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  1. 1. Portfolio Task 5 Imaging Presentions by Luke Kersey
  2. 2. DefinitionsDigital Imaging: Images that can be stored on a computer or digital device.Raster Images: A dot matrix data structure representing a generally rectangular grid of pixelsVector Images: A vector image is a computer image that uses a Wire Frame or Outlines to define a shapes area.
  3. 3. Raster ImagesA raster image is a collection of dots called pixels.Each pixel is a tiny square with assigned color value.They are created using a grid of pixels to define the image.When you attempt to increase the size of an image created in a raster based program, the pixels defining the image can be increased in either number or size.Increasing the number of pixels or making the pixels bigger in an image results in the original data being spread over a larger area.Spreading the pixels over a larger area causes the image to begin to lose detail and clarity. When an image is scanned, the image is converted to a collection of pixels called a raster image.Scanned graphics and web graphics are the most common forms of raster images.
  4. 4. Vector ImagesThe word “vector” is a synonym for line.They are composed of mathematically-defined geometric shapes—lines, objects and fills.When creating a vector image in a vector illustration program, node or drawing points are inserted and lines and curves connect notes together. This is the same principle as “connect the dots”.Each node, line and curve is defined in the drawing by the graphics software by a mathematical description.They usually are easily modified within the creating application and generally are not affected detrimentally by scaling (enlarging or reducing their size).If the image is increased in size, the equation is recalculated accordingly resulting in the image increasing in size with no loss of data or detail.A vector object will have a “wireframe” underneath the colors in the object. In a vector object, colors are like clothes over the top of a skeleton.They’re defined as solid objects, and can be moved around in full, or grouped together with other objects.
  5. 5. Advantages/Disadvantages ADVANTAGES DISADVANTAGESRASTER • Best for photographs • Can not keep quality and complex images while resizingVECTOR • Can be easily scaled • Cannot be used to and manipulated store complex images without quality loss like photos • Easy to render • High resolution • Vector files are useful screens are needed for storing images to show the pictures composed of line at the best quality based elements
  6. 6. Image File FormatsImage file formats are standardized means of organizing and storing digital images.Some examples are:.bmp.gif.jpg.tiff.png
  7. 7. JPEG, GIF and TIFF ADVANTAGES DISADVANTAGES USED FORJPEG Works very well for Compression Used for high photographs. drastically reduces quality photographic image quality. images.GIF Good for websites Limited colour Animations and and can be depth. images with large animated areas of solid colourTIFF Very high quality No good for internet Big banners and use because of posters such as real large filesizes estate signs
  8. 8. References eg_compression.html vector-vs-raster/