lecture 3: imagesintro to it cosc1078 introduction to information technology lecture 3 images james...
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Lecture 3: Images Intro to IT
COSC1078 Introduction to Information Technology
Lecture 3
ImagesJames Harland
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: [email protected]• 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!