Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

Intro to Multimedia > Week 1 - Perception & Images > Flashcards

Week 1 - Perception & Images Flashcards

(40 cards)

Start Studying
1
Q

What is Multimedia?

A

• Using more than one medium of expression, communication.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

An interactive computer-mediated presentation that includes at least two of the following:

A
  • Text
  • Sound
  • Still graphic images
  • Motion graphics
  • Animation
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What two functions do multimedia computers serve?

A
  • Development tools for the creation of multimedia productions e.g. Adobe, Apple, Microsoft, Unity.
  • Delivery devices for multimedia applications
  • Browsers or player applications.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is Perception?

A

The consciousness or awareness of objects or other data

through the medium of the senses.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is the Electromagnetic Spectrum?

A

• Wide range of

waveforms known as the electromagnetic spectrum.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is the speed of light?

A
  • Electromagnetic waves travel at the speed of light
  • c = 299,792,458 m/s
  • c = fλ
  • 299,792,458 m/s / 1,800,000,000Hz = 0.17m
  • 0.17m is the wavelength (λ) of what?
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What 3 things is the power of light measured by?

A
  • Radiance (watts)
  • Luminance (lumens)
  • Brightness
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is Radiance (watts)?

A

• Total amount of energy emitted

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is Luminance (lumens)?

A

• Light strength that is perceived by

the human eye

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is Brightness?

A

• Subjective measure of how bright an object

appears to be

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q 
State the order of the electromagnetic spectrum highest energy to lowest energy.
• G
• X
• U
• V
• I
• M
• U
• R
A
  • Gamma rays
  • X-rays
  • Ultra-violet
  • Visible
  • Infra-red
  • Micro-waves
  • UHF/VHF/TV
  • Radio waves
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Which electromagnetic element has the highest energy but shortest wavelength?

A

• Gamma rays

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Which electromagnetic element has the lowest energy but longest wavelength?

A

• Radio waves

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is the wavelength of visible light between?

A

• 400-700 nanometers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

State the 2 light-receptor cells in the retina?

A
  • Rods

* Cones

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What are rods in the retina?

A
  • Detect shades of black & white.
  • In the peripheral vision.
  • Work in low light - night vision.
  • Approx 120 million of them.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Describe cones in the retina?

Study These Flashcards
A
  • Sensitive to colour.
  • Mainly central.
  • Only work in bright light.
  • Only sensitive to RGB.
  • Approx 6-7 million
18
Q

Humans are tri -_________ & respond to light in bands of RGB.

Study These Flashcards
A

• Tri-chromatic

19
Q

What are active sources of colour?

Study These Flashcards
A

• Emitting different wavelengths of light

e.g. from monitors/projectors.

20
Q

What are passive sources of colour?

Study These Flashcards
A

• Absorbing some wavelengths & reflecting others.

e.g. from printed documents

21
Q

What are the primary colours of active displays?

Study These Flashcards
A
  • Red
  • Green
  • Blue
22
Q

What are the primary colours of passive displays?

Study These Flashcards
A
  • Cyan
  • Magenta
  • Yellow
23
Q

On a white background which colours of RGB are absorbed?

Study These Flashcards
A

• None of the colours

24
Q

On a cyan background which colours of RGB are absorbed?

25
On a Magenta background which colours of RGB are absorbed?
• Green
26
On a Yellow background which colours of RGB are absorbed?
• Blue
27
What is the intensity of each RGB colour to the eye?
• Red - 0.299 • Green - 0.587 • Blue - 0.114 =1
28
What is the Colour Gamut?
``` • Specifies the ranges of colours that can be produced by a particular display • Film Gamut • Monitor Gamut • Printer Gamut ```
29
What 3 things do human eyes respond to more than just dominant wavelength?
* Luminance or brightness * Excitation purity or saturation * The chromaticity or hue of light
30
State the 3 psychophysical models?
* Hue - pure dominant colour * Lightness * Saturation - how much the colour is diluted by white light
31
What is the HSV colour model?
• Mainly refers to the saturation and dominance of hue in the colour.
32
Describe digital images?
* Composed of pixels | * Picture resolution is no. of pixels used to make up image.
33
Another word for digital images?
• Bitmap images
34
Describe resolution?
* Amount of detail | * Storage requirements
35
What is the approx resolution compact cameras take?
• 10-24 megapixels
36
Describe aspect ratio?
• no. of horizontal pixels x vertical pixels
37
How are images stored?
* Pixels in images are assigned numerical values to store colour information. * 0 or 1
38
Colour values range from?
• 0-255
39
Describe true colour?
* High quality | * Requires more memory
40
Describe palette colour?
* Limited numbers of colors | * Enables easier implementation of certain techniques

Intro to Multimedia (11 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions