In this activity, students create colour images from satellite data. This allows them to study how different surfaces reflect different wavelengths of light, how coloured images are created using an RGB model, and how band combinations can be chosen to examine a particular landscape effectively.

This investigation from Cre8ate maths involves students in finding the best size screen for a television. If you have a large flat screen and view a standard analogue or digital picture the individual pixels are visible if you are sitting too close to the screen. Working in small groups of 3 or 4, students measure...

This activity allows students to investigate how images are produced from data streams by using first a spreadsheet and then an image-processing program. They then go on to see how the usefulness of such a monochromatic image may be enhanced by using lookup tables and calibration. The materials used focus on the...

This activity from Cre8ate maths develops understanding of enlargement.

Students work in groups and, intuitively, sort sets of photos to identify those which have been enlarged from an original image. They then...