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COSC1078 Introduction to Information Technology Lecture 3 Images

James Harland james.harland@rmit.edu.au. COSC1078 Introduction to Information Technology Lecture 3 Images. Overview. Questions? Images Assignment 1 Lab classes Questions?. Introduction to IT. 1 Introduction 2 Images 3 Audio 4 Video WebLearnTest 1

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COSC1078 Introduction to Information Technology Lecture 3 Images

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  1. Intro to IT James Harland james.harland@rmit.edu.au COSC1078 Introduction to Information TechnologyLecture 3Images

  2. Intro to IT Overview • Questions? • Images • Assignment 1 • Lab classes • Questions?

  3. Intro to IT Introduction to IT 1 Introduction 2 Images 3Audio 4Video WebLearnTest 1 5 Binary Representation Assignment 1 6 Data Storage 7Machine Processing 8 Operating Systems WebLearnTest 1 9 Processes Assignment 2 10 Internet 11Internet Security WebLearnTest 3 12Future of IT Assignment 3, Peer and Self Assessment

  4. Intro to IT Introduction James Harland • Email:james.harland@rmit.edu.au • URL:www.cs.rmit.edu.au/~jah • Phone:9925 2045 • Office:14.10.1 (Building 14, level 10, room 1) • Consultation:Mon 4.30-5.30, Thu 11.30-12.30 What colour is my office door? Carpet? Chair?

  5. Intro to IT Assessment Process • Submit all assignments via Blackboard in the Learning Hub • Assignment 1 due 11.59pm Sunday 1st April • Assignment 2 due 11.59pm Sunday 6th May • Assignment 3 due 11.59pm Sunday 27th May • Late assignments attract a penalty of 10% per day late, up to a maximum of 50%

  6. Intro to IT Assignment • Assignment will be in three parts • Overall task is to produce a video • Groups of up to 3 • Assessed by final video and group blog • Part 1: images and audio (end of week 5) • Part2: hardware (end of week 9) • Part 3: reflection, research (end of week 12)

  7. Intro to IT Assignment 1 • Use GIMP (or a similar tool) to perform some manipulations on an image • Use Audacity to perform some manipulations on sound • Address three issues in relation to this • Lab classes 2 and 3 will be based around GIMP • Lab class 4 based on Audacity • Main emphasis is on process, not result! • Will be released by end of this week

  8. Lab Classes Start in week 2 (this week) Work on practical exercises and sometimes assignment materials Lab assists present to help and an answer questions Details will be in the Learning Hub Lecture 3: Images Intro to IT

  9. Overview 01010100001010101010100110100010101001101001010010100011100010101010100101111001001010… Lecture 3: Images Intro to IT

  10. Overview 01010100001010101010100110100010101001101001010010100011100010101010100101111001001010… Lecture 3: Images Intro to IT

  11. Representing Images Pixel Lecture 3: Images Intro to IT

  12. Representing Images Pixel Lecture 3: Images Intro to IT

  13. Representing Images • Pixel • `picture element’ (sampling) • dot of colour • Resolution • number of pixels • 6 megapixels means 3000 x 2000 • Bit depth • How many colours per pixel (quantizing) • The bigger this value is, the more colours can be displayed Lecture 3: Images Intro to IT

  14. Representing Images • These are known as bitmapped images • (or raster graphics) • Can be edited pixel by pixel • Appearance can look bad when sizes are changed • Low resolution versions generally look horrible! • Jpeg, gif, bmp, png, tif,… Lecture 3: Images Intro to IT

  15. Representing Images • Vector graphics use equations to represent images • generally saves space • resolution independent (ie can be rescaled to any size without loss of quality) • can be rasterized (ie converted into bitmapped representation) • eps, wmf, … Lecture 3: Images Intro to IT

  16. Representing Colours 01010100001010101010100110100010101001101001010010100011100010101010100101111001001010… R Pixel G B Lecture 3: Images Intro to IT

  17. Representing Colours • There are various different schemes for representing colours • RGB • CMYK • HSB • HSL • CIE XYZ 01010100001… Lecture 3: Images Intro to IT

  18. Intro to IT Conclusion • Go to laboratory classes (and tutorials) this week! • Lab notes in the Learning Hubub • Check details in Course Guide • Start reading (notes, problems, report topic) GET THE BOOK!

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