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Week 6 Task File Formats


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Week 6 Task File Formats

  1. 1. Week 6 Task File Formats Student
  2. 2. Introduction <ul><li>A number of different file formats can be used in order to share files between different files and therefore different documents. </li></ul>
  3. 3. Topics of Discussion <ul><li>Different types of files, and their relevance in different subject areas… </li></ul>
  4. 4. What is the difference between a vector based image and a bitmap based image? <ul><li>Bitmap is made up of pixels in a grid and are resolution-dependent. </li></ul><ul><li>This means that quality can be changed as size is changed </li></ul><ul><li>Vector-based images are made up of scaleable objects </li></ul><ul><li>Defined by mathematical equations, therefore always have high quality. </li></ul>
  5. 5. What is the difference between a GIF and a JPEG formatted image file? <ul><li>JPEG is used for many colours </li></ul><ul><li>GIF uses fewer pixels </li></ul>
  6. 6. What is the difference between an embedded graphic image and a linked-graphic image in a word or powerpoint document? <ul><li>Embedded graphics are used when working on an imported file independently, whereas link graphic images remain independent of the illustrator file. </li></ul><ul><li>Embedded images are important as the file size does not matter and can be constantly moved between different files. </li></ul>
  7. 7. What is a colour palette? <ul><li>A colour palette is a set of colours defined to use on an image. </li></ul><ul><li>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 </li></ul><ul><li>Large palette files: TIF and JPEG files store a 24 bit index for each of the millions of image pixels </li></ul>
  8. 8. What is lossless compression? Do JPEG files normally use this? Why is it important? <ul><li>Lossless compression is the reduction of file size with no reduction in image quality. </li></ul><ul><li>JPEG files do not normally use this </li></ul><ul><li>It is important to reduce the artefacts in the image. </li></ul>
  9. 9. What does the FBS skills wiki say about using PNG files? <ul><li>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”. </li></ul>
  10. 10. What is bad about using .BMP files in your work (bitmap) <ul><li>Too big </li></ul><ul><li>Thus bad for sending/saving </li></ul>
  11. 11. What is Flickr? Why might someone use this resource? Does it have an academic use or is it purely recreational? <ul><li>It is a photo sharing website </li></ul><ul><li>Mainly used by bloggers </li></ul><ul><li>No, does not have an academic use </li></ul>