Week 6 Task File Formats

Week 6 Task File Formats Student

Introduction
A number of different file formats can be used in order to share files between different files and therefore different documents.

Topics of Discussion
Different types of files, and their relevance in different subject areas…

What is the difference between a vector based image and a bitmap based image?
Bitmap is made up of pixels in a grid and are resolution-dependent.
This means that quality can be changed as size is changed
Vector-based images are made up of scaleable objects
Defined by mathematical equations, therefore always have high quality.

What is the difference between a GIF and a JPEG formatted image file?
JPEG is used for many colours
GIF uses fewer pixels

What is the difference between an embedded graphic image and a linked-graphic image in a word or powerpoint document?
Embedded graphics are used when working on an imported file independently, whereas link graphic images remain independent of the illustrator file.
Embedded images are important as the file size does not matter and can be constantly moved between different files.

What is a colour palette?
A colour palette is a set of colours defined to use on an image.
Small palette files: GIF files store a 4 or 8 bit index for each pixel. The image is a lot smaller than that of 24 bits
Large palette files: TIF and JPEG files store a 24 bit index for each of the millions of image pixels

What is lossless compression? Do JPEG files normally use this? Why is it important?
Lossless compression is the reduction of file size with no reduction in image quality.
JPEG files do not normally use this
It is important to reduce the artefacts in the image.

What does the FBS skills wiki say about using PNG files?
The FBS skills wiki states that “PNG files overcome many of the problems associated with GIF and JPEG files, but it does not support animations”.

What is bad about using .BMP files in your work (bitmap)
Too big
Thus bad for sending/saving

What is Flickr? Why might someone use this resource? Does it have an academic use or is it purely recreational?
It is a photo sharing website
Mainly used by bloggers
No, does not have an academic use

Week 6 Task File Formats

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