44 lines
989 B
C
44 lines
989 B
C
|
/* Example showing how to call a couple of vips functions using an input
|
||
|
|
* image file and creating an output file
|
||
|
|
* also gathers some info on the input image
|
||
|
|
*/
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <vips/vips.h>
|
||
|
|
|
||
|
|
int
|
||
|
|
main( int argc, char **argv )
|
||
|
|
{
|
||
|
|
VipsImage *in;
|
||
|
|
double mean;
|
||
|
|
VipsImage *out;
|
||
|
|
|
||
|
|
if( VIPS_INIT( argv[0] ) )
|
||
|
|
vips_error_exit( NULL );
|
||
|
|
|
||
|
|
if( argc != 3 )
|
||
|
|
vips_error_exit( "usage: %s infile outfile", argv[0] );
|
||
|
|
|
||
|
|
if( !(in = vips_image_new_from_file( argv[1], NULL )) )
|
||
|
|
vips_error_exit( NULL );
|
||
|
|
|
||
|
|
printf( "image width = %d\n", vips_image_get_width( in ) );
|
||
|
|
|
||
|
|
if( vips_avg( in, &mean, NULL ) )
|
||
|
|
vips_error_exit( NULL );
|
||
|
|
|
||
|
|
printf( "mean pixel value = %g\n", mean );
|
||
|
|
|
||
|
|
/* generate photo nexative - replace with other vips_ funcs */
|
||
|
|
if( vips_invert( in, &out, NULL ) )
|
||
|
|
vips_error_exit( NULL );
|
||
|
|
|
||
|
|
g_object_unref( in );
|
||
|
|
|
||
|
|
if( vips_image_write_to_file( out, argv[2], NULL ) )
|
||
|
|
vips_error_exit( NULL );
|
||
|
|
|
||
|
|
g_object_unref( out );
|
||
|
|
|
||
|
|
return( 0 );
|
||
|
|
}
|