Week 6 Task   File Formats
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Week 6 Task File Formats






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    Week 6 Task   File Formats Week 6 Task File Formats Presentation Transcript

    • Week 6 Task - File Formats Philippa Rush, Jenni Chevalier, Sarah Coates
    • Differences between vector based images and bitmap based images;
      • “ A vector based image uses geometrical formulas to represent images whereas Bitmaps (often known as raster graphics) are made up from a pattern of dots.”
      • Differences include…
      • “ Programs that allow you to create and manipulate vector grpahics are called draw programmes and programs that manipulate bit-map images are called paint programs. ”
      • Vector graphics can be resized very easily in comparison to bitmaps.
      • Vector images are stored in a much finer detail and therefore look better when displayed on a high resolution printer than bitmaps.
      • Bitmaps will always look the same, regardless of printer quality.
      • The majority of ‘output’ devices are raster devices as a result, all images must be ‘translated’ before printing.
      • http://www.colourgen.com/printer_information/vector_bitmap_differences.php
    • Differences between GIF formatted file and JPEG;
      • “ GIF: Graphics Interchange Format”
      • Can only contain up to 256 colours
      • Optimised for contrast images and block colour, not recommended for photo’s or high definition detailed photos or imaging because photo may be notably degraded
      • Suitable for webpage imaging
      • “ JPEG: The Joint Photo Expert Group image format”
      • Is usually used for photo-realistic image type, drawings and highly coloured/detailed work
      • Often compressed due to large file size, the higher the compression, the poorer the image quality.
      • Uses knowledge of human eye quality  small loss in colour isn’t very noticeable to our sight.
      • Due to information loss after each saving, it is suggested that an image is only saved once to avoid severe degradation
      • Suitable for webpage imaging
    • Difference between and embedded graphic and a linked graphic
      • A link graphic is stored in the source file meaning that only a representation is viewed in the document
      • An embedded graphic on the other hand is a part of the document and no longer belongs to the source file. This is the default setting.
    • What is a 'colour palette'?
      • A palette “is a designated subset of the total range of colors supported by a computer graphics system. Each color in the palette is assigned a number, and for each pixel, one of these numbers is stored. This number determines the color of the pixel”
      • http://en.wikipedia.org/wiki/Colour_palette
      • An example of a file with a small colour palette could be a word document using black font. On the other hand, an image file would have a large colour palette.
    • What is lossless compression?
      • Lossless data compression is a class of data compression algorithms that allows the exact original data to be reconstructed from the compressed data. It is used when it is important that the original and decompressed data are to be identical. JPEG files do not usually use lossless data compression but instead use lossy data compression where some visual quality is lost in the process
    • What does the FBS skills wiki say about using PNG files?
      • PNG: Portable Network Graphics format. This is a rather new invention, designed to overcome some of the problems described in question 2. GIF files are known for poor photo imaging and simplifying images that contain more than 256 colours.
      • PNG, on the other hand, provides a much higher colour support and a slightly better compression quality. This is used fully across the worldwide web, but things are always developinh.
    • What is BAD about using .bmp format files in your work?
      • they are not supported by any web browsers therefore they are not a suitable format for images in a web application
    • What is Flickr?
      • Flickr is a photo sharing website, mainly used by bloggers. The purpose of Flickr is to “get photos into and out of the system in as many ways as we can get photos from the web, from mobile devices, from the users' home computers.” It also allows innovative ways to organise photos. Although Flickr is mainly for recreational purposes, photos can be downloaded from the site and may be used in presentations.