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Our Glossary clarifies words and terms used at AbleStable® and by creative people in general. If you have any suggestions for words or terms you feel should be included here, go to Submissions.

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Hacking involves unauthorised access to a computer, its files and programs. It is highly unlikely a private individual will be the target of a hacker.

The method of producing a range of tones, such as a photograph or tinted area, by dividing the image into a series of dots. Dark areas have relatively big dots, close together. Light areas have small dots surrounded by white space. The number of dots used determines the quality of the image produced. In a newspaper the halftone dots are easily visible to the naked eye - the screen used can often be as coarse as 60 dpi (dots per inch). A colour magazine would typically use a screen of 150 dpi - An art book, 175 dpi or finer.

A halftone screen can be applied to a solid colour in order to produce tints of that colour.

Hash (CR32 or MD5 values)
A hash function is a function that converts an input from a (typically) large domain into an output in a (typically) smaller range (the hash value, often a subset of the integers). Hash functions vary in the domain of their inputs and the range of their outputs and in how patterns and similarities of input data affect output data.

A cyclic redundancy check (CRC) is a type of hash function used to produce a checksum, which is a small number of bits, from a large block of data, such as a packet of network traffic or a block of a computer file, in order to detect errors in transmission or storage. A CRC is computed and appended before transmission or storage, and verified afterwards to confirm that no changes occurred.

In cryptography, MD5 (MessageDigest algorithm 5) is a widelyused cryptographic hash function with a 128bit hash value. As an Internet standard, MD5 has been employed in a wide variety of security applications, and is also commonly used to check the integrity of files.

Hexadecimal RGB
Values of Red, Green, and Blue, where each component has a hexadecimal value from 00 to FF. 00-00-00 is black and FF-FF-FF is white.

A company that rents out space on the Internet to allow you to place web pages on it.

keyboard shortcut (also known as an accelerator key, shortcut key, or hotkey) is a set of keyboard keys that when pressed simultaneously, perform a predefined task. Such a task could be done with the mouse (or other analog input such as a trackball), but would require much longer. Hence, they are a shortcut in that they save the user time.

Values of Hue, Saturation, and Brightness, where Hue has a value from 0 to 360 degrees, and Saturation and Brightness have a value from 0 to 100%.

'Hue, saturation, luminance.' An alternative to the RGB scheme for specifying colours, in which the hue, saturation and luminance are given. 'Hue' relates to the primary colour content of the colour, and a number which specifies how close it is to red, green or blue. Saturation is the 'whiteness' or the colour; for example a highly saturated red is pink. Luminance is the intensity of the colour.

HTML stands for HyperText Markup Language, the common language of documents on the web.

Hypertext Transfer Protocol HTTP) is the protocol standard for regulating the way computers transmit data on the Internet. Many Internet addresses begin http, for example:

Hypertext Transfer Protocol Secure is the required protocol for pages that require a SSL connection.

A hypertext link is a special word or phrase in a web page that 'points' to another page.

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