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Unit 78 Technical File

     By Chris Munro
Pixel and Resolution
 Pixel Resolution is the pixel count in any
    digital image. Pixel Resolution is described
    with 2 sets of numbers the first number is
    the pixel columns and the second is the
    pixel rows (7680 by 4320)
Vector and Raster images
 There are two types of graphic vector and
    raster when it comes to computer graphics.
 Raster images are called Bitmap Images
 Bitmap images use a grid of individual pixels
    and each pixel can be a different colour.
 Vector images use mathematic relationship
    between points and the paths.
File formats and uses
   JPG  Used for websites and emails as the file can be compressed making a small file size. But the smaller
        the file size the lower the quality, the bigger the file size the higher the quality.
Compression
 There are two types of image compression
    Lossless and Lossy
 Lossless can compress the file to an exact
    duplicate of the original but the
    compression ratio is not high at all
 Lossy gives you a higher compression ratio as
    its strips the file of some of it redundant
    data

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Unit 78 technical file

  • 1. Unit 78 Technical File By Chris Munro
  • 2. Pixel and Resolution Pixel Resolution is the pixel count in any digital image. Pixel Resolution is described with 2 sets of numbers the first number is the pixel columns and the second is the pixel rows (7680 by 4320)
  • 3. Vector and Raster images There are two types of graphic vector and raster when it comes to computer graphics. Raster images are called Bitmap Images Bitmap images use a grid of individual pixels and each pixel can be a different colour. Vector images use mathematic relationship between points and the paths.
  • 4. File formats and uses JPG Used for websites and emails as the file can be compressed making a small file size. But the smaller the file size the lower the quality, the bigger the file size the higher the quality.
  • 5. Compression There are two types of image compression Lossless and Lossy Lossless can compress the file to an exact duplicate of the original but the compression ratio is not high at all Lossy gives you a higher compression ratio as its strips the file of some of it redundant data