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In computing, on the X Window System, X11 color names are represented in a simple text file, which maps certain strings to RGB color values. It is shipped with every X11 installation, hence the name, and is usually located in ''<X11root>''/lib/X11/rgb.txt. The web colors list is descended from it.Color names are not standardized by Xlib or the X11 protocol. The list does not show continuity either in selected color values or in color names, and some color triplets have multiple names. Despite this, graphic designers and others got used to them, making it practically impossible to introduce a different list. In earlier releases of X11 (prior to the introduction of Xcms), server implementors were encouraged to modify the RGB values in the reference color database to account for gamma correction. The list first shipped with X10 release 3 (X10R3) on 7 June 1986, having been checked into RCS by Jim Gettys in 1985.〔(【引用サイトリンク】title=~alanc/xc-historical - Partial/incomplete import of X consortium historical RCS up to X11R6.0 )〕 The same list was in X11R1 on 18 September 1987. Approximately the full list as is available today shipped with X11R4 on 29 January 1989, with substantial additions by Paul Ravelling (who added colors based on Sinclair Paints samples), John C. Thomas (who added colors based on a set of 72 Crayola crayons he had on hand) and Jim Fulton (who reconciled contributions to produce the X11R4 list). The project was running DEC VT240 terminals at the time, so would have worked to that device. As of X.Org Release 7.4 rgb.txt is no longer included in the roll up release,〔(【引用サイトリンク】title=ModuleVersions )〕 and the list is built directly into the server. The optional module xorg/app/rgb contains the stand-alone rgb.txt file. In some applications multipart names are written with spaces, in others joined together, often in camel case. They are usually matched insensitive of case and the X Server source code contains spaced aliases for most entries; this article uses spaces and uppercase initials except where variants with spaces are not specified in the actual code. == Clashes between web and X11 colors == The first versions of Mosaic and Netscape Navigator used the X11 colors as the basis for the web colors list, as both were originally X applications. The W3C specifications SVG and CSS level 3 module Color eventually adopted the X11 list with some changes. It is a superset of the 16 “VGA colors” defined in HTML 3.2 and CSS level 1. Perhaps most unusual of the color clashes between X11 and W3C is the case of 'Gray'. In HTML, 'Gray' is specifically reserved for the 128 triplet, i.e. 50% gray . However, in X11, 'gray' was assigned to the 190 triplet, i.e. 75% , which is close to W3C 'Silver' , and had 'Light Gray' at 211 and 'Dark Gray' at 169 counterparts. This resulted in W3C's 'Gray', at 50%, actually being significantly darker than 'Dark Gray', at 66%. Some browsers like Netscape Navigator insisted on an 'a' in any 'Gr''a''y' except for 'Light Gr''e''y'. The W3C also defined a color that is equal to X11's 'Green', but called it 'Lime'. Recent X releases also support the W3C definitions. Conflicting names have a 'Web' prefix and there are also aliases with an 'X11' prefix for disambiguation, i.e. 'X11 Green' = 'Green' ≠ 'Web Green' = 'Lime'. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「X11 color names」の詳細全文を読む スポンサード リンク
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