diff --git a/ChangeLog b/ChangeLog
index 2d5bfec3..4f5ee6a6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -22,6 +22,8 @@
 - include sys/param.h to get PATH_MAX in more places
 - VIPS_INTERPOLATE_SHIFT bumped to 12, we need the extra precision for u16 gel
   data
+- added vips_format_get_flags()
+- oop, forgot to check for cancel during tiled tiff write
 
 11/9/08 started 7.16.3
 - oop typo in manpage for im_project()
diff --git a/TODO b/TODO
index 2669ce38..edec7a98 100644
--- a/TODO
+++ b/TODO
@@ -1,6 +1,4 @@
-- tiled tiff save won't cancel
 
-- tiled tiff im_open() seems to decompress to ram? fix before benchmarking
 
 
 - add params
diff --git a/include/vips/format.h b/include/vips/format.h
index 95e7e4d0..a376d0b3 100644
--- a/include/vips/format.h
+++ b/include/vips/format.h
@@ -110,6 +110,8 @@ void *vips_format_map( VSListMap2Fn fn, void *a, void *b );
 VipsFormatClass *vips_format_for_file( const char *filename );
 VipsFormatClass *vips_format_for_name( const char *filename );
 
+VipsFormatFlags vips_format_get_flags( VipsFormatClass *format );
+
 /* Read/write an image convenience functions.
  */
 int vips_format_read( const char *name, IMAGE *out );
diff --git a/libsrc/format/format.c b/libsrc/format/format.c
index 5941ec3a..af85b5bb 100644
--- a/libsrc/format/format.c
+++ b/libsrc/format/format.c
@@ -125,6 +125,12 @@ vips_format_init( VipsFormat *object )
 {
 }
 
+VipsFormatFlags
+vips_format_get_flags( VipsFormatClass *format )
+{
+	return( format->get_flags ? format->get_flags( filename ) : 0 );
+}
+
 /* VIPS format class.
  */
 
diff --git a/libsrc/format/im_vips2tiff.c b/libsrc/format/im_vips2tiff.c
index 7e105606..d6c3e3e6 100644
--- a/libsrc/format/im_vips2tiff.c
+++ b/libsrc/format/im_vips2tiff.c
@@ -1061,13 +1061,11 @@ write_tif_tile( TiffWrite *tw )
 			if( tw->layer && new_tile( tw->layer, tw->reg, &area ) )
 				return( -1 );
 
-			/* Trigger any eval callbacks on our source image.
+			/* Trigger any eval callbacks on our source image and
+                         * check for errors.
 			 */
-			im__handle_eval( im, area.width, area.height );
-
-                        /* Check for errors.
-                         */
-                        if( im_threadgroup_iserror( tw->tg ) ) 
+			if( im__handle_eval( im, area.width, area.height ) ||
+				im_threadgroup_iserror( tw->tg ) ) 
                                 return( -1 );
 		}