Tech Technicalities I Mills SOC128 Fall 2013 Dan Ryan.

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Presentation transcript:

Tech Technicalities I Mills SOC128 Fall 2013 Dan Ryan

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

IMAGE FILE TYPES “Know the Difference”

Consider this 30x30 pixel image , 0, 5, 1, 7,

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 3 rd 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

Comparing Formats

CLIENTS, SERVERS, AND APPS “Know the Difference”

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

Clients and Servers

Clients and Servers in Conservation

Clients and Servers Server Software Client Software Client Machine Server Machine

Clients and The Cloud Client Software Client Machine

RASTER AND VECTOR “Know the Difference”

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. TV Circuitry Signal In Turn beam on/off Magnets deflect beam what we see

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

Digital Vector Image Specify coordinates of vertices How to draw object

Vector and Raster

Vector and Raster

Vector and Raster

Vector and Raster

Vector and Raster

QR CODE “What is a…”

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