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.

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)

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.

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?

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

What about four colours? Colour Depth What about four colours?

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

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 (0000 0000 0000 0000 – 1111 1111 1111 1111): over 65 0000 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.

Most images are what we call bitmaps Colour depth Available colours 1-bit 21 = 2 2-bit 22 = 4 (2x2) 3-bit 23 = 8 (2x2x2) 4-bit 24 = 16 (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. http://www.bbc.co.uk/education/guides/zqyrq6f/revision/2

https://jumk.de/color-calculator/ Click on the following link and enter the following colours in the Binary Column https://jumk.de/color-calculator/ https://jumk.de/color-calculator/ Red Green Blue Colour 11111111 00000000 01010101 Pink Purple Sky Blue This slide is designed as a starting point to find a baseline of understanding.

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.

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

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 0000000000 0111001110 1

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: https://jumk.de/color-calculator/

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: https://jumk.de/color-calculator/