Lesson details

Key learning points

  1. In this lesson, we will explore the most common representation of colour as a mixture of red, green, and blue: the level of each of these colours in the mixture is represented using an 8-bit sequence.

Licence

This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.

Loading...

5 Questions

Q1.
Digital images are composed of individual elements, arranged in a rectangular grid. The elements of a digital image are called .............................................
Bits
Colour Depth
Correct answer: Pixels
Q2.
The number of pixels in a digital image is the image .......................................
Raster
Reflection
Correct answer: Resolution
Q3.
3. The (fixed) number of binary digits used to represent each pixel’s colour is the colour depth . How many colours are possible with a colour depth of 7 bits?
Correct answer: 128
24
8
Q4.
Images with a high colour depth and high resolution are great because ................................. (Select all the options that apply)
Correct answer: Increased ability to capture detail
Increased Processing time
Correct answer: Increased quality
Increased storage
Correct answer: Large number of bits representing various colours
Q5.
Digital images that are formed using a binary representation of each pixel’s colour are called bitmaps or raster images. True or False?
False
Correct answer: True

5 Questions

Q1.
The two factors that determine the representation size of an image are .................................... and ............................................. [Select two answers from the given list]
Binary digit
Correct answer: Colour Depth
Raster
Reflections
Correct answer: Resolution
Q2.
An Image of oranges has a resolution of 220⨉200 and a colour depth of 4 bits. How many pixels are in this image?You can use calculator for this task.
128,000 pixels
Correct answer: 176,00 pixels
22,000 pixels
44,000 pixels
Q3.
There are 448 individual elements in an image. What is this number called?
Colour Depth
Pixel
Correct answer: Resolution
Q4.
How many different colours can there be in an image with the colour depth of 4 bits?
12
128
Correct answer: 16
8
Q5.
A rainbow icon has a file size of 240 bits . Convert this file size into bytes.
24 bytes
Correct answer: 30 bytes
80 bytes

Lesson appears in

UnitComputing / Representations: going audiovisual

Computing