Convert images into binary and back again. In GCSE, you may be asked to represent a given image in a binary format, or vice versa. These are often black and white images. We know that we need to use bits of information to represent colors. And therefore, if we only have black and white to represent, we need only use a single bit per pixel. Here pixels are represented by squares.

If we have more colors to represent, we would need to use two or more bits per pixel. We need to choose which color we're going to represent by zero and which by one usually in the question it will tell you, but if it doesn't, then you are free to choose. In this example, zero is used to represent white and one is used to represent black as can be seen from the binary in the completed grid. If the square was meant to be white, then a zero has been placed. If a square was meant to be black, then a 100 in place. Here's one for you to have a go and use zero for white and one for black.

Please pause the video whilst you try it. Check your answer against the one that's shown in the grid. Another example for you to try. This time you need to fill in the blank grid to build up the image. Again pause the video while should have about this your image should be the same as shown on the screen.