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<HTML><HEAD><TITLE>Xlib Programming Manual: RGB Device String Specification</TITLE></HEAD><BODY><H1 ALIGN=center>6.2.1 RGB Device String Specification</H1>An RGB Device specification is identified bythe prefix ``rgb:'' and conforms to the following syntax:<P><CODE><PRE>rgb:<B><red>/<green>/<blue></B> <B><red></B>, <B><green></B>, <B><blue></B> := <B>h</B> | <B>hh</B> | <B>hhh</B> | <B>hhhh</B> <B>h</B> := single hexadecimal digits (case insignificant)</PRE></CODE><P>Note that <B>h</B> indicates the value scaled in 4 bits, <B>hh</B> the value scaled in 8 bits,<B>hhh</B> the value scaled in 12 bits,and <B>hhhh</B> the value scaled in 16 bits, respectively.<P>Typical examples are the strings ``rgb:ea/75/52'' and ``rgb:ccc/320/320'',but mixed numbers of hexadecimal digit strings (``rgb:ff/a5/0'' and ``rgb:ccc/32/0'')are also allowed.<P>For backward compatibility, an older syntax for RGB Device issupported, but its continued use is not encouraged.The syntax is an initial sharp sign character followed bya numeric specification, in one of the following formats:<P><CODE><PRE>#RGB (4 bits each)#RRGGBB (8 bits each)#RRRGGGBBB (12 bits each)#RRRRGGGGBBBB (16 bits each)</PRE></CODE><P>The R, G, and B represent single hexadecimal digits.When fewer than 16 bits each are specified, they represent the most-significant bits of the value(unlike the ``rgb:'' syntax, in which values are scaled).For example, the string ``#3a7'' is the same as ``#3000a0007000''.<H5 ALIGN=right><I>Next: <A HREF="intensity.html">RGB Intensity String Specification</A></I></H5><HR><ADDRESS><A HREF="http://tronche.com/">Christophe Tronche</A>, <A HREF="mailto:ch.tronche@computer.org">ch.tronche@computer.org</A></ADDRESS></BODY></HTML>⌨️ 快捷键说明
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