% @(#)modifycolu.hlq	17.1.1.1 (ESO-IPG) 01/25/02 17:43:44 
%++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
%.COPYRIGHT  (c)  1990 European Southern Observatory
%.IDENT      modifycolu.hlq
%.AUTHOR     KB, IPG/ESO
%.KEYWORDS   MIDAS, help files, MODIFY/COLUMN
%.PURPOSE    On-line help file for the command: MODIFY/COLUMN
%.VERSION    1.0  17-OCT-1983 : Creation, KB
%----------------------------------------------------------------
\se
SECTION./COLU
\es\co
MODIFY/COLUMN				                 09-APR-1998  KB
\oc\su
MODIFY/COLUMN source_def res_frame [col_type] [column_coords]
	approximate values in a column
\us\pu
Purpose: 
         Modify the pixels of one or two adjacent columns of an image by
         using the two columns to the left + the two columns to the right as
         "good" pixels.
\up\sy
Syntax: 
         MODIFY/COLUMN source_def res_frame [col_type] [column_coords]
\ys\pa
         source_def = defines how the columns will be defined:
\\
              (a) = inframe - use image inframe and param. `column_coords'
                    to define columns which are to be modified;
\\
              (b) = inframe,intab,collab - use image inframe and the column 
                    labeled collab of table intab to define the column_coords
\\ 
                    if only inframe,intab is given a column labeled :X is used;
\\
              defaulted to currently displayed image
\ap\pa
         res_frame = output file; defaulted to: result.bdf
\ap\pa
         col_type = type (1 char.) of column defect;
\\
              C (constant) if column values just have additional constant 
              offset and are otherwise correct, e.g. low-sensitivity columns 
              of CCDs, the adjacent columns are used to determine the correct
              offset;
\\
              V (variable) if column values are corrupted, e.g. saturated 
              columns, the new column values are obtained by approximation with
              a least-squares, second order polynomial using the adjacent 
              columns;
\\
              defaulted to C
\ap\pa
         column_coords = x-coordinates of columns, if two adjacent columns are
              to be worked on, coordinates of both have to be entered (only 
              used when no table involved)
\ap\sa
See also:
         MODIFY/ROW, MODIFY/PIXEL, MODIFY/AREA
\as\no
Note:  
         The column_coords (x-coordinates) on the command line may either be 
         given as world-coordinates or as pixel nos. preceded by the 
         character "@".
\\
         The column_coords (x-coordinates) taken from a table must be stored
         as world-coordinates.
\\
         For parameter `col_type' any character other than 'C' is interpreted
         as 'V'.
\on\exs
Examples:
\ex
         MODIFY/COLUMN gordo flaco V 53.,@100
           Approximate the column with x=53 and column no. 100 of frame 
           `gordo.bdf' and store result into frame `flaco.bdf'.
           The given columns hold no useful data.
\\
           If xworld-coord 53.0 indicates the 99th column, both adjacent 
           columns are replaced in one go, otherwise each of the two columns
           is corrected individually.
\xe\ex
         MODIFY/COLUMN gordo,feo flaco C
           Approximate the columns of frame `gordo.bdf' with x-coordinates of
           the columns to be modified stored in the column labelled :X in table
           `feo.tbl'. Store result in frame `flaco.bdf'. The given columns hold
           useful data with an unknown constant offset.
\xe\ex
         MODIFY/COLUMN gordo,feo,:x_coord flaco 
           As above but use column labeled :X_COORD of table `feo.tbl'.
\xe\sxe