% @(#)modifyarea.hlq	17.1.1.1 (ESO-IPG) 01/25/02 17:43:44 
%++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
%.COPYRIGHT  (c)  1990 European Southern Observatory
%.IDENT      modifyarea.hlq
%.AUTHOR     KB, IPG/ESO
%.KEYWORDS   MIDAS, help files, MODIFY/AREA
%.PURPOSE    On-line help file for the command: MODIFY/AREA
%.VERSION    1.0  23-SEP-1988 : Creation, KB
%----------------------------------------------------------------
\se
SECTION./AREA
\es\co
MODIFY/AREA					20-OCT-1998  KB
\oc\su
MODIFY/AREA  [source] [resfram] [degree] [constant] [drawflg]
	remove bad data from a circular pixel-area in an image
\us\pu
Purpose:  
          Remove bad data from a circular pixel-area in an image.
\up\sy
Syntax:
          MODIFY/AREA  [source] [resfram] [degree] [constant] [drawflg]
\ys\pa
          source = specifies how the pixel areas we modify will be defined:
\\
               (a) CURSOR to use displayed frame + cursor rectangle to define
                   pixel areas which are to be modified
\\
               (b) frame,table[,flag] to use frame + table to define areas,
                     flag: PIXEL may be appended in order to work with frame
                     pixels otherwise world coordinates of the input frame
                     will be used - see the Notes for column labels;
\\
                     by default `flag' is omitted, i.e. we use world coords.
\\
               (c) frame  to first load that frame into the display and then
                   use the CURSOR option;
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               defaulted to CURSOR (a)
\ap\pa
          resfram = name of result frame, will be a copy of the input frame
               except for the "cleaned" areas;
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               defaulted to input frame or displayed frame
\ap\pa
          degree = degree of fitting surface (0,1 or 2); defaulted to 2
\ap\pa
          constant = constant in case of degree = 0 (otherwise not used);
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               defaulted to 0.
\ap\pa
          drawflg = 1, the cursor defined rectangle is also put into the
               overlay channel,
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               2, the modified area is loaded immediately after into the image
               display,
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               3, 1 and 2 above,
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               0, nothing of the above; 
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               defaulted to 3 for parameter `source' = (a), (c);
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               defaulted to 0 for parameter `source' = (b)
\ap\sa
See also:
          MODIFY/PIXEL, MODIFY/ROW, MODIFY/COLUMN, REPLACE/IMAGE
\as\no
Note:  
          For `source' = (a) or (c) a cursor rectangle will appear on the 
             image display.
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             Use the mouse to move the rectangle and the arrow keys to adjust
             its size. Press the ENTER button on the mouse. 
             To exit press the EXIT button.
\\
          For `source' = (b) the table columns labeled :XSTART, :XEND,
             :YSTART and :YEND containing world coords. must exist and are 
             used to define the areas.
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             If table flag is set to PIXEL then the columns labeled :XSTARTPIX,
             :XENDPIX, :YSTARTPIX and :YENDPIX containing frame pixels are 
             used, instead.
\\
             All the columns specified above are e.g. created in the command
             GET/CURSOR with table output.
\\
             For frames with a non-linear world coord-system the PIXEL option
             should be used!
\\
          All pixels inside the circle defined by the cursor_rectangle or table
          entry will be replaced by a 2-dim fitted surface.
\\
          Currently, the command is NOT working on 1-dim images.
\on\exs
Examples:
\ex
          MODIFY/AREA cursor sunshine
            Use the cursor_rectangle to define the pixel area(s) in the 
            displayed frame and put results into frame `sunshine.bdf'.
\xe\ex
          MODIFY/AREA rainbow,cloud sunshine
            Obtain from the columns :XSTART, :XEND, :YSTART and :YEND 
            of table `cloud.tbl' the world coords for area(s) of frame
            `rainbow.bdf' and put results into frame `sunshine.bdf'
\xe\ex
          MODIFY/AREA rainbow,fog,pixel sunshine
            Obtain from the columns :XSTARTPIX, :XENDPIX, :YSTARTPIX and
            :YENDPIX of table `fog.tbl' the pixel area(s) of FORS frame 
            `rainbow.bdf' (which has a non-linear world coord-sys) and put 
            results into frame `sunshine.bdf'
\xe\ex
          MODIFY/AREA rainbow hail
            Load frame `rainbow.bdf' into the image display. Then, use the
            cursor rectangle to define the pixel area(s) in the displayed 
            frame and put results into frame `hail.bdf'.
\xe \sxe