Ace the 2025 OCR GCSE Computer Science Challenge – Code Your Way to Success!

The average device colour depth refers to the number of bits used to represent the colour of a single pixel in a digital image. This directly impacts the range of colours that can be displayed. A colour depth of 24 bits is commonly known as "True Colour." It allows for 16,777,216 different colour combinations, as it allocates 8 bits for each of the three primary colours—red, green, and blue. This extensive range is capable of representing a broad spectrum of colours, making it suitable for most applications in digital media, including photography and video.

In contrast, 8-bit colour allows for only 256 colours, which can lead to a somewhat limited and less vibrant display, whereas 16-bit colour depth offers 65,536 colours, which is an improvement but still does not compare to the richness of 24-bit colour. A 32-bit colour depth usually refers to an extension of 24 bits with an additional 8 bits used for transparency information (alpha channel), making it more advanced but not necessarily the "average" colour depth. Therefore, 24 bits stands out as the average in many digital devices.