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Computer Science > 1.2 - Text, Sound & Images > Flashcards

1.2 - Text, Sound & Images Flashcards

1
Q

What is a bitmap image? [2]

A

an image using bits and pixels

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2
Q

What is a pixel? [2]

A
  • small elements of colour that make up a bitmap image
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3
Q

What is colour depth? [2]

A

number of bits in a bitmap image

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4
Q

What is screen resolution? [2]

A

how good the resolution of the screen is

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5
Q

What is image resolution? [2]

A

number of pixels in the X-Y direction of an image

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6
Q

What happens if you increase the colour depth in terms of file size? [1]

A

file size also increases

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7
Q

What is the formula for sample rate? [2]

A

RATE = FILE SIZE / SAMPLE RESOLUTION x LENGTH

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8
Q

What is the formula for sample resolution? [2]

A

RESOLUTION = FILE SIZE / LENGTH x SAMPLE RATE

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9
Q

What is the formula for file size? [2]

A

SAMPLE RATE x SAMPLE RESOLUTION x LENGTH

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10
Q

What is the formula for length? [2]

A

FILE SIZE / SAMPLE RESOLUTION x SAMPLE RATE

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11
Q

What unit should you always convert sample rate into? [1]

A

Hertz (Hz)

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12
Q

What unit should you always convert sample resolution into? [1]

A

Bits

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13
Q

What unit should you always convert time into? [1]

A

Seconds

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14
Q

What is the formula for resolution with colour depth involved? [2]

A

resolution = file size / colour depth

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15
Q

What is the formula for file size with colour depth involved? [2]

A

resolution x colour depth

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16
Q

What is the formula for colour depth? [2]

A

file size / resolution

17
Q

How do you convert from bits to byte in binary? [1]

A

divide by 8

18
Q

How do you convert from byte to bits in binary? [1]

A

multiply by 8

19
Q

How do you get from Byte to Kib, Kib to Mib, MiB to Gib, Gib to Tib? [4]

A

divide by 1024 EACH TIME

20
Q

What is 1024 in indice shortcut? [1]

A

2^10

21
Q

How do you get from Tib to Gib, Gib to Mib, MiB to Kib, Kib to Byte? [4]

A

multiply by 1024 EACH TIME

22
Q

How do you convert from bits to byte in denary? [1]

A

divide by 8

23
Q

How do you convert from byte to bits in denary? [1]

A

multiply by 8

24
Q

How do you get from Byte to KB, KB to MB, MB to GB, GB to TB? [4]

A

divide by 1000 EACH TIME

25
Q

What is 1000 in indice shortcut? [1]

A

10^3

26
Q

How do you get from TB to GB, GB to MB, MB to KB, KB to Byte? [4]

A

multiply by 1000 EACH TIME

27
Q

What is sampling resolution? [2]

A

number of bits used to represent sound amplitude

28
Q

What is sampling rate? [2]

A

number of sound samples taken per second

Computer Science (18 decks)

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