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       gpiv_combing  -  Combines two single-exposed images into one image file
       for cross-correlation.


       gpiv_combing [-a | --suf_a S] [-b | --suf_b S] [-d  |  --dt  S]  [-h  |
       --help] [-p | --print] [-s | --skip S] [-t | --type] [-u | --suf_num N]
       [-v | --version] [-V | --verbose] [-w | --warning] file_basename


       gpiv_combing combines two images from a common image  format  that  use
       lossless  compressing  schemes  into  a Portable Network Graphics image
       with extension .png. The resulting ┬┤double frame┬┤  image  is  used  for
       cross-correlation  with  gpiv_rr  (or  gpiv). Additional information is
       added to the image  header,  like  the  parameter  for  enabling  cross
       correlation,  separation  time between the recordings of the two images
       and the name of this program.

       This program uses the IMG configuration parameters. As the input images
       are  single-frame  and  will  probably  not contain the required X_corr
       parameter in its header, the IMG.X_corr setting will have to be set  to
       0 for the correct loading.

       The  default  settings may be overruled by the command line options, as
       explained below.


       -h | --help
              On-line help.

       -a | --suf_a S
              The  filename  of  the  first  image  is  generated   from   the
              file_basename,  the  suffix  S  (default: _a) and from the image
              extension type.

       -b | --suf_b S
              The  filename  of  the  second  image  is  generated  from   the
              file_basename,  the  suffix  S  (default: _b) and from the image
              extension type.

       -d | --dt S
              The time between subsequent images in  milliseconds.  The  value
              will be written to the image header. If -s | --skip is used, the
              separation time will be adapted to the correct value.

       -p | --print
              Prints parameters to stdout.

       -s | --skip S
              Skip S numbers; the first image with number N (defined by  -u  |
              --suf_num  N)  will  be  combined  with  the  second image N+S+1
              (default: S = 0)

       -t | --type
              Type or format of  the  input  image  (default  png).  Supported
              formats  are: raw binary (r), hdf5 (gpi), gif, tif, bmp and pgm.
              The format of the output image will always be png.

       -u | --suf_num N
              If images are numbered instead of having suffixes _a and  _b.  N
              represents  the  first  of the two numbered frames which will be
              combined with frame N + 1. The combined image will be  named  to
              file_basenameN.png.   So,  only odd or even numbered images will
              result to be loaded in gpiv_rr (or gpiv) for  cross-correlation.

       -v | --version
              Print   version   information  on  standard  output,  then  exit

       -V | --verbose
              Program  behaves  verbose  during   operation,   like   printing
              filenames, separation time.

       -w | --warning
              Checks  and warns if one of the two input images already contain
              an image pair, i.e. the header parameter X-corr is set TRUE. The
              program will exit if this is the case. Besides this warning, the
              program will always check if the images are of equal  sizes.  If
              an  input  image  does  not  contain the X-corr parameter in its
              header, the parameter will be read from the parameter resources.
              Not  using  this  option  allows  to  keep  the  settings in the
              parameter resources in any state.

              The filename without the image extension (like .png,  .tif  etc)
              and suffix or number.


       Suppose  two  single-exposed images will have to be combined for cross-
       correlation  with   names   image_a.gif   and   image_b.gif:   so   the
       file_basename  will  be "image", _a and _b are default suffixes and the
       image type has to be defined. The program is used following:
              gpiv_combing -t gif image

       As  PNG  is default image format, -t key is not needed. Two images with
       names turtle_slow.png and turtle_fast.png are combined with:
              gpiv_combing -a _slow -b _fast turtle

       For  two  numbered  images  img03.png  and  img04.png only the starting
       number will have to defined:
              gpiv_combing -u 3 img0

       Two numbered images img03.png and img09.png will have to be combined by
       skipping 5 images in-between. If -d |  --dt  S  is  used,  the  correct
       separation time between the combined frames is calculated from S:
              gpiv_combing -u 3 -s 5 img0

       SEE ALSO


       The program uses netpbm.


       Gerber Van der Graaf

                                31 October 2006