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RLELDMAP(1)		    General Commands Manual		   RLELDMAP(1)

NAME
       rleldmap	- Load a new color map into an RLE file

SYNOPSIS
       rleldmap	 [ -{ab} ] [ -n	nchan length ] [ -s bits ] [ -l	[ factor ] ] [
       -g gamma	] [ -{tf} file ] [ -m files ...	 ] [ -r	rlefile	] [ -o outfile
       ] [ infile ]

DESCRIPTION
       The  program  will load a specified color map into an RLE(5) file.  The
       color map may be	computed by rleldmap or	loaded from a file in  one  of
       several	formats.  The input is read from infile	or stdin if no file is
       given, and the result is	written	to outfile or stdout.

       The following terms are used in the description of the program and  its
       options:

       input map:
	      A	color map already in the input RLE file.

       applied map:
	      The  color map specified by the arguments	to rleldmap.  This map
	      will be applied to or will replace the input map to produce  the
	      output map.

       output map:
	      Unless  -a or -b is specified, this is equal to the applied map.
	      Otherwise	it will	be the composition of the  input  and  applied
	      maps.

       map composition:
	      If  the  applied	map  is	composed after the input map, then the
	      output map will be applied map[input map].   Composing  the  ap-
	      plied  map  before the input map produces	an output map equal to
	      input map[applied	map].  The maps	 being	composed  must	either
	      have  the	same number of channels, or one	of them	must have only
	      one channel.  If an entry	in the map being used as  a  subscript
	      is larger	than the length	of the map being subscripted, the out-
	      put value	is equal to the	subscript value.  The output map  will
	      be the same length as the	subscript map and will have the	number
	      of channels that is the larger of	the two.  If the input map  is
	      used  as	a subscript, it	will be	downshifted the	correct	number
	      of bits to serve as a subscript for the applied map  (since  the
	      color  map  in an	RLE(5) file is always stored left justified in
	      16 bit words).  This also	applies	to the applied map  if	it  is
	      taken from an RLE(5) file	(-r option below).  Note that if there
	      is no input map, that the	result of composition will be  exactly
	      the applied map.

       nchan: The  number  of  separate	lookup tables (channels) making	up the
	      color map.  This defaults	to 3.

       length:
	      The number of entries in each channel of the color map.  The de-
	      fault is 256.

       bits:  The  size	of each	color map entry	in bits.  The default value is
	      the log base 2 of	the length.

       range: The maximum value	of a color map entry, equal to 2**bits - 1.

OPTIONS
       -a     Compose the applied map after the	input map.

       -b     Compose the applied map before the input map.  Only one of -a or
	      -b may be	specified.

       -n nchan	length
	      Specify  the  size  of  the applied map if it is not 3x256.  The
	      length should be a power of two, and will	be rounded up if  nec-
	      essary.	If applying the	map nchan must be either 1 or equal to
	      the number of channels in	the input map.	It may have any	 value
	      if the input map has one channel or is not present.

       -s bits
	      Specify  the  size in bits of the	color map entries.  I.e., only
	      the top bits bits	of each	color map entry	will be	set.

	      Exactly one of the options -l, -g, -t, -f, -m, or	 -r,  must  be
	      specified.

       -l factor
	      Generate a linear	applied	map with the nth entry equal to
			range *	min(1.0, factor*(n/(length-1))).
	      Factor  defaults	to  1.0	 if not	specified.  Negative values of
	      factor will generate a map with values equal to
			range *	max(0.0, 1.0 - factor*(n/(length-1))).

       -g gamma
	      Generate an applied map to compensate for	 a  display  with  the
	      given gamma.  The	nth entry is equal to
			range *	(n/(length-1))**(1/gamma).

       -t file
	      Read  color map entries from a table in a	text file.  The	values
	      for each channel of a particular entry follow each other in  the
	      file.  Thus, for an RGB color map, the file would	look like:
			red0 green0    blue0
			red1 green1    blue1
			...  ...  ...
	      Line breaks in the input file are	irrelevant.

       -f file
	      Reads the	applied	map from a text	file, with all the entries for
	      each channel following each other.  Thus,	the input  file	 above
	      would appear as
			red0 red1 red2 ... (length values)
			green0 green1 green2 ... (length values)
			blue0 blue1 blue2 ... (length values)
	      As above,	line breaks are	irrelevant.

       -m files	...
	      Read  the	 color map for each channel from a separate file.  The
	      number of	files specified	must equal the number of  channels  in
	      the  applied  map.  (Note: the list of files must	be followed by
	      another flag argument or by the null flag	-- to separate it from
	      the infile specification.

       -o outfile
	      The output will be written to the	file outfile if	this option is
	      specified.  Otherwise the	output will go to stdout.

       infile The input	will be	taken from this	file if	specified.  Otherwise,
	      the input	will be	read from stdin.

SEE ALSO
       applymap(1), urt(1), RLE(5).

AUTHOR
       Spencer W. Thomas, University of	Utah

4th Berkeley Distribution	 Nov 12, 1986			   RLELDMAP(1)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | SEE ALSO | AUTHOR

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