/* compile with
 * gcc read.c `pkg-config vips --cflags --libs`
 */

#include <vips/vips.h>
#include <stdio.h>

int
main( int argc, char **argv )
{
    VipsImage *im;
    double d;

    VIPS_INIT( argv[0] );

    if( !(im = vips_image_new_from_file( argv[1], "fail", TRUE, NULL )) )
        vips_error_exit( NULL ); 
    if( vips_avg( im, &d, NULL ) ) {
        g_object_unref( im );
        vips_error_exit( NULL ); 
    }
    g_object_unref( im );

    printf( "avg = %g\n", d ); 

    return( 0 );
}