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Computing > Representing Data > Flashcards

Representing Data Flashcards

0
Q

Binary is base

A

2

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1
Q

All data ad instructions are in…

A

BINARY

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2
Q

Denary is base

A

10

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3
Q

Hexadecimal is base

A

16

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4
Q

1 bit per pixel is…

A

2colours black and white, monochrome

10x10 image needs 100 bits

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5
Q

4 bits (a nibble) per pixel is…

A

Greyscale

1x10 image needs 400 bits

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6
Q

3 bytes per pixel is…

A

Full colour, 1 byte for red, 1 for green and 1 for blue

10x10 image needs 300 bytes

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7
Q

16bpp is called…

A

High colour

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8
Q

What is true colour

A

24bpp

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9
Q

What is the resolution

A

The number of pixels per unit. The more pixels per inch, the more data to be stored and the larger the file

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10
Q

What is a bitmap image

A

An image where every pixel is defined.

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11
Q

Adv. of bitmap

A

Can change every pixel, strong control

Can use for photo realistic images as lots of Pixels and very complex

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12
Q

Disad of bitmap

A

Gets pixelated if zoom too much

Bigger file size than vector

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13
Q

More colours=

A

Larger file size

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14
Q

What is a vector image

A

A image created with the mathematical and geometrical data

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15
Q

Adv. of vector

A

Does not get pixelated

Small file size

16
Q

Disad. Of vector

A

No control over individual pixels

Cannot create photo realistic images

17
Q

Compression techniques:

A 
Used to reduce file size. 
JPEG /JPG used for photos
Png used for website images
Gif used for animations NEVER photos
Bmp used for drawing in paint
18
Q

The higher the sample interval…

A

The lower the sample rate

19
Q

When sound is sampled at a low rate..

A

Few samples taken
Poor match between original sound and sampled sound
Small file size

20
Q

When sampled at a high rate…

A

More samples taken
Good mTch between original and sampled sound
Large file size required

21
Q

Bit rate

A

Is the amount of space used for each sample

22
Q

Operator

A

The instruction

23
Q

Operand

A

The data part

24
Q

What is the accumulator

A

A special register in the CPU used to store there suits of any calculation

Computing (6 decks)

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