Lecture 3: Images Intro to IT

COSC1078 Introduction to Information Technology

Lecture 3

ImagesJames Harland

james.harland@rmit.edu.au

Lecture 3: Images Intro to IT

Overview Questions?

Images

Assignment 1

Lab classes

Questions?

Lecture 3: Images Intro to IT

Introduction to IT1 Introduction 2 Images3 Audio4 Video WebLearnTest 1 5 Binary Representation Assignment 16 Data Storage7 Machine Processing8 Operating Systems WebLearn Test 19 Processes Assignment 210 Internet11 Internet Security   WebLearn Test 312 Future of IT Assignment 3, Peer and Self Assessment

Lecture 3: Images 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-

12.30What colour is my office

door? Carpet? Chair?

Lecture 2: Overview 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%

Lecture 2: Overview 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)

Lecture 3: Images 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

Lecture 3: Images Intro to IT

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

Overview 01010100001010101010100110100010101001101001010010100011100010101010100101111001001010…

Lecture 3: Images Intro to IT

Overview 01010100001010101010100110100010101001101001010010100011100010101010100101111001001010…

Lecture 3: Images Intro to IT

Representing Images

Pixel

Lecture 3: Images Intro to IT

Representing Images

Pixel

Lecture 3: Images Intro to IT

Representing Images

Pixel `picture element’ (sampling) dot of colourResolution number of pixels 6 megapixels means 3000 x 2000Bit depth How many colours per pixel (quantizing) The bigger this value is, the more colours can be displayed

Lecture 3: Images Intro to IT

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

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

Representing Colours01010100001010101010100110100010101001101001010010100011100010101010100101111001001010…

Pixel RGB

Lecture 3: Images Intro to IT

Representing ColoursThere are various different schemes for representing colours

RGB CMYK HSB HSL CIE XYZ

01010100001…

Lecture 3: Images 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!