Browse Definitions :
Definition

RGB (red, green, and blue)

Also see palette.

RGB (red, green, and blue) refers to a system for representing the colors to be used on a computer display. Red, green, and blue can be combined in various proportions to obtain any color in the visible spectrum. Levels of R, G, and B can each range from 0 to 100 percent of full intensity. Each level is represented by the range of decimal numbers from 0 to 255 (256 levels for each color), equivalent to the range of binary numbers from 00000000 to 11111111, or hexadecimal 00 to FF. The total number of available colors is 256 x 256 x 256, or 16,777,216 possible colors.

In the Hypertext Markup Language (HTML), the color for a page background or text font is specified by an RGB value, expressed with six digits in hexadecimal format. The first and second digits represent the red level; the third and fourth digits represent the green level; the fifth and sixth digits represent the blue level. In order to actually display the colors for all possible values, the computer display system must have 24 bits to describe the color in each pixel. In display systems or modes that have fewer bits for displaying colors, an approximation of the specified color will be displayed.

In creating Web pages, the number of RGB values that are recommended for use is considerably reduced - first, by the fact that many displays can handle only 256 colors and, secondly, because PC and Mac Web browsers handle 40 of these 256 colors slightly differently. In order to ensure that your colors will be consistent on both browsers, a palette of the 216 colors common to both PC and Web browsers is recommended. Any color outside of these will be dithering (approximated).

This was last updated in April 2005

Join the conversation

2 comments

Send me notifications when other members comment.

Please create a username to comment.

great aricle
Cancel
if i have value of R =4,G=6 and B=8 so the color are 262144...correct?
Cancel

-ADS BY GOOGLE

File Extensions and File Formats

SearchCompliance

  • compliance audit

    A compliance audit is a comprehensive review of an organization's adherence to regulatory guidelines.

  • regulatory compliance

    Regulatory compliance is an organization's adherence to laws, regulations, guidelines and specifications relevant to its business...

  • Whistleblower Protection Act

    The Whistleblower Protection Act of 1989 is a law that protects federal government employees in the United States from ...

SearchSecurity

  • orphan account

    An orphan account, also referred to as an orphaned account, is a user account that can provide access to corporate systems, ...

  • voice squatting (skill squatting)

    Voice squatting is an attack vector for voice user interfaces (VUIs) that exploits homonyms (words that sound the same but are ...

  • WPA3

    WPA3, also known as Wi-Fi Protected Access 3, is the third version of the security certification program developed by the Wi-Fi ...

SearchHealthIT

SearchDisasterRecovery

  • business continuity policy

    Business continuity policy is the set of standards and guidelines an organization enforces to ensure resilience and proper risk ...

  • business continuity and disaster recovery (BCDR)

    Business continuity and disaster recovery (BCDR) are closely related practices that describe an organization's preparation for ...

  • warm site

    A warm site is a type of facility an organization uses to recover its technology infrastructure when its primary data center goes...

SearchStorage

  • cache memory

    Cache memory, also called CPU memory, is high-speed static random access memory (SRAM) that a computer microprocessor can access ...

  • enterprise storage

    Enterprise storage is a centralized repository for business information that provides common data management, protection and data...

  • disk array

    A disk array, also called a storage array, is a data storage system used for block-based storage, file-based storage or object ...

Close