Session 3 - Digital Images

This is a short session looking at the structure of pixels in a digital image. It will help you understand how the number of bits used per pixel determines the number of colours that are available.

1. Open the Information document and read through the information about digital images. Look at how using two bits gives you 4 different combinations and therefore 4 different possible colours. The notes tell you the bit pattern for an image including the height and width of the image. Look at the given example in blue, green and yellow and then the bit pattern underneath. Underline the different colours in the bit pattern to identify them. Take care to look at the order of the colours in the bit pattern.
2. Decode the digital image by reading the bit pattern and making the given image. Use the grid to recreate the image from the list of bits on page 2. Remember the bits contain the height and width.
3. Make your own image on the grid given in task1 in the Workbook. You are going to have 4 bits per pixel for colour. Complete the grid with the colours and bit numbers first to create your own colour scheme. In task 2 use the larger picture grid to create your own image using these colours. Then complete task 3 by writing the bit pattern remembering to include the width and height at the end.