Graphics And Image Files[1]

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Graphics And Image Files[1]

  1. 1. Graphics and Image Files <ul><li>Vlad Botchkarev </li></ul><ul><li>Saadat Ahmed </li></ul><ul><li>Emma Boothman </li></ul><ul><li>Dave Hughes </li></ul>
  2. 2. Vectors and Bitmap (Raster) Images <ul><li>Vector images </li></ul><ul><li>Are defined mathematically by the computer </li></ul><ul><li>Can be modified </li></ul><ul><li>Easily scalable </li></ul><ul><li>Less memory required </li></ul><ul><li>Bitmap images </li></ul><ul><li>Rectangular grid of pixels with each pixel holding a specific colour value </li></ul><ul><li>Suitable for photos </li></ul>
  3. 3. GIF and JPEG Images <ul><li>GIF </li></ul><ul><li>Suited for simple images such as graphics or logos </li></ul><ul><li>JPEG </li></ul><ul><li>Suited for photos and images with smooth variation of tone and colour </li></ul><ul><li>Relatively small file size </li></ul><ul><li>Quality decreases when repeatedly edited and saved </li></ul>
  4. 4. Embedded and Linked Graphics <ul><li>Embedded files </li></ul><ul><ul><li>Permanently linked to document </li></ul></ul><ul><ul><li>Independent of original source </li></ul></ul><ul><ul><li>Stored as part of the file and not externally </li></ul></ul><ul><li>Linked files </li></ul><ul><ul><li>Dependent on original source </li></ul></ul><ul><ul><li>Change if source document changes (e.g. Microsoft Excel spreadsheet) </li></ul></ul><ul><ul><li>Not stored as part of document; need to be present with document </li></ul></ul><ul><li>Default action after copy-paste is embedded . </li></ul><ul><ul><li>Source: Microsoft Office Online Help </li></ul></ul>http://previews0.coolclips.com/01/tf05038/NVTech_busi0407.jpg
  5. 5. What is a Colour Palette? <ul><li>Collection of colours used by the image </li></ul><ul><li>Different colour ranges for different uses </li></ul><ul><li>Personal photography, advanced editing </li></ul><ul><ul><li>High-resolution, 24 bit (16 million colours) </li></ul></ul><ul><ul><ul><li>Uses large palette </li></ul></ul></ul><ul><li>Web-based imaging </li></ul><ul><ul><li>Lower-resolution, 8 bit (156 colours) </li></ul></ul><ul><ul><ul><li>Small palette </li></ul></ul></ul><ul><ul><ul><ul><li>Not all computer monitors designed with advanced colour range </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Faster loading speeds via slow connections </li></ul></ul></ul></ul>http://www1.istockphoto.com/file_thumbview_approv e/720581/2/istockphoto_720581_painter_s_palette.jpg Source: PaintshopPro Help
  6. 6. What is Lossless Compression? Do JPEG files normally use this? <ul><li>Lossless compression is the compression of a file without a loss of quality </li></ul><ul><li>Jpeg files do not use lossless compression </li></ul><ul><li>The image is an exact copy whilst taking up less disk space </li></ul>Taken from: http:// en.wikipedia.org/wiki/Lossless_compression
  7. 7. What the FBS skills wiki says about png files <ul><li>Png – portable network graphics </li></ul><ul><li>It is a bitmapped image format that employs lossless compression </li></ul><ul><li>It was created to improve on gif format, and overcomes many problems that are associated with gif and jpg files </li></ul><ul><li>It does not, however, support animations </li></ul>Taken from: FBS skills wiki
  8. 8. Why .bmp format images are bad and why should you avoid using them? <ul><li>.bmp images cannot be compressed, therefore will have a large file size. </li></ul><ul><li>They are not capable of storing animation. </li></ul><ul><li>They are not supported by web browsers. </li></ul>Taken from: http://support.microsoft.com/kb/320314 and http://www.fortunecity.com/skyscraper/windows/364/bmpffrmt.html
  9. 9. What is Flickr? <ul><li>It is a worldwide photo sharing website. </li></ul><ul><li>Used for communal purposes and used by bloggers. </li></ul><ul><li>Can also be used in group work to allow easy access for all members of a group to access the same material to use it in one shared document. </li></ul>Taken from: http:// en.wikipedia.org/wiki/Flickr

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