Add filter when image is uploaded?

I’m trying to use this code from another SO resopnse:

function ajx_sharpen_resized_files( $resized_file ) {

$image = wp_load_image( $resized_file );
if ( !is_resource( $image ) )
return new WP_Error( ‘error_loading_image’, $image, $file );

$size = @getimagesize( $resized_file );
if ( !$size )
return new WP_Error(‘invalid_image’, __(‘Could not read image size’), $file);
list($orig_w, $orig_h, $orig_type) = $size;

switch ( $orig_type ) {
case IMAGETYPE_JPEG:
$matrix = array(
array(-1, -1, -1),
array(-1, 16, -1),
array(-1, -1, -1),
);

$divisor = array_sum(array_map(‘array_sum’, $matrix));
$offset = 0;
imageconvolution($image, $matrix, $divisor, $offset);
imagejpeg($image, $resized_file,apply_filters( ‘jpeg_quality’, 90, ‘edit_image’ ));
break;
case IMAGETYPE_PNG:
return $resized_file;
case IMAGETYPE_GIF:
return $resized_file;
}

return $resized_file;
}

add_filter(‘image_make_intermediate_size’, ‘ajx_sharpen_resized_files’,900);

It works well but is only executing for when WP uses image_make_intermediate_size. Would there be a way to make this apply for every image that is uploaded?

Thanks

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