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NAME

       im_invert - inverts an image pointed by an image descriptor.

SYNOPSIS

       #include <vips/vips.h>

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

DESCRIPTION

       im_invert  inverts the image held by image descriptor in and writes the
       result on the image descriptor out.  The  function  works  on  FMTUCHAR
       images  only.  The result at point x of the input image is 255-x at the
       output image.  Input can have any no of channels.
         This is not a generally useful  program  --  it  is  included  as  an
       example  of  a very simple new-style IO function. Feel the power of the
       source, Luke!

RETURN VALUE

       The function returns 0 on success and -1 on error.

SEE ALSO

       im_add(3), im_lintra(3), im_multiply(3).

AUTHOR

       J. Cupitt - 21/7/93

                                 11 April 1990