CS Chap #1 (Sub-topic 1.2: Multimedia)

Question 1

Bit-Map image

Answer 1

system that uses pixels to make up an image

Question 2

Pixel

Answer 2

the smallest element in an electronic image

Question 3

Colour Depth

Answer 3

number of bits used to represent the colours in a pixel

Question 4

Bit Depth

Answer 4

The number of bits used to encode each sample during digitization.

Question 5

Image Resolution

Answer 5

The number of pixels in an image

Question 6

Screen Resolution

Answer 6

The number of horizontal and vertical pixels that make up an image.

Question 7

Pixel Density

Answer 7

number of pixels per unit area

Question 8

Vector Graphics

Answer 8

Vector Graphics

Question 9

Sampling Resolution

Answer 9

number of bits used to represent sound amplitude

Question 10

Sampling rate

Answer 10

Number of sound samples taken per second

Question 11

Frame rate

Answer 11

Number of video frames taken per second

Question 12

How to find pixel density

Answer 12

1. Add squares of resolution size.
2. Find square root.
3. Divide by screen size.

Question 13

Bit-map image File Header

Answer 13

File type
File size
Image resolution
Bit Depth

Question 14

Vector Graphics File Header

Answer 14

Command for each object made in image
Properties of each object
Positions (and relative positions to other objects)

Question 15

Difference between Vector Graphic image and Bit-map image

Answer 15

1. Made of Geometric shapes (with attributes) ———
   Made up of pixels (different colors)
2. To edit we need to change each shape ———
   To edit we can alter each pixel to change design
3. Small file size (b/c made of geometric shapes) ———
   Large file size (b/c made of many pixels)
4. Not usually realistic (b/c made of geometric shapes) ———
   Very realistic (b/c made of many pixels)
5. File format:
   .svg, .cgm, .odg ———
   .jpeg, .bmp, .png

Question 16

How sampling is used to record sound?

Answer 16

1. Sampling rate taken
2. Approximate representation of sound wave created.
3. Sound wave encoded into series of binary digits.

Question 17

Pros and Cons of Higher Sampling Rate

Answer 17

1. Larger dynamic range ——— Larger file size
2. Better sound quality ——— Takes longer to download
3. less Sound distortion ——— Requires greater processing power

Question 18

How can you edit sound?

Answer 18

1. Duration (Stat/Stop time)
2. Extract parts of sound
3. Alter frequency and/or amplitude
   4.Fade in and out
4. Mix and merge multiple sounds
5. Remove ‘noise’
6. convert b/w different audio formats.