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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.
References in periodicals archive ?
The home energy management services are delivered to homeowners through an interactive website, MyHomeWorks, which is branded to insurance companies that partner with HSB to offer the coverage.
Some utilities charge around $6 a month to cover the repair of a single water line, and damaged property is excluded, she said, but HSB charges insurers $20 a year, and the insurer adds an amount so that the insured might pay about $30.
Given its total lack of experience with either the installation or management of a high speed network system, the IT department decided that a vendor should be contracted to install the HSIA system in all of the HSB guest rooms.
These problems are eliminated with HSB with only a minor change in deceleration time and huge cost savings.
HSB has executed a restructuring plan, including a reduction of mortgage staff.
Transitioning management of over 100 applications to a managed services model enabling HSB to manage by outcomes with an SLA driven approach.
NORDIC BUSINESS REPORT-May 8, 2015-Peab awarded SEK181m contract to build 116 Apartments in A-rebro for HSB
BANKING AND CREDIT NEWS-October 12, 2010--AM Best keeps HSB Engineering Insurance's A+ FSR(C)2010 M2 COMMUNICATIONS http://www.
Most homeowners don't know that they own outdoor service lines and are responsible for repairs, which can total $3,500 or more, HSB said.
Leeds Crown Court had heard Azam Yaqoob had received the cash from a fraudulent claim against Oldham-based engineering insurance firm HSB.
HSB 3042NA High Solids Hollow Plus Binder is the product of advanced Dow processing technology which combines Dow's hollow sphere plastic pigment and styrene/butadiene (S/B) latex binder chemistries to create a unique pigment/binder combination.
TELECOMWORLDWIRE-7 August 2002-Telia to provide broadband Internet to HSB Sverige members (C)1994-2002 M2 COMMUNICATIONS LTD http://www.