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NAME

       im_fav4 - averages four frames

SYNOPSIS

       #include <vips/vips.h>

       int im_fav4(in, out)
       IMAGE **in, *out;

DESCRIPTION

       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.

RETURN VALUE

       returns 0 on success or -1 on error

SEE ALSO

       add(1)

COPYRIGHT

       K. Martinez 13/4/92

                                 13 April 1992