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URT(1)									URT(1)

       urt - overview of the Utah Raster Toolkit

       applymap	  Apply color map to image data.
       avg4	  Simple 2x2 downsizing filter.
       crop	  Crop image.
       cubitorle  Convert Cubicomp format to RLE.
       dvirle	  Typeset TeX ".dvi" files as RLE images.
       fant	  Image scale/rotate with anti-aliasing.
       get4d	  Display on SGI Iris/4D display.
       get_orion  Display on "Orion" display.
       getap	  Display on Apollo.
       getbob	  Display under HP window system.
       getcx3d	  Display RLE on Chromatics CX3D.
       getfb	  Display using BRL generic fb library.
       getgmr	  Display on Grinnell GMR-27 frame buffer.
       getiris	  Display on SGI 2400/3000 w/o window manager.
       getmac	  Display on Mac under MPW.
       getmex	  Display on SGI under the window manager.
       getqcr	  Display on Matrix QCR camera.
       getren	  Display on HP SRX.
       getsun	  Display using SunTools.
       getx10	  Display on X10 display.
       getx11	  Display using X11.
       giftorle	  Convert GIF files to RLE.
       graytorle  Convert separate rrr ggg bbb files to RLE.
       mcut	  Median cut color quantization.
       mergechan  Merge colors from multiple images.
       painttorle Convert MacPaint to RLE.
       pgmtorle	  Convert PBMPLUS pgm format to RLE.
       ppmtorle	  Convert PBMPLUS ppm format to RLE.
       pyrmask	  Generate "pyramid" filter mask.
       rastorle	  Convert Sun Raster to RLE.
       rawtorle	  Convert various raw formats to RLE.
       read98721  Read the screen of an HP 98721 "Renaissance" to an RLE file.
       repos	  Reposition an image.
       rlatorle	  Convert Wavefront RLA format to RLE.
       rleClock	  Draws a clock face.
       rleaddcom  Add comments to an RLE file.
       rleaddeof  Add an EOF code to an RLE file.
       rlebg	  Generate a "background".
       rlebox	  Find bounding box of an image.
       rlecomp	  Image composition.
       rledither  Floyd-Steinberg dither an image to a given colormap.
       rleflip	  Flip an image or rotate it 90.
       rlehdr	  Print info about an RLE file.
       rlehisto	  Make a histogram of an image.
       rleldmap	  Load a new colormap into a file.
       rlemandl	  Make a Mandelbrot image.
       rlenoise	  Add noise to an image.
       rlepatch	  Patch smaller images on a big one.
       rleprint	  Print all pixel values in image.
       rlequant	  Variance based color quantization.
       rlescale	  Generate a "gray scale".
       rleselect  Select images from an RLE file.
       rlesetbg	  Set the background color of an image file.
       rleskel	  Skeleton tool.  Programming example.
       rlespiff	  Simple contrast enhancement.
       rlesplice  Splice two images horizontally or vertically.
       rlesplit	  Split concatenated images into files.
       rlestereo  Combine two images into a "red-green" stereo pair.
       rleswap	  Swap or select color channels.
       rletoabA60 Convert RLE to Abekas A60 format.
       rletoabA62 Convert to Abekas A62 format.
       rletoascii Make a line-printer/CRT version of an RLE image.
       rletogif	  Convert RLE images to GIF format.
       rletogray  Convert RLE to separate rrr ggg bbb files.
       rletopaint Convert RLE to MacPaint.
       rletoppm	  Convert RLE to PBMPLUS ppm format.
       rletops	  Convert RLE to (B&W) PostScript.
       rletorast  Convert RLE to Sun Raster.
       rletoraw	  Convert RLE to rgbrgb raw format.
       rletorla	  Convert RLE to Wavefront RLA format.
       rletotiff  Convert RLE to TIFF 24 bit format.
       rlezoom	  Scale image by sub- or super-sampling.
       smush	  Generic filtering.
       targatorle Convert TARGA to RLE.
       tifftorle  Convert TIFF 24 bit images to RLE.
       to8	  24 to 8 bit ordered dither color conversion.
       tobw	  Color→B&W conversion.
       unexp	  Convert "exp" format to normal colors.
       unslice	  Paste together "slices" into a full image.
       wasatchrle Convert Wasatch paint system to RLE.

       The  Utah Raster Toolkit is a collection of programs and C routines for
       dealing with raster images commonly encountered in  computer  graphics.
       A device and system independent image format stores images and informa‐
       tion about them.	 Called the RLE(5) format, it uses run length encoding
       to reduce storage space for most images.

       The  programs  (tools)  currently  included  in	the toolkit are listed
       above, together with a short description of  each  one.	 Most  of  the
       tools  read one or more input RLE files and produce an output RLE file.
       Some generate RLE files from other information, and some read RLE files
       and produce output of a different form.

       An  input file is almost always specified by mentioning its name on the
       command line.  Some commands, usually those which  take	an  indefinite
       number  of  non-file  arguments	(e.g., rleaddcom) require a -i flag to
       introduce the input file name.  If the input file name  is  absent  the
       tool  will usually read from the standard input.	 An input file name of
       "-" also signals that the input	should	be  taken  from	 the  standard

       On Unix systems, there are two other specially treated file name forms.
       A file name starting with the character '|' will be passed to sh(1)  to
       run  as	a  command.   The  output from the command will be read by the
       tool.  A file whose name ends in ".Z" (and which does not begin with  a
       '|')  will  be  decompressed by the compress(1) program.	 Both of these
       options supply input to the tool through a pipe.	 Consequently, certain
       programs (those that must read their input twice) cannot take advantage
       of these features.  This is noted in the manual pages for the  affected

       An  output file is almost always specified using the option -o outfile.
       If the option is missing, or if outfile is "-", then the output will be
       written to the standard output.

       On Unix systems, the special file name forms above may also be used for
       output files.  File names starting with '|' are taken as a  command  to
       which  the  tool	 output	 will be sent.	If the file name ends in ".Z",
       then compress will be used to produce a compressed output file.

       Several images may be concatenated together into	 a  single  file,  and
       most  of	 the  tools  will properly process all the images.  Those that
       will not are noted in their respective man pages.

       Picture comments.  Images stored in RLE form  may  have	attached  com‐
       ments.  There are some comments that are interpreted, created or manip‐
       ulated by certain of the tools.	In the list below, a word enclosed  in
       <>  is  a place-holder for a value.  The <> do not appear in the actual

       image_gamma=<float number>
	      Images are sometimes computed with a particular ``gamma''	 value
	      --  that	is,  the  pixel values in the image are related to the
	      actual   intensity   by	a   power   law,    pixel_value=inten‐
	      sity^image_gamma.	   Some	 of  the  display  programs,  and  the
	      buildmap(3) function will look for this  comment	and  automati‐
	      cally build a "compensation table" to transform the pixel values
	      back to true intensity values.

       display_gamma=<float number>
	      The display_gamma is just 1/image_gamma.	That  is,  it  is  the
	      ``gamma''	 of  the display for which the image was computed.  If
	      an image_gamma comment is not present, but a  display_gamma  is,
	      the  displayed  image will be gamma corrected as above.  The to8
	      program produces a display_gamma comment.

	      The length of the colormap stored in the RLE header  must	 be  a
	      power of two.  However, the number of useful entries in the col‐
	      ormap may be smaller than this.  This comment  can  be  used  to
	      tell  some  of  the display programs (getx11, in particular) how
	      many of the colormap entries are used.  The assumption  is  that
	      entries  0  -  colormap_length-1 are used.  This comment is pro‐
	      duced by mcut, rlequant, and rledither.

	      This comment is used by getx11 to	 set  the  window  title.   If
	      present,	the  comment  is  used	instead of the file name.  (No
	      other programs currently pay attention to	 this  comment.)   The
	      comments	IMAGE_TITLE,  title, and TITLE are also recognized, in
	      that order.  No programs produce this comment.

	      All toolkit programs (with the exception of rleaddcom) create or
	      add to a HISTORY comment.	 Each tool appends a line to this com‐
	      ment that contains its command line arguments and	 the  time  it
	      was  run.	  Thus, the image contains a history of all the things
	      that were done to it.  No programs interpret this comment.

	      This comment should be present in a file	stored	in  ``exponen‐
	      tial'' form.  See unexp(1) and float_to_exp(3) for more informa‐
	      tion.  The unexp program expects to see this comment.

       compress(1), sh(1), RLE(5).

       Many people contributed to the Utah Raster Toolkit.  This  manual  page
       was written by Spencer W. Thomas, University of Michigan.

4th Berkeley Distribution	 June 17, 1990				URT(1)

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