From fa080de7afc95aa1c19a6e6fc0e0708ced2eadc4 Mon Sep 17 00:00:00 2001
From: Joseph Hunkeler <jhunkeler@gmail.com>
Date: Wed, 8 Jul 2015 20:46:52 -0400
Subject: Initial commit

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 pkg/proto/doc/irafil.hlp | 106 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 pkg/proto/doc/irafil.hlp

(limited to 'pkg/proto/doc/irafil.hlp')

diff --git a/pkg/proto/doc/irafil.hlp b/pkg/proto/doc/irafil.hlp
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+.help irafil mar86 proto
+.ih
+NAME
+irafil -- converts a binary file containing pixel values to an IRAF image
+.ih
+USAGE
+irafil input nrows ncols
+.ih
+PARAMETERS
+.ls input
+the input file names to be converted
+.le
+.ls nrows
+the number of rows of data in the image
+.le
+.ls ncols
+the number of columns of data in the image
+.le
+.ls bits = 16
+the number of data bits per pixel. This must be either 8 or 16
+.le
+.ls signed = yes
+the pixels are assumed to be signed integers if the bits parameter is 16,
+and unsigned if the bits parameter is 8. If signed is set to no, then
+the 16 bit pixels will be treated as unsigned integers and the resultant
+image will be of type long integers.
+.le
+.ls tb_flip = no
+This parameter allows the image to be "top-to-bottom" flipped during
+conversion.
+.le
+.ls skip = 0
+the number of bytes to skip prior to reading pixel data. This allows
+skipping of header data which is otherwise not translatable and would
+be confused with the pixel data.
+.le
+.ih
+DESCRIPTION
+The specified files are read as integers and converted to IRAF images.
+The specified number of header bytes will be skipped, and the specified
+data format, 8 or 16 bit pixels, at the rate of ncols by nrows will be
+read. Signed data or 8 bit data will be placed into images having data
+type short. Unsigned 16 bit pixels will be converted into images of
+type long.
+
+The resultant images will be assigned the same name as the input file,
+but with ".i" appended to indicate IRAF format.
+
+The tb_flip parameter should be set to yes when converting the "snap"
+format files from the Compaq image display station, or other devices
+which refer to the first row as inverted from the usual IRAF notation.
+
+This utility is capable of converting a large number of strange
+image formats to IRAF images. By skipping any initial header, and specifying
+a value for ncols equal to either the row length of the image, or the
+number of pixels used in the foreign internal format, almost any
+16-bit format can be read. For example, FORTH pictures can be read
+by skipping the initial 2048 bytes and reading the pixels assuming
+a row length of 1024, even if the actual row length is shorter. There
+will be garbage pixels at the end of each row which can be trimmed
+with IMCOPY using picture sections. An absurd example is to read an
+IRAF pixel file by skipping 1024 bytes and reading with a row length of
+1024 [at least for the 800 pixel image I tried].
+
+Since no byte swapping is performed, a foreign tape format must be byte swapped
+if necessary prior to using IRAFIL. This may be done with REBLOCK in the
+dataio package.
+.ih
+EXAMPLES
+
+1. Say you've deleted your header file to an IRAF image. The pixel file
+is pix3034x. Assuming the pixels are short integers, the image is
+10 rows by 800 columns:
+
+.nj
+.nf
+lo> irafil pix3034x 10 1024 skip=1024
+lo> imcopy pix3034x.i[1:800,*] phoenix
+.fi
+.ju
+
+The first line creates the IRAF image pix3034x.i which is readable
+by IRAF tasks, but has 1024 pixels per row. The real image only
+has 800 pixels per row, but we had to read it this way because of the
+way pixels are stored in IRAF images. So we IMCOPY the good part of
+the picture to the new IRAF image we call phoenix.
+
+2. To read the "snap" format pictures from the Compaq station:
+
+.nj
+.nf
+lo> irafil m82.snp 512 512 tb_flip+ bits=8
+.fi
+.ju
+
+This will create the IRAF image m82.snp.i which can then be run
+through CRTPICT to make a Dicomed hardcopy.
+.ih
+TIME REQUIREMENTS
+.ih
+BUGS
+There is no way to explicitly specify the output image name.
+.ih
+SEE ALSO
+binfil,imcopy,reblock
+.endhelp
-- 
cgit 

