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Tech Technicalities I

Tech Technicalities I. Mills SOC128 Fall 2013 Dan Ryan. Contents. Types of Image Files Clients, Servers, Browsers, Applications Vector/Raster Bar codes, QR Codes. “Know the Difference”. Image file types. Consider this 30x30 pixel image.

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Tech Technicalities I

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  1. Tech Technicalities I Mills SOC128 Fall 2013 Dan Ryan

  2. Contents • Types of Image Files • Clients, Servers, Browsers, Applications • Vector/Raster • Bar codes, QR Codes

  3. “Know the Difference” Image file types

  4. Consider this 30x30 pixel image 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 0 0 0 0 0 0 0 1 2 0 18, 0, 5, 1, 7, 0 3 4 6 5 7 9 8 10 10 13 12 14

  5. PNG (1996) • 24 bit RGB color space or grey scale. Not for graphics so does not do CYMK (cyan, yellow, magenta, black) • GIF – “graphics interchange format” (1987) • Up to 8 bits per pixel (only 256 colors), animation, LZW loss-less compression • Patent controversies gave way to PNG • JPG, JPEG (1992) “joint photographic experts group” • ~10:1 compression format lossy – each time it’s compressed some information is lost. • TIFF (1980s) tagged image file format 3rd byte 42 • Largest files, used in high def graphic design environments • PDF (1991) – “portable document format” • Adobe. Cross-platform/application document not image per se. Vector and raster

  6. Comparing Formats http://andreas.com/faq-gif-png.html

  7. “Know the Difference” Clients, servers, and apps

  8. Servers and Clients • Multiple meanings, but • …boils down to… • A division of labor in which… • …a single server entity provides some service for multiple distributed client entities • May refer to hardware or software

  9. Clients and Servers http://www.wildbunny.co.uk/blog/wp-content/uploads/2012/10/clientServer.gif

  10. Clients and Servers in Conservation http://www.differencebetween.info/sites/default/files/images/2/client-server-illustration.gif

  11. Clients and Servers Instructions/Request/Data Server Software Data/Map/Image ClientSoftware Server Machine Client Machine

  12. Clients and The Cloud Instructions/Request/Data Data/Map/Image ClientSoftware Client Machine

  13. “Know the Difference” Raster and vector

  14. What does “raster” mean? • How (analog) TVs used to work • Device consists of electron beam gun, screen, magnets and circuitry. • Circuitry translates input signal into instructions for beam gun and magnets • Beam turns on and off and is bent by magnets so it sweeps across and down the screen. Turn beam on/off Magnets deflect beam what we see That is a “raster pattern” Signal In TV Circuitry

  15. Digital Raster Image • Same, except screen defined in terms of a grid of “pixels”

  16. Digital Vector Image • Specify coordinates of vertices • How to draw object

  17. Vector and Raster http://multimedia.journalism.berkeley.edu/tutorials/introduction-to-flash/drawing-in-flash/

  18. Vector and Raster http://signsofseattle.com/blog/

  19. Vector and Raster https://www.e-education.psu.edu/natureofgeoinfo/book/export/html/1604

  20. Vector and Raster http://library.oceanteacher.org/OTMediawiki/index.php/Geographic_Information_System_Data_Models

  21. Vector and Raster http://www.gis.unbc.ca/courses/geog205/lectures/datasource/

  22. “What is a…” QR Code

  23. QRCodes • Quick Response Code (Toyota 1994) • Matrix Bar Code. Encodes 100s of characters. • License free • Generators online

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