SQA National 5 Computing Science Practice Exam 2025 – The Complete Guide to Mastering Your Exam!

True Colour refers to a color representation system that can display a wide spectrum of colors. In the True Colour model, colors are typically represented using three primary colors: red, green, and blue (RGB). Each of these primary colors is allotted 8 bits, allowing for 256 different intensity levels (ranging from 0 to 255) for each color.

When you combine the three primary colors in True Colour, the total number of bits used for color representation is calculated as follows: 8 bits for red + 8 bits for green + 8 bits for blue, leading to a total of 24 bits. This setup provides the ability to represent approximately 16.7 million different colors (2^24), which is sufficient for most applications requiring high color fidelity, such as digital images and video.

The other options reflect alternative color depth representations but do not match the 24-bit standard used for True Colour. For instance, 16 bits may represent High Colour with fewer colors than what True Colour can display, while 32 bits often refers to an additional alpha channel for transparency, not solely for color representation. Finally, 8 bits would represent a very limited color range, typically 256 colors, which is not sufficient for True Colour