1. What do these words mean to you?
Images
Image
Picture
Pixel
Bitmap
Colour Depth
What do these words mean to you?
This slide is designed as a starting point to find a baseline of understanding.

2. Most images are what we called (enter your answer here)
When you zoom in the image is made up of little dots – do you know what these are called?
(Write your answer here)

3. Most images are what we call bitmaps
Each dot or pixel is represented by a series of 1s and (answer here).
The computer has to convert an image to binary to process it and output it to the screen.

4. Most images are what we call bitmaps
How many different combinations do you think we need if we just have black and white in our image?

5. Most images are what we call bitmaps
1 could represent black and 0 could represent white – so just two colours – 1010 would be black-white-black-white
1 bit per pixel (0 or 1): two possible colours

6. What about four colours?
Colour Depth
What about four colours?

7. We’d need to use our 1s and 0s in pairs –
Colour Depth
We’d need to use our 1s and 0s in pairs –
00 = red, 01 = green,
10 = blue and 11 = orange
2 bits per pixel (00 to 11): four possible colours

8. Most images are what we call bitmaps
3 bits per pixel (000 to 111): eight possible colours
4 bits per pixel (0000 – 1111): 16 possible colours …
16 bits per pixel ( – ): over possible colours
The number of bits used to store each pixel is called the colour depth.
Images with more colours need more pixels to store each available colour. This means that images that use lots of colours are stored in larger files.

9. Most images are what we call bitmaps
Colour depth
Available colours
1-bit
21 = 2
2-bit
22 = (2x2)
3-bit
23 = (2x2x2)
4-bit
24 = (2x2x2x2)
5-bit
25 = 32
6-bit
26 = 64
7-bit
27 = 128
8-bit
28 = 256
The greater the colour depth (bits per pixel), the more colours are available.

10. https://jumk.de/color-calculator/
Click on the following link and enter the following colours in the Binary Column
Red
Green
Blue
Colour
Pink
Purple
Sky Blue
This slide is designed as a starting point to find a baseline of understanding.

11. Explain your understanding of the words below:
Meanings
Bitmap
Pixel
Colour Depth
RGB
Metadata
This slide is designed as a starting point to find a baseline of understanding.

12. Enter the Binary numbers into each box
Enter the Binary numbers into each box. The first 2 have been done for you

13. 1Bit Bitmap 0000000000 0111001110 Activity 1: 1Bit Bitmap
Write out a series of 1s and 0s to make a black and white image in the 10x10 grid below.
Write the binary bit code for a 1Bit Bitmap in the separate binary bit code sheet. Then give this code to your neighbour and see if they can recreate your image correctly.
Bit Pattern 1

14. You may need to test your codes into the following website:
4Bit Bitmap
Activity 2:
Write the binary bit code for the 4Bit Bitmap (16 colours) in the binary bit code column.
Then get a friend to colour it in in the 10x10 grid.
Bit Pattern
You may need to test your codes into the following website:

15. You may need to test your codes into the following website:
8 Bit Bitmap
Activity 3 (Extension)
Write the binary bit code for the 8Bit Bitmap (256 colours) in the binary bit code column. Then get a friend to colour it in in the 10x10 grid. (You will need to go to More colours to specify your colour).
You may need to test your codes into the following website: