fimgtrim HEADAS help file

NAME

fimgtrim - Resets the pixels, to a constant value, whose values falls below a given low threshold and/or above a given upper threshold values.

USAGE

        fimgtrim infile threshlo threshup const_lo const_up

DESCRIPTION

FIMGTRIM resets the pixel values to a value (const_lo/const_up) if the pixel value falls below/above (threshlo/threshup). Option provided so that user can have the threshlo and/or threshup to be INDEF, in which case, it will not check for.

PARAMETERS

infile [string]

The name of the image file for statistics.

threshlo [string]

String containing the lower pixel value for calculation. Calculation is done inclusive of this value. A value of INDEF indicates that no lower limit will be used in the calculation, in which case the corresponding constant value parameter is ignored.

threshup [string]

String containing the upper pixel value for calculation. Calculation is done inclusive of this value. A value of INDEF indicates that no upper limit will be used in the calculation, in which case the corresponding constant value parameter is ignored.

const_lo [string]

Value to be reset to if the pixel value falls below threshlo.

const_up [string]

Value to be reset to if the pixel value falls above threshup.

(type= a) [string]

The type of resetting to be done, either absolute or percentage. For the initial release (April 1997), it has been kept to be absolute and later on will have option for percentage value.

outfile [string]

Output file name.

(clobber = no) [boolean])

Flag specifying whether or not a pre-existing file with the same name as that requested as the output file from this task will be overwritten.

EXAMPLES

1. To reset the pixels which falls below 2 to 0 and and above 10 to 0,

        prompt> fimgtrim infile=file.img threshlo=2 threshup=10 const_lo=0 
          const_up=0 outfile=file.out

2. To reset the pixels which falls below 2 to 0 and keep all other as they are, then

        prompt> fimgtrim infile=file.img threshlo=2 threshup=I const_lo=0 
          outfile=file.out

BUGS

None Known

LOG OF SIGNIFICANT CHANGES

V1.0 (1997 April)

PRIMARY AUTHOR

Banashree M Seifert

CONTACT FOR PROBLEM

http://heasarc.gsfc.nasa.gov/cgi-bin/ftoolshelp