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c MINMAX -- Compute the minimum and maximum pixel values in an image.
c The new values are printed as well as updated in the image header.
c
c usage: minmax image
c ----------------------------------------------------------------------
program minmax
character*80 image, errmsg
real pix(8192), dmin, dmax, vmin, vmax
integer im, axlen(7), naxis, dtype, ier, j
c --- Get image name.
call clargc (1, image, ier)
if (ier .ne. 0) then
write (*, '('' enter image name: '',$)')
read (*,*) image
endif
c --- Open the image for readwrite access (we need to update the header).
call imopen (image, 3, im, ier)
if (ier .ne. 0) goto 91
call imgsiz (im, axlen, naxis, dtype, ier)
if (ier .ne. 0) goto 91
c --- Read through the image and compute the limiting pixel values.
do 10 j = 1, axlen(2)
call imgl2r (im, pix, j, ier)
if (ier .ne. 0) goto 91
call alimr (pix, axlen(1), vmin, vmax)
if (j .eq. 1) then
dmin = vmin
dmax = vmax
else
dmin = min (dmin, vmin)
dmax = max (dmax, vmax)
endif
10 continue
c --- Update the image header.
call impkwr (im, 'datamin', dmin, ier)
if (ier .ne. 0) goto 91
call impkwr (im, 'datamax', dmax, ier)
if (ier .ne. 0) goto 91
c --- Clean up.
call imclos (im, ier)
if (ier .ne. 0) goto 91
write (*, '(1x, a20, 2 g12.5)') image, dmin, dmax
stop
c --- Error exit.
91 call imemsg (ier, errmsg)
write (*, '('' Error: '', a80)') errmsg
stop
end
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