Data Representation Flashcards

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1
Q

What factors effect the file size of an image?

A
  • Colour depth

- Image Resolution (The amount of pixels in an image)

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2
Q

What is the colour depth and how do you work it out?

A

It’s the amount of bits in a pixel that can present a colour. The more bits there are, the more colour can be displayed

  • 4 bit colour depth 16 colours (2^4)
  • 8 bit colour depth = 256 (2^8)
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3
Q

How do you work out the file size of an image?

A

Resolution (pixels x pixels) x colour depth = file size

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4
Q

Where are image data stored?

A

They are stored in files where binary data is placed into a bit map.

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5
Q

Why do some image files have more bytes than expected?

A

Metadata such as:

  • Data when photo was taken
  • Name of file
  • Location of take image
  • details of the image
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6
Q

What is the difference between analogue and digital sound waves?

A

Analog are continuous and are always ‘smooth’

Digital are discrete and are a measurement of analogy waves.

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7
Q

What are the audio converters.

A

ADC - Analog-to-Digital Converter

DAC- Digital-to-Analog Converter.

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8
Q

What factors affect the file size of an audio file?

A
  • Sample resolution (Audio Bit depth)
  • Sample rate (Amount of analogue readings taken per second- 1hz = 1 sample per second)
  • Seconds of audio
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9
Q

How do you calculate audio file size?

A

Audio bit depth (bits) x Hertz (Hz) x seconds = File Size (bytes)

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