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(Hue Saturation Brightness) A color space (color model) that is widely used to select a color in a paint program, image editing or other graphics application. HSB was developed by Alvy Ray Smith at PARC in 1974 to enable users to select colors in software as artists traditionally had done in oils by adding black and white to pure pigments. It was soon incorporated into SuperPaint, one of the first paint programs, letting users select colors more intuitively than by adjusting RGB or CMYK colors. Today, HSB continues to let users easily make color adjustments.

Hue, Saturation and Brightness
Called "HSV" by its inventor with the V meaning "value," the hue (H) is the color pigment represented by a 360-degree circle (0=red, 60=yellow, 120=green, 180=cyan, 240=blue, 300=magenta). The saturation (S) is the amount of white added, and the brightness (B) the amount of black. Both S and B are measured from 0 to 100% or from 0 to 1.

HSB and HSL, which was created by George Joblove in 1978, are the most widely used hue-based models for color selection in graphics applications. For example, in Photoshop, HSB is used to select a color, and HSL is used to change colors in an image. HSB and HSL are mathematical subsets of the CIE Lab model and are not based on actual human perception of colors as is CIE Lab. Although not shown in this definition, HSB and HSL are often expressed geometrically as an inverted cone and double cone: H is the angle around the axis; S measures from the axis outward and B/L from top to bottom.

Although both models are based on the hue, saturation and brightness/lightness triplet, hue (H) is similar, but saturation (S) and brightness/lightness (B/L) are not. One of the main differences is that in HSB, the B dimension includes nothing about the whiteness of the color, only its blackness, whereas in HSL, the L axis carries both white and black information. See HSL, CIE Lab and color space.

The Photoshop Color Picker
This Photoshop control is used to select a color by pointing in the box or moving the vertical slider. The same color is depicted in HSB, RGB, CIE Lab and CMYK color spaces, and users can choose whichever model they wish to make adjustments.

Used in SuperPaint
When HSB was added to this early paint program in the 1970s, it let video and graphics people select colors like an artist. There were no color pickers like the Photoshop dialog above. (Image courtesy of Richard Shoup.)

From Red to Pink
As is evident in this example, HSB and HSL differ in their approach. However, notice how much more "paint oriented" both models are versus RGB, which is why they are widely used. For invaluable information about color spaces and computer graphics (CG) from one of the country's most distinguished experts, visit www.alvyray.com, and click Papers, then CG.
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
References in periodicals archive ?
A digital survey consisting of 43 questions was generated addressing issues surrounding the application to and attendance of graduate school in biological anthropology programs that focused on training in HSB. This survey was hosted using Qualtrics survey software (Snow 2012), a digital data-collection platform.
HSB is a Washington state-chartered commercial bank with a network of more than 100 retail branches, home loan centers, and commercial and residential construction lending centers in the western U.S.
Both the BEC and NFW DM models give comparable [[chi square].sub.min] values (within 1a confidence level) for HSB I galaxies.
"The addition of this online program provides HSB with the power to communicate and engage with food industry partners from all over the world," says Stephen Porth, Ph.D.
We consider the upper portion to be indicative of the release from the shallow hsB aquifer, while the lower portion is indicative of the deeper bedrock aquifer and the corresponding model is parameterized appropriately to match the baseflow recession characteristics.
Signed by Governor--HF 550/SF 347 (Was HSB 152) CONDITIONAL EMPLOYMENT (Human Resources) Heaton Allows for conditional employment for various employees (employees of health care facilities, certified nurse aide students, prospective employees of nursing facilities, residential care facilities and other related professions) who after a required records check prior to employment, are subject to a DHS evaluation.
The objective of the pilot study was to get a clearer view of these householders' presumptions of the NBN and their expectations of high-speed broadband (HSB) and, concomitantly, to get a clearer view of their motivations for adoption or non-adoption (Wilken at al., 2011).
* Hartford Steam Boiler Inspection & Insurance Company (HSB), a global specialty insurer and reinsurer, signed a new lease at 100 Wall Street, occupying 2,427 s/f on a the 6th floor for a six-year term.
International Resource News-February 24, 2012--Ronn Motor Company signs sales agreement with HSB Permian LLC(C)1994-2012 ENPublishing - http://www.enpublishing.co.uk
"Bob was committed to the success of our industry as demonstrated by his work with PPI's Hydrostatic Stress Board (HSB), and serving for many years on our board of directors and on various committees and task groups.
Sales of its own brews, which also include Honey Dew and HSB, returned to growth in the past quarter while sales at managed pubs and hotels increased their rate of growth.
The service-line coverage is the third that HSB now offers to homeowners writers as a turnkey product that can be embedded in homeowners policies or offered in an endorsement.