That Blue Square Thing

AQA Computer Science GCSE

February 2019: this area of the site is being built just now. There are areas where there is no content yet. That will get added over the next 6 months or so.

Data Representation - Representing Images

All data that is used by computers has to be represented using binary numbers. Everything. Including images.

The way in which computers break down images into a grid of pixels and then apply a value to each pixel is actually fairly simple once you get your head around it.

PDF iconImage Representation - everything you need to know

PDF iconImage Representation Slides - from class to summarise and show how pixels work

All the key information is in those documents. The one below I'll tend to use in class.

PDF iconBlack and white bitmap - for printing by me and cutting up

PDF iconImage Exam Questions - some quite complex questions here which show what could be done and how this topic relates back to binary and hexadecimal. Your real questions are actually likely to be easier than these...