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NAME

       im_andimage,    im_andconst,    im_and_vec,   im_orimage,   im_orconst,
       im_or_vec, im_eorimage, im_eorconst, im_eor_vec - boolean operations on
       unsigned char images

SYNOPSIS

       #include <vips/vips.h>

       int im_andimage(a, b, out)
       IMAGE *a, *b, *out;

       int im_andconst(a, out, c)
       IMAGE *a, *out;
       double c;

       int im_and_vec(a, out, n, v)
       IMAGE *a, *out;
       int n;
       double *v;

       int im_orimage(a, b, out)
       IMAGE *a, *b, *out;

       int im_orconst(a, out, c)
       IMAGE *a, *out;
       double c;

       int im_or_vec(a, out, n, v)
       IMAGE *a, *out;
       int n;
       double *v;

       int im_eorimage(a, b, out)
       IMAGE *a, *b, *out;

       int im_eorconst(a, out, c)
       IMAGE *a, *out;
       double c;

       int im_eor_vec(a, out, n, v)
       IMAGE *a, *out;
       int n;
       double *v;

DESCRIPTION

       Perform bitwise logical operations on integer images.

       im_andimage(3)  performs  bitwise and between corresponding pixels in a
       and b, writing the result to out.  Both images must be  the  same  size
       and have the same number of bands.  They can have any integer type.

       im_andconst(3)  performs  bitwise  and between pixels in a and a single
       constant value.  im_and_vec(3) lets you specify n  constants,  one  per
       band.

       im_orimage(3) and im_eorimage(3) behave similarly. Use im_eorconst( in,
       out, -1 ) or im_invert(3) as a not operator.

RETURN VALUE

       All functions return 0 on success and -1 on error.

SEE ALSO

       im_ifthenelse(3), im_equal(3).

COPYRIGHT

       National Gallery, 1992

AUTHOR

       J. Cupitt

                                30 October 1992