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IMT > IMT Autumn Term > Flashcards

IMT Autumn Term Flashcards

1
Q

What is a digital image?

A

A rectangular grid of coloured dots called picture elements or pixels

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2
Q

What is a digital image made up of a grid of pixels called?

A

A raster image

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3
Q

Why use raster images?

A

Representing images as grids of pixels lets us store them in the computer’s memory

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4
Q

How is a raster image stored as?

A

As a list of numbers, which specify the colours of its pixels

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5
Q

What type of colour model is RGB?

A

Additive

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6
Q

What type of colour model is CMYK?

A

Subtractive

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7
Q

What does RGB stand for?

A

Red, green and blue

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8
Q

What does CMYK stand for?

A

Cyan, magenta, yellow, and key (black)

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9
Q

What does the ‘A’ stand for in the RBGA colour model?

A

The alpha channel

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10
Q

Which file formats support transparency (alpha channels)?

A

BMP, PNG and TIFF

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11
Q

Which file formats do not support transparency (alpha channels)?

A

PNG and GIF (GIF however allows you to set one colour to be a transparent background colour)

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12
Q

What is colour depth/bit depth?

A

The number of bits in memory used to store a pixel

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13
Q

Does a greater colour depth increase or decrease file size?

A

Increase

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14
Q

What does insufficient colour depth lead to?

A

Banding

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15
Q

What is the artistic use of banding called?

A

Posterization

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16
Q

What does gamut mean?

A

Gamut refers to the range of colours that can be reproduced by a colour model

17
Q

Which of the two colour models (RBG and CMYK) have a larger gamut?

A

RGB

18
Q

What does pixel resolution mean?

A

It refers to the number of pixels that make up an image

19
Q

How does a higher pixel resolution impact on an image?

A

It gives the image more detail and quality

20
Q

What is spatial resolution?

A

The relationship between the physical size and pixel dimensions

21
Q

What is spatial resolution expressed in for monitors?

A

Pixels per inch (PPI)

22
Q

What is spatial resolution expressed in for print?

A

Dots per inch (DPI)

23
Q

What is aspect ratio?

A

The proportional relationship between the width and height of an image

24
Q

What aspect ratio is used in early film?

A

4:3

25
Q

What aspect ratio is used for HD TV?

A

16:9

26
Q

What aspect ratio is used for monoscopic VR

A

2:1

27
Q

What does HSV stand for?

A

Hue (H), saturation (S) and brightness (V)

28
Q

Why use the HSV colour model?

A

It is easier to estimate the colour value and changes to hue or brightness do not require changes to all values

29
Q

What is a selection?

A

An isolated region of an image

IMT (1 decks)

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