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Image and Graphic Files   Laura Greensmith  Sophie Harper  Lauren Staddon  Katie Mossop
Vector and Bitmap Based Images  <ul><li>Vector  graphics are not based on pixel patterns, but instead use mathematical for...
Differences and purposes of GIF and JPEG formatted files <ul><li>JPG  images are better at holding more colour information...
Embedded graphic (image) and Linked graphic (image) <ul><li>Embedded articles are placed in and saved with a file and rema...
What is a 'colour pallette'?  <ul><li>Images can enhance any presentation so long as they are effective and striking. </li...
What is lossless compression?  <ul><li>Lossless data compression  is a class of  data compression   algorithms  that allow...
What does the FBS skills wiki say about using PNG files?  <ul><li>Another file format, the &quot;PNG&quot; or &quot; P ort...
What is BAD about using .bmp format files in your work?  <ul><li>Bitmap graphics do not scale very well. If we decide to m...
What is Flickr?  <ul><li>Photo sharing website </li></ul><ul><li>Useful for collecting together images for a common purpos...
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Graphic File Formats

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Transcript of "Graphic File Formats"

  1. 1. Image and Graphic Files Laura Greensmith Sophie Harper Lauren Staddon Katie Mossop
  2. 2. Vector and Bitmap Based Images <ul><li>Vector graphics are not based on pixel patterns, but instead use mathematical formulas consisting of lines and curves that make shapes. With the exception of Flash most browsers do not support vector graphics on the web </li></ul><ul><li>Bitmap (or raster) graphics are stored as a series of tiny dots called pixels. Each pixel is assigned a color, and when they are viewed together, they form a picture. </li></ul><ul><li>http://www.allgraphicdesign.com/graphics/graphicsclipartanimations/clipartgraphics/fileformats/bitmaprasterimages/graphicsfileformats.html </li></ul>
  3. 3. Differences and purposes of GIF and JPEG formatted files <ul><li>JPG images are better at holding more colour information, such as photographs. They use a 'lossey' form of compression to make sure the file size isn’t too big - some of the picture information is 'thrown away‘. </li></ul><ul><li>GIFs are better at saving images with sharp lines as they don't throw away any information. For example text, logos, lines and images that have been created on a computer. They can't hold information about more than 256 different colours. </li></ul><ul><li>http://www.bbc.co.uk/webwise/askbruce/articles/scancam/gifjpg_1.shtml </li></ul>
  4. 4. Embedded graphic (image) and Linked graphic (image) <ul><li>Embedded articles are placed in and saved with a file and remain constant. </li></ul><ul><li>Linked articles are placed in a file with a reference to the source file, but are linked to the source file and when you update the one, you may update the other. </li></ul><ul><li>http://people.uncw.edu/mferner/CSC105/IntegrateOffice.ppt </li></ul>
  5. 5. What is a 'colour pallette'? <ul><li>Images can enhance any presentation so long as they are effective and striking. </li></ul><ul><li>Colour palettes allow you to pinpoint and enhance the foreground and background colour of palette images. </li></ul><ul><li>Palette images have a colour range between 2 and 256 and are dependant on the ‘materials’ within the image. </li></ul><ul><li>For example a small palette image would be from clipart, whereas a photo would be an example of a large palette image. </li></ul><ul><li>Corel paint shop pro photo help </li></ul>
  6. 6. What is lossless compression? <ul><li>Lossless data compression is a class of data compression algorithms that allows the exact original data to be reconstructed from the compressed data. </li></ul><ul><li>Can be used in JPEG files but creates large file size </li></ul><ul><li>http://en.wikipedia.org/wiki/Lossless_data_compression </li></ul>
  7. 7. What does the FBS skills wiki say about using PNG files? <ul><li>Another file format, the &quot;PNG&quot; or &quot; P ortable N etwork G raphics&quot; file, overcomes many of the problems with GIF and JPG files but it does not support animations. </li></ul><ul><li>https://wiki.leeds.ac.uk/index.php/FBS_Faculty_Skills_Guide_-_Computers </li></ul>
  8. 8. What is BAD about using .bmp format files in your work? <ul><li>Bitmap graphics do not scale very well. If we decide to make the image larger or smaller, then the program has to try and recalculate what colour the pixels should now be. </li></ul><ul><li>If we try and enlarge bitmap images too much, we will also run into the problem of aliasing, this is the staircase effect, that usually shows up in diagonal lines, or where two different colours sit side by side. The image will also start to look blurred. </li></ul><ul><li>http://www.aifweb.com/2d_graphics/bmap_graphics.html </li></ul>
  9. 9. What is Flickr? <ul><li>Photo sharing website </li></ul><ul><li>Useful for collecting together images for a common purpose that can be accessed by everyone. Images can also be tagged for the location they were taken to enhance their impact and usefulness. </li></ul><ul><li>This website could be useful in an academic setting since results from studies can be posted and shared. </li></ul><ul><li>www.flikr.com/tour </li></ul>
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