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 IT

1 Introduction

2 Images

3 Audio

4 Video WebLearnTest 1

5 Binary Representation Assignment 1

6 Data Storage

7 Machine Processing

8 Operating Systems WebLearn Test 1

9 Processes Assignment 2

10 Internet

11 Internet Security   WebLearn Test 3

12 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-

12.30

What 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

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Lecture 3: Images Intro to IT

Overview

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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 Colours

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PixelR

GB

Lecture 3: Images Intro to IT

Representing Colours

There are various different schemes for representing colours

RGB CMYK HSB HSL CIE XYZ

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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!