Representing Images

Digital images are composed of individual elements, arranged in a rectangular grid. The elements of a digital image are called

• Colour Depth

• Pixels

• Bits

• Binary

The number of binary digits (1s and 0s) used to represent each pixel’s colour is the colour depth . A colour depth of 1 can have 2 colours (1 and 0), a colour depth of 2 can have 4 colours (11, 00, 01, 10).

How many colours are possible with a colour depth of 7 bits?

Images with a high colour depth and high resolution are great because ................................. (Select all the options that apply)

• More colours available

• Increased quality

• Increased storage

• Increased ability to capture detail

• Faster to send

The number of pixels in a digital image is the image .......................................

• Colour Depth

• Resolution

• Quality

• Pixels

The two factors that determine the representation size of an image are .................................... and ............................................. [Select two answers from the given list]

• Reflections

• Resolution

• Raster

• Binary

• Colour Depth

An Image of oranges has a resolution of 220⨉200 and a colour depth of 4 bits. How many pixels are in this image?

How many different colours can there be in an image with the colour depth of 4 bits?

• 8

• 16

• 12

• 128

A rainbow icon has a file size of 240 bits . Convert this file size into bytes.

• 30

• 80

• 24