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+.help wtextimage Oct93 dataio
+.ih
+NAME
+wtextimage -- convert an IRAF image to a text file
+.ih
+USAGE
+wtextimage input output
+.ih
+PARAMETERS
+.ls input
+An IRAF image file name or template of file names to be converted.
+.le
+.ls output
+Name or root_name of output text file.  If more than one IRAF image
+is being converted, the ordinal of the file in the input file list
+is appended to \fIoutput\fR to generate a unique output file name.
+.le
+.ls header = yes
+This parameter determines whether or not a descriptive header precedes
+the pixels written to the text file.  When \fIheader = no\fR, only
+pixels values are converted; no header information is included in the
+output.
+.le
+.ls pixels = yes
+This parameter determines whether or not to write the pixels to the
+text file.  This can be set to no to only write out the header.
+.le
+.ls format = ""
+Output format for each pixel.  If not set by the user, the appropriate output 
+pixel format is determined by the image data type.
+Acceptable formats are chosen from "W.D[defgz]" where w is the field width and 
+d specifies the precision.  Fortran formats of the form [iefgz]W.D are also
+acceptable.  If a field width of 0 is specified, (e.g., 0.6g),
+output will be free format with each output line containing as many pixels as
+will fit on the line.  This is the most space efficient format but requires
+that the reader program be able to handle free format (list directed) input.
+.le
+.ls maxlinelen = 80
+The maximum number of characters output per line of text; \fBmaxlinelen\fR
+must not exceed 322 characters.  (Note that tasks \fIrtextimage\fR and
+\fIwcardimage\fR cannot read lines of text greater than 161 characters.)
+.le
+.ih
+DESCRIPTION
+IRAF images are converted to text files with procedure \fBwtextimage\fR.
+The text file written consists of an optional header optionally followed by
+the pixel values.  The pixels are output in FITS order, that is, the
+leftmost subscript varies most rapidly.  The image header is written in the
+"keyword = value  / comment" format of FITS.
+.ih
+EXAMPLES
+1. Write a text file from an image section of dev$pix.  The default maximum
+linelength of 80 is used; an output format is specified.  The header portion 
+of the output text is as follows:
+.ls
+.nf
+BITPIX  =                    8  /  8-bit ASCII characters
+NAXIS   =                    2  /  Number of Image Dimensions
+NAXIS1  =                   10  /  Length of axis
+NAXIS2  =                   10  /  Length of axis
+ORIGIN  = 'NOAO-IRAF: WTEXTIMAGE'  /
+IRAF-MAX=               31431.  /  Max image pixel (out of date)
+IRAF-MIN=                  33.  /  Min image pixel (out of date)
+IRAF-B/P=                   16  /  Image bits per pixel
+IRAFTYPE= 'SHORT INTEGER     '  /  Image datatype                       
+OBJECT  = 'NGC 4147 B 1800   '  /                                       
+FILENAME= 'DEV$PIX[1:10,1:10]'  /  IRAF filename                  
+FORMAT  = '11I7              '  /  Text line format
+DATA-TYP= '    object (  0 )'   / object,dark,comp,etc.
+ITIME   =                 1800  / integration time secs
+UT      = '11:23:13'            / universal time
+ZD      = '24: 5: 0'            / zenith distance
+DATE-OBS= '15/02/1985'          / dd/mm/yy observation
+ST      = '13:38:31'            / sidereal time
+RA      = '12: 9:20'            / right ascension
+DEC     = '18:35:35'            / declination
+EPOCH   =                   .0  / epoch of RA and DEC
+CAM-TEMP=              -104.95  / camera temperature, deg C
+DEW-TEMP=              -192.96  / dewar temp, deg C
+HISTORY1= 'bt=   590 bp=     0 cr=     0 dk=     0 '
+HISTORY2= 'ff=    55 fg=     0 sc=   .000  bi=   51  '
+COMMENT = 'ngc 4147 b 1800'
+F1POS   =                    2  / filter bolt I position
+F2POS   =                    0  / filter bolt II position
+END     
+.fi
+.le
+                                                                                
+2. Write a series of text files from the IRAF images having root name
+"reduced".  One text file is written for each image. 
+
+    cl> wtext reduced.* txt 
+.ih
+TIME REQUIREMENTS
+It takes almost 10 cpu minutes to convert a 512 square image of real pixels.
+A 512 square image of integer pixels takes about 3 cpu minutes.
+.ih
+SEE ALSO
+wcardimage, rtextimage, noao.onedspec.wspectext
+.endhelp