Unit 78: Task 3 Technical file


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Unit 78: Task 3 Technical file

  1. 1. Task 3- Technical FilePixel And Resolution:In digital imaging, a pixel, or pel,picture element is a physical point in araster image, or the smallest addressableelement in a display device; so it is thesmallest controllable element of a picturerepresented on the screen.The display resolution of a digitaltelevision, computer monitor or displaydevice is the number of distinct pixels ineach dimension that can be displayed.
  2. 2. Vector and Raster images:Vector graphics is the use ofgeometrical primitives such aspoints, lines, curves, and shapes orpolygon(s), which are all based onmathematical expressions, torepresent images in computergraphics. "Vector", in this context,implies more than a straight line.In computer graphics, a rastergraphics image, or bitmap, is a dotmatrix data structure representinga generally rectangular grid ofpixels, or points of colour, viewablevia a monitor, paper, or otherdisplay medium. Raster images arestored in image files with varyingformats
  3. 3. File Formats And uses:A file format is a standard way thatinformation is encoded for storagein a computer file. A file formatspecifies how bits are used toencode information in a digitalstorage medium. File formats maybe either proprietary or free andmay be either unpublished or open.
  4. 4. GIF - Graphics Interchange Format - Images using a fixed colorpalette (limited to only 256 colours - not the full spectrum ofcolors available to your monitor). The GIF format uses compressionfor smaller files and faster downloads. This format is best forimages with solid colors or areas of uniform colour such asillustrations and logos.JPEG - Joint Photographic Experts Group - Used for photographic(continuous tone) images. Unlike GIF files the JPEG format can takeadvantage of the full spectrum of colours available to your monitor.The JPEG format also uses compression for smaller files and fasterdownloads. However, unlike the compression method used in GIFfiles, the JPEG compression is "lossy" which means it discards datain the process. Once a file is saved in JPEG format the data ispermanently lost. If you want all the image data available for futureuse, save the image using no compression or "lossless"compression and make JPEG copies from it.
  5. 5. TIFF - Tagged-Image File Format - Used for bitmaps only. TheTIFF format is supported by virtually all graphics applications.EPS - Encapsulated PostScript® - A file format used for bothvector graphics and bitmaps. EPS files contain a PostScriptdescription of the graphic data within them. EPS files areunique in that you can use them for vector graphics, bitmapimages, type or even entire pages.BMP - The BMP file format (Windows bitmap) handles graphics files within theMicrosoft Windows OS. Typically, BMP files are uncompressed, hence they arelarge; the advantage is their simplicity and wide acceptance in Windowsprograms.PNG - The PNG (Portable Network Graphics) file format was created as thefree, open-source successor to GIF. The PNG file format supports truecolor (16million colours) while GIF supports only 256 colors. The PNG file excels when theimage has large, uniformly colored areas. The lossless PNG format is best suitedfor editing pictures, and the lossy formats, like JPG, are best for the finaldistribution of photographic images, because in this case JPG files are usuallysmaller than PNG files. The Adam7-interlacing allows an early preview, evenwhen only a small percentage of the image data has been transmitted.
  6. 6. PSD- Photoshop files have default file extension as .PSD, which stands for"Photoshop Document." A PSD file stores an image with support for mostimaging options available in Photoshop. These include layers with masks,colour spaces, ICC profiles, CMYK Mode (used for commercial printing),transparency, text, alpha channels and spot colours, clipping paths, andduotone settings. This is in contrast to many other file formats (e.g. .JPG or.GIF) that restrict content to provide streamlined, predictable functionality. APSD file has a maximum height and width of 30,000 pixels, and a length limitof 2 Gigabytes.
  7. 7. Compression:In computer science and information theory, datacompression, source coding, or bit-rate reductioninvolves encoding information using fewer bits than theoriginal representation. Compression can be either belossy or lossless. Lossless compression reduces bits byidentifying and eliminating statistical redundancy. Noinformation is lost in lossless compression. Lossycompression reduces bits by identifying marginallyimportant information and removing it. The process ofreducing the size of a data file is popularly referred to asdata compression, although its formal name is sourcecoding (coding done at the source of the data, before it isstored or transmitted).
  8. 8. Image capture devices:The process of using devices such asdigital cameras or scanners to captureimages in a digital format. The resultingfiles are then further processed to arriveat a final image.Optimising:
  9. 9. Storage and asset Management:Storage Management The administration of any or all ofbackup, archival, disaster recovery and hierarchical storagemanagement (HSM) procedures within an organizationAsset management, broadly defined, refers to any system thatmonitors and maintains things of value to an entity or group. Itmay apply to both tangible assets such as buildings and tointangible concepts such as intellectual property and goodwill.Asset management is a systematic process ofoperating, maintaining, upgrading, and disposing of assetscost-effectively. Alternative views of asset management in theengineering environment are: The practice of managing assetsto achieve the greatest return (particularly useful forproductive assets such as plant and equipment), and theprocess of monitoring and maintaining facilities systems, withthe objective of providing the best possible service to users.