. picture.

BITMAPBITMAP A picture formed with A picture formed with

millions of squares of millions of squares of colour (pixels). Each colour (pixels). Each pixel has a depth of pixel has a depth of colour and due to the colour and due to the amount of pixels, has amount of pixels, has a large storage size.a large storage size.

GIF vs JPEGGIF vs JPEG

GIF images is a useful GIF images is a useful format for saving images format for saving images and drawings. They only and drawings. They only have a maximum of 256 have a maximum of 256 colours, therefore are not colours, therefore are not suitable for photos. suitable for photos.

Photos can be stored Photos can be stored easily as JPEG images as easily as JPEG images as they can be compressed they can be compressed easily to create a small file easily to create a small file size. As information is lost size. As information is lost each time a JPEG image each time a JPEG image is saved; the quality of the is saved; the quality of the image is reduced each image is reduced each time the file is saved.time the file is saved.

Embedded vs linked graphicsEmbedded vs linked graphics

An object from a An object from a source file is inserted source file is inserted into a destination file into a destination file which it becomes part which it becomes part of. The graphic then of. The graphic then becomes part of the becomes part of the file, wherever the file file, wherever the file is moved the graphic is moved the graphic is always there. is always there. Automatic updating of Automatic updating of the graphic occurs. the graphic occurs.

Images can just be Images can just be connected to a file. connected to a file. They are linked They are linked together but operate together but operate independently. independently.

Lossless data compression and Lossless data compression and JPEG JPEG

It is a class of data compression, so It is a class of data compression, so original data can be stored in a reduced original data can be stored in a reduced format and still be accessed identically. format and still be accessed identically.

Examples include ZIP and PNG files Examples include ZIP and PNG files Joint Expert Photo Group (JPEG) is used Joint Expert Photo Group (JPEG) is used

to store photographs. to store photographs.

FlickrFlickr

Flickr is a photo sharing website where Flickr is a photo sharing website where you can access a huge amount of photos. you can access a huge amount of photos.

It is easy to be able to store and share It is easy to be able to store and share photos with other people, without using up photos with other people, without using up your own file space. your own file space.

Jane, Aimee and HannahJane, Aimee and Hannah