.TH IM_FAV4 3 "13 April 1992"
.SH NAME
im_fav4 \- averages four frames
.SH SYNOPSIS
.B #include <vips/vips.h>

.B int im_fav4(in, out)
.br
.B IMAGE **in, *out;
.SH DESCRIPTION
.B im_fav4
averages four input VIPS images, which must be unsigned byte images with any
number of bands. This is useful for noise reduction by grabbing 4 frames 
and averaging them. With 7 bit images this will give quite a convincing
eighth bit.
.SH RETURN VALUE
returns 0 on success or -1 on error
.SH SEE\ ALSO
add(1)
.SH COPYRIGHT
.br
K. Martinez 13/4/92