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			       ND
	ND  NDfiLT - Apply or remove nd or colour filters.
	 Program to read a neutral density (or other) filter
	 from those available on disc file and either apply
	 or remove its effect from scrunched (into lambda)
	 sad data.
	Also set up to remove 2nd order blue from 1st order
	red for AAT270R grating (tabulated in FILTER.SET)

	Filter responses tabulated in DB0:[DEVELOP.FLX]FILTER.SET
	These are listed if the user hits a  when asked for the
	filter name.
	J.O'BYRNE   JANUARY 1981
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 TYPE OPTIE                              24-SEP-1981 08:14:45.47
 >>>ND                                                                              
 OPTION ND
 OPEN INPUT FILE FOR FILTER CORRECTION
 TYPE FILENAME (<CR> FOR DEFAULT)
 FILI=SLINE
 There are   2 maps in the file       
 Reading from the file
    1 rows of 2040 pixels in R4 format
 TYPE MAPNUMBERS TO BE CORRECTED
 MAPI=1:2
 Start value increased by 1/2 channel in BINVAL
 TYPE OUTPUT MAPS(DEF=MAPI)
 MAPO=3:4
 	1:   REMOVE FILTER
 	2:   APPLY FILTER
 	3:   REMOVE BLUE LITE FROM RED
 SELECT OPTION(DEF=1)
 IOPT=1
 TYPE NAME OF FILTER REQUIRED(DEF GIVES LIST)
 NAME=AATNG0.34
 AATNG0.34	NOM DENSITY 0.34,TRANS 50%                                           
 PLOT FILTER RESPONSE ? 
 PLOT=Y			!  not unless theres a Tektronix available !
 FILTER AATNG0.34	

 INPUT MAPNUMBER     1
 Start value increased by 1/2 channel in BINVAL
 File extended to map   3

 INPUT MAPNUMBER     2
 Start value increased by 1/2 channel in BINVAL
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