1.2 Representing Characters, Images & Sounds

ASCII

American Standard Code for Information Interchange, a character encoding standard that uses 7 bits to represent up to 128 characters (0-127).

Extended ASCII

An extension of ASCII that uses 8 bits to represent up to 256 characters (0-255).

Unicode

A universal character encoding standard that supports 65,536 characters (16-bit), including emoji’s and language symbols (like Chinese, Arabic etc.)

Bitmap

An image format made up of pixels, with each pixel having a binary code representing its color.

Vector

An image format made up of geometric shapes.

Colour Depth

The number of bits used to represent colors in a pixel.

Image Resolution

The level of detail in an image, usually measured in pixels per inch, affecting the clarity and sharpness of the image.

Meta Data

Information about an image file, such as resolution, color depth, creation date, and location.

File Size Calculation

Formula to calculate image file size in bits based on color depth, image height, and image width.

Sample Rate

The frequency at which sound is sampled every second, influencing the quality and file size of digital sound.