TRIPP_PROCESS_IMAGE

           Display an image (e.g. flat)
           as well as the intensity on current pointer position.
           Basic image processing is supported:
           - masking out positive disturbance found with the DAOPHOT
             package
           - performing sigma filter processing
           Also the image could be marked as being accepted/rejected.

           image : input/ 2-dimensional array of integer/floats
                   representing the image. May be changed when
                   leaving this procedure.

           TITLE  : Title text, should contain information about image.
                    Default = "Image Processing"
           minInt : minimal intensity --> 1D plot ranges, tv picture
                    default = median(image( *, ysize/2))*0.8
           maxInt : maximal intensity --> 1D plot ranges, tv picture
                    default = median(image( *, ysize/2))*1.2
           UNDEF  : Value (integer) undefined pixel are set at. Used
                    when masking out stars when processing the mask
                    (m) command. Default: -1
           SETUP  : Setup parameter record. This record contains all
                    parameter which are necessary for fine tuned image
                    processing and which therefore should remain
                    persistent for all images of a given data set. To
                    support the persistence of these parameters this
                    keyword delivers all relevant parameters to the
                    caller of this function. When not defined default
                    parameters are set.
                    Use this facility by calling this function with a
                    unused variable name, and use this variable when
                    calling again this function (for a common data set).

           NOWIN  : Do not create new window if set. This may be used
                    when calling this procedure in a sequence and
                    recreation of each window becomes tedious.

           IMAGE  : Input image with user defined modifications
                    (holes/sigma filer)
           returns: Boolean value:
                     image is accepted (1) or rejected (0),
                     or previous image should be displayed (-1)
                     (information to caller of this function).

           Version 1.0, 2001/01/10, Eckart G�hler: Initial version,
                                    as being taken from procedure
                                    tripp_display_frames.pro, version
                                    1.0. Supports displaying of image
                                    with cursor range checks, simple
                                    image processing (mask
                                    out/filtering) and accept/reject
                                    result returning.
                        2004/08/30, SLS, S.D. Huegelmeyer: yrange
                        problems in plot call fixed
                        2005/10/31, Ronny Lutz: changed X-,YTICKFORMAT

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