XQueryColor(3X11)														 XQueryColor(3X11)

NAME

       XQueryColor, XQueryColors, XLookupColor, XParseColor - obtain color values

SYNOPSIS

       XQueryColor(display, colormap, def_in_out)
	       Display *display;
	       Colormap colormap;
	       XColor *def_in_out;

       XQueryColors(display, colormap, defs_in_out, ncolors)
	       Display *display;
	       Colormap colormap;
	       XColor defs_in_out[];
	       int ncolors;

       Status XLookupColor(display, colormap, color_name, exact_def_return, screen_def_return)
	       Display *display;
	       Colormap colormap;
	       char *color_name;
	       XColor *exact_def_return, *screen_def_return;

       Status XParseColor(display, colormap, spec, exact_def_return)
	       Display *display;
	       Colormap colormap;
	       char *spec;
	       XColor *exact_def_return;

ARGUMENTS

       Specifies  the colormap.  Specifies the color name string (for example, red) whose color definition structure you want returned.  Specifies
       and returns the RGB values for the pixel specified in the structure.  Specifies and returns an array of color definition structures for the
       pixel specified in the structure.  Specifies the connection to the X server.  Returns the exact RGB values.  Specifies the number of XColor
       structures in the color definition array.  Returns the closest RGB values provided by the hardware.  Specifies the color name string;  case
       is ignored.  Returns the exact color value for later use and sets the DoRed, DoGreen, and DoBlue flags.

DESCRIPTION

       The XQueryColor function returns the current RGB value for the pixel in the XColor structure and sets the DoRed, DoGreen, and DoBlue flags.
       The XQueryColors function returns the RGB value for each pixel in each XColor structure and sets the DoRed, DoGreen, and  DoBlue  flags	in
       each structure.

       XQueryColor and XQueryColors can generate BadColor and BadValue errors.

       The  XLookupColor  function  looks  up  the  string  name of a color with respect to the screen associated with the specified colormap.	It
       returns both the exact color values and the closest values provided by the screen with respect to the visual type  of  the  specified  col-
       ormap. If the color name is not in the Host Portable Character Encoding, the result is implementation dependent. Use of uppercase or lower-
       case does not matter.  XLookupColor returns nonzero if the name is resolved; otherwise, it returns zero.

       The XParseColor function looks up the string name of a color with respect to the screen associated with the specified colormap.	It returns
       the  exact  color  value.  If the color name is not in the Host Portable Character Encoding, the result is implementation dependent. Use of
       uppercase or lowercase does not matter.	XParseColor returns nonzero if the name is resolved; otherwise, it returns zero.

       XLookupColor and XParseColor can generate BadColor error.

COLOR NAMES

       An RGB Device specification is identified by the prefix "rgb:" and conforms to the following syntax:

       rgb:<red>/<green>/<blue>

	   <red>, <green>, <blue> := h | hh | hhh | hhhh
	   h := single hexadecimal digits (case insignificant)

       Note that h indicates the value scaled in 4 bits, hh the value scaled in 8 bits, hhh the value scaled in 12 bits, and hhhh the value scaled
       in 16 bits, respectively.

       For  backward compatibility, an older syntax for RGB Device is supported, but its continued use is not encouraged. The syntax is an initial
       sharp sign character followed by a numeric specification, in one of the following formats:

       #RGB		   (4 bits each) #RRGGBB	     (8 bits each) #RRRGGGBBB	       (12 bits each) #RRRRGGGGBBBB	  (16 bits each)

       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".

       An RGB intensity specification is identified by the prefix "rgbi:" and conforms to the following syntax:

       rgbi:<red>/<green>/<blue>

       Note  that  red, green, and blue are floating-point values between 0.0 and 1.0, inclusive. The input format for these values is an optional
       sign, a string of numbers possibly containing a decimal point, and an optional exponent field containing an E or e followed by  a  possibly
       signed integer string.

       The standard device-independent string specifications have the following syntax:

       CIEXYZ:<X>/<Y>/<Z> CIEuvY:<u>/<v>/<Y> CIExyY:<x>/<y>/<Y> CIELab:<L>/<a>/<b> CIELuv:<L>/<u>/<v> TekHVC:<H>/<V>/<C>

       All  of the values (C, H, V, X, Y, Z, a, b, u, v, y, x) are floating-point values. The syntax for these values is an optional plus or minus
       sign, a string of digits possibly containing a decimal point, and an optional exponent field consisting of an "E" or  "e"  followed  by	an
       optional plus or minus followed by a string of digits.

DIAGNOSTICS

       A  value  for  a  Colormap argument does not name a defined Colormap.  Some numeric value falls outside the range of values accepted by the
       request. Unless a specific range is specified for an argument, the full range defined by the argument's type  is  accepted.   Any  argument
       defined as a set of alternatives can generate this error.

SEE ALSO

       XAllocColor(3X11), XCreateColormap(3X11), XStoreColors(3X11)

       Xlib -- C Language X Interface

																 XQueryColor(3X11)