Year 9
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Lesson details
Key learning points
- 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.
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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
Q2.
The number of pixels in a digital image is the image .......................................
Raster
Reflection
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?
24
8
Q4.
Images with a high colour depth and high resolution are great because ................................. (Select all the options that apply)
Increased Processing time
Increased storage
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
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
Raster
Reflections
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
22,000 pixels
44,000 pixels
Q3.
There are 448 individual elements in an image. What is this number called?
Colour Depth
Pixel
Q4.
How many different colours can there be in an image with the colour depth of 4 bits?
12
128
8
Q5.
A rainbow icon has a file size of 240 bits . Convert this file size into bytes.
24 bytes
80 bytes