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CMAP(5)			      File Formats Manual		       CMAP(5)

       cmap - format of	.cmap files (color maps)

       Color-map  files	define the mapping between eight-bit color numbers and
       red, green and blue intensities used for	those numbers.	They are  read
       by  Magic  as  part  of system startup, and also	by the :load and :save
       commands	in color-map windows.  Color-map file names usually  have  the
       form  x.y.z.cmapn, where	x is a class of	technology files, y is a class
       of displays, z is a class of monitors, and n is a version number	 (cur-
       rently  1).  The	version	number will change in the future if the	format
       of color-map files ever changes.	 Normally, x and y correspond  to  the
       corresponding  parts  of	a display styles file.	For example, the color
       map file	mos.7bit.std.cmap1 is used today for most nMOS and CMOS	 tech-
       nology  files  using displays that support at least seven bits of color
       per pixel and standard-phosphor monitors.  It corresponds to  the  dis-
       play styles file	mos.7bit.dstyle5.

       Color-map  files	 are  stored  in ASCII form, with each line containing
       four decimal integers separated by white	space.	The first three	 inte-
       gers  are  red,	green, and blue	intensities, and the fourth field is a
       color number.  For current displays the intensities  must  be  integers
       between	0 and 255.  The	color numbers must increase from line to line,
       and the last line must have a color number of 255.  The red, green, and
       blue intensities	on the first line are used for all colors from 0 up to
       and including the color number on that line.  For other lines, the  in-
       tensities on that line are used for all colors starting one color above
       the color number	on the previous	line and continuing up and through the
       color  number on	the current line.  For example,	consider the color map

       255     0       0       2
       0       0       255     3
       255     255     255     256

       This color map indicates	that colors 0, 1, and 2	are to be red, color 3
       is to be	blue, and all other colors are to be white.

       magic(1), dstyle(5)

4th Berkeley Distribution					       CMAP(5)


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