Learn: Image Representation

Welcome!Today we'll learn about image representation. This topic explains how computers store and display images using binary data. Let's break it down step by step!

What is an Image?An image is a visual representation made up of tiny elements called pixels. Each pixel contains colour information, and when combined, they form a complete picture.

Pixels and Colour DepthPixels are the smallest units of an image. Colour depth refers to the number of bits used to represent the colour of a pixel. Higher colour depth means more colours are available.

MetadataMetadata is data about data. For images, metadata includes details like width, height, colour depth, and file format. It helps computers understand how to display the image correctly.

ResolutionResolution is the number of pixels in an image, typically expressed as width × height (e.g., 1920 × 1080). Higher resolution means more detail but larger file sizes.

File Size FormulaThe size of an image file can be calculated using the formula: file size = colour depth × width × height. This helps estimate storage requirements for digital images.

CompressionCompression reduces the file size of images. There are two types: lossy compression, which removes some data, and lossless compression, which preserves all data. Compression is useful for saving storage space.

Review Time!Great work! You've learned about image representation, including pixels, colour depth, resolution, metadata, and compression. Now let's test your understanding with a few final questions!