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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
# AGLT -- Given a list of ranges, replace the value of each input pixel
# which falls within a given range by applying the corresponding linear
# transformation (b = a * kmul + kadd). If KMUL is identically zero,
# B is replaced by the constant KADD.
procedure agltx (a, b, npix, low, high, kmul, kadd, nrange)
complex a[ARB], b[ARB], pixval
int npix, i
complex low[nrange], high[nrange] # range limits
real kmul[nrange], kadd[nrange]
real abs_pixval
int nrange, nr
begin
do i = 1, npix {
pixval = a[i]
b[i] = pixval
abs_pixval = abs (pixval)
do nr = 1, nrange
if (abs_pixval >= abs (low[nr]) &&
abs_pixval <= abs (high[nr])) {
if (kmul[nr] == 0.0)
b[i] = kadd[nr]
else
b[i] = (pixval * kmul[nr]) + kadd[nr]
break
}
}
end
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