Images/Pixels
An image, digital image, or still image is a binary representation of visual information, such as drawings, pictures, graphs, logos, or individual video frames.
Source: https://www.computerhope.com/jargon/i/image.htm
Common image file formats online include:
JPEG (pronounced JAY-peg) is a graphic image file produced according to a standard from the Joint Photographic Experts Group, an ISO/IEC group of experts that develops and maintains standards for a suite of compression algorithms for computer image files. JPEGs usually have a .jpg file extension.
GIF (pronounced JIF by many, including its designer; pronounced GIF with a hard G by many others) stands for Graphics Interchange Format. The GIF uses the 2D raster data type and is encoded in binary. GIF files ordinarily have the .gif extension.
GIF89a is an animated GIF image, formatted according to GIF Version 89a. One of the chief advantage format is the ability to create an animated image that can be played after transmitting to a viewer page that moves - for example, a twirling icon or a banner with a hand that waves or letters that magically get larger. A GIF89a can also be specified for interlaced GIF presentation.
PNG (pronounced ping ) is a Portable Network Graphics) is a file format for image compression that was designed to provide a number of improvements over the GIF format. Like a GIF, a PNG file is compressed in lossless fashion (meaning all image information is restored when the file is decompressed during viewing). Files typically have a .png extension.
SVG is Scalable Vector Graphics, the description of an image as an application of XML. Any program such as a browser that recognizes XML can display the image using the information provided in the SVG format. Scalability means that the file can be viewed on a computer display of any size and resolution, whether the small screen of a smartphone or a large widescreen display in a PC. Files usually have .svg extension.
TIFF (Tag Image File Format) is a common format for exchanging raster graphics (bitmap) images between application programs, including those used for scanner images. A TIFF file can be identified as a file with a .tiff or ".tif" file name suffix.
A pixel is the smallest unit of a digital image or graphic that can be displayed and represented on a digital display device.
A pixel is the basic logical unit in digital graphics. Pixels are combined to form a complete image, video, text, or any visible thing on a computer display.
A pixel is also known as a picture element (pix = picture, el = element).
Source: https://www.techopedia.com/definition/24012/pixel
Computer screens and related devices also rely on mixing three colours, except they need a different set of primary colours because they are additive, starting with a black screen and adding colour to it. For additive colour on computers, the colours red, green and blue (RGB) are used. Each pixel on a screen is typically made up of three tiny "lights"; one red, one green, and one blue. By increasing and decreasing the amount of light coming out of each of these three, all the different colours can be made.
Source: https://www.csfieldguide.org.nz/en/chapters/data-representation/images-and-colours/