XVista11 manual page

NAME

add - add image files

SYNOPSIS

add file1 [file..] [const=] [mean] [outfile=]

DESCRIPTION

This routine computes the sum of the data in file1 and (if specified) file2, or more. A constant offset can be specified. The computed sum is stored in file1.

The mean flag causes the sum to be divided by the number of files. The sum is carried as a floating point number so clipping should not be a problem until the file is written.

The number of rows and columns in file1 must equal to those in filen.

The result is placed in file1 unless the outfile= option is specified.

EXAMPLE

add alflyr gamma - adds the file gamma.fts to the file alflyr.fts

add alflyr const=45 outfile=- adds 45 to the file alflyr.fts sending the result to stdout

add gamma1 gamma2 gamma3 mean -adds files gamma2 and gamma3 to gamma1 and divides the result by 3.

SEE ALSO

sub, mul, div

Last Revised 9/24/1999.