Encoding images

Question 1

Bit-map image

Answer 1

a system that uses pixels to make up an image.

Question 2

Pixel

Answer 2

smallest picture element that makes up an image.

Question 3

Colour Depth

Answer 3

a number of bits used to represent the colours in a pixel, e.g. 8-bit colour depth can represent 256 colours.

Question 4

Image Resolution

Answer 4

a number of pixels that make up an image, for example, an image could contain 4096 × 3192 pixels (12 738 656 pixels in total).

Question 5

Screen resolution

Answer 5

a number of horizontal and vertical pixels that make up a screen display. If the screen resolution is smaller than the image resolution, the whole image cannot be shown on the screen, or the original image will become lower quality.

Question 6

Bit Depth

Answer 6

a number of bits used to represent the smallest unit in, for example, a sound or image file – the larger the bit depth, the better the quality of the sound or colour image.

Question 7

Resolution

Answer 7

the number of pixels per column and per row on a monitor or television screen.

Question 8

Pixel density

Answer 8

number of pixels per square centimetre

Question 9

Vector graphics

Answer 9

images that use 2D points to describe lines and curves and their properties that are grouped to form geometric shapes.

Question 10

Sampling resolution

Answer 10

number of bits used to represent sound amplitude (also known as bit depth).

Question 11

Sampling rate

Answer 11

the number of sound samples taken per second.

Question 12

Frame rate

Answer 12

the number of video frames that make up a video per second.