diff --git a/ChangeLog b/ChangeLog
index 2854a5bd..adecf896 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -3,6 +3,7 @@
 - remove references to the static bicubic interpolator from the docs
 - fix temp file handling on Windows --- was breaking for non-vips files 
   over 100mb
+- better support for using images from multiple threads
 
 18/6/12 started 7.28.8
 - fixes for centos5 portability
diff --git a/libvips/include/vips/internal.h b/libvips/include/vips/internal.h
index c157f703..1496107c 100644
--- a/libvips/include/vips/internal.h
+++ b/libvips/include/vips/internal.h
@@ -83,6 +83,8 @@ extern char *vips__cache_max_files;
 extern gboolean vips__cache_dump;
 extern gboolean vips__cache_trace;
 
+void vips__cache_init( void );
+
 typedef int (*im__fftproc_fn)( VipsImage *, VipsImage *, VipsImage * );
 
 /* iofuncs
diff --git a/libvips/iofuncs/cache.c b/libvips/iofuncs/cache.c
index 1c8b1f22..d15e8bb5 100644
--- a/libvips/iofuncs/cache.c
+++ b/libvips/iofuncs/cache.c
@@ -2,6 +2,8 @@
  *
  * 20/6/12
  * 	- try to make it compile on centos5
+ * 7/7/12
+ * 	- add a lock so we can run operations from many threads
  */
 
 /*
@@ -34,9 +36,6 @@
 
    TODO
 
-	should the cache be thread-private? or lock? or say operations can 
-	only be made from the main thread?
-
 	listen for invalidate
 
 	will we need to drop all on exit? unclear
@@ -103,6 +102,10 @@ static GHashTable *vips_cache_table = NULL;
  */
 static int vips_cache_time = 0;
 
+/* Protect cache access with this.
+ */
+static GMutex *vips_cache_lock = NULL;
+
 /* Old versions of glib are missing these. When we abandon centos 5, switch to
  * g_int64_hash() and g_double_hash().
  */
@@ -403,10 +406,12 @@ vips_operation_equal( VipsOperation *a, VipsOperation *b )
 	return( FALSE );
 }
 
-static void
-vips_cache_init( void )
+void
+vips__cache_init( void )
 {
 	if( !vips_cache_table ) {
+		vips_cache_lock = g_mutex_new();
+
 		vips_cache_table = g_hash_table_new( 
 			(GHashFunc) vips_operation_hash, 
 			(GEqualFunc) vips_operation_equal );
@@ -441,11 +446,15 @@ vips_cache_dump_fn( void *value, void *a, void *b )
 static void
 vips_cache_dump( void )
 {
+	g_mutex_lock( vips_cache_lock );
+
 	if( vips_cache_table ) {
 		printf( "Operation cache:\n" );
 		vips_hash_table_map( vips_cache_table,
 			vips_cache_dump_fn, NULL, NULL );
 	}
+
+	g_mutex_unlock( vips_cache_lock );
 }
 
 static void *
@@ -523,6 +532,8 @@ vips_cache_first( void )
 void
 vips_cache_drop_all( void )
 {
+	g_mutex_lock( vips_cache_lock );
+
 	if( vips_cache_table ) {
 		VipsOperation *operation;
 
@@ -538,6 +549,8 @@ vips_cache_drop_all( void )
 
 		VIPS_FREEF( g_hash_table_unref, vips_cache_table );
 	}
+
+	g_mutex_unlock( vips_cache_lock );
 }
 
 static void
@@ -571,6 +584,8 @@ vips_cache_trim( void )
 {
 	VipsOperation *operation;
 
+	g_mutex_lock( vips_cache_lock );
+
 	while( vips_cache_table &&
 		(g_hash_table_size( vips_cache_table ) > vips_cache_max ||
 		vips_tracked_get_files() > vips_cache_max_files ||
@@ -582,6 +597,8 @@ vips_cache_trim( void )
 
 		vips_cache_drop( operation );
 	}
+
+	g_mutex_unlock( vips_cache_lock );
 }
 
 static void *
@@ -648,10 +665,10 @@ vips_cache_operation_buildp( VipsOperation **operation )
 	vips_object_print_dump( VIPS_OBJECT( *operation ) );
 #endif /*VIPS_DEBUG*/
 
-	vips_cache_init();
-
 	vips_cache_trim();
 
+	g_mutex_lock( vips_cache_lock );
+
 	if( (hit = g_hash_table_lookup( vips_cache_table, *operation )) ) {
 		if( vips__cache_trace ) {
 			printf( "vips cache: hit %p\n  ", hit );
@@ -665,7 +682,10 @@ vips_cache_operation_buildp( VipsOperation **operation )
 
 		*operation = hit;
 	}
-	else {
+
+	g_mutex_unlock( vips_cache_lock );
+
+	if( !hit ) {
 		if( vips__cache_trace ) {
 			if( (*operation)->nocache ) 
 				printf( "vips cache: uncacheable %p\n  ", 
@@ -678,11 +698,15 @@ vips_cache_operation_buildp( VipsOperation **operation )
 		if( vips_object_build( VIPS_OBJECT( *operation ) ) )
 			return( -1 );
 
+		g_mutex_lock( vips_cache_lock );
+
 		if( !(*operation)->nocache ) {
 			vips_cache_ref( *operation );
 			g_hash_table_insert( vips_cache_table, 
 				*operation, *operation );
 		}
+
+		g_mutex_unlock( vips_cache_lock );
 	}
 
 	return( 0 );
@@ -770,10 +794,17 @@ vips_cache_get_max( void )
 int
 vips_cache_get_size( void )
 {
+	guint size;
+
+	g_mutex_lock( vips_cache_lock );
+
+	size = 0;
 	if( vips_cache_table )
-		return( g_hash_table_size( vips_cache_table ) );
-	else
-		return( 0 );
+		size = g_hash_table_size( vips_cache_table );
+
+	g_mutex_unlock( vips_cache_lock );
+
+	return( size );
 }
 
 /**
diff --git a/libvips/iofuncs/generate.c b/libvips/iofuncs/generate.c
index 2a3e1d9e..3c52f757 100644
--- a/libvips/iofuncs/generate.c
+++ b/libvips/iofuncs/generate.c
@@ -50,6 +50,9 @@
  * 24/3/11
  * 	- move demand_hint stuff in here
  * 	- move to vips_ namespace
+ * 7/7/12
+ * 	- lock around link make/break so we can process an image from many
+ * 	  threads
  */
 
 /*
@@ -144,6 +147,7 @@ vips__link_break( VipsImage *image_up, VipsImage *image_down )
 {
 	g_assert( image_up );
 	g_assert( image_down );
+
 	g_assert( g_slist_find( image_up->downstream, image_down ) );
 	g_assert( g_slist_find( image_down->upstream, image_up ) );
 
@@ -167,16 +171,20 @@ vips__link_break_rev( VipsImage *image_down, VipsImage *image_up )
 	return( vips__link_break( image_up, image_down ) );
 }
 
-/* An VipsImage is going ... break all links.
+/* A VipsImage is going ... break all links.
  */
 void
 vips__link_break_all( VipsImage *image )
 {
+	g_mutex_lock( vips__global_lock );
+
 	vips_slist_map2( image->upstream, 
 		(VipsSListMap2Fn) vips__link_break, image, NULL );
 	vips_slist_map2( image->downstream, 
 		(VipsSListMap2Fn) vips__link_break_rev, image, NULL );
 
+	g_mutex_unlock( vips__global_lock );
+
 	g_assert( !image->upstream );
 	g_assert( !image->downstream );
 }
@@ -225,6 +233,8 @@ vips__link_map( VipsImage *image, VipsSListMap2Fn fn, void *a, void *b )
 	 * run the functions, and unref.
 	 */
 
+	g_mutex_lock( vips__global_lock );
+
 	serial += 1;
 	images = NULL;
 	vips__link_mapp( image, 
@@ -232,6 +242,9 @@ vips__link_map( VipsImage *image, VipsSListMap2Fn fn, void *a, void *b )
 
 	for( p = images; p; p = p->next ) 
 		g_object_ref( p->data );
+
+	g_mutex_unlock( vips__global_lock );
+
 	result = vips_slist_map2( images, fn, a, b );
 	for( p = images; p; p = p->next ) 
 		g_object_unref( p->data );
@@ -308,8 +321,10 @@ vips_demand_hint_array( VipsImage *image, VipsDemandStyle hint, VipsImage **in )
 
 	/* im depends on all these ims.
 	 */
+	g_mutex_lock( vips__global_lock );
 	for( i = 0; i < len; i++ )
 		vips__link_make( in[i], image );
+	g_mutex_unlock( vips__global_lock );
 
 	/* Set a flag on the image to say we remember to call this thing.
 	 * vips_image_generate() and friends check this.
diff --git a/libvips/iofuncs/init.c b/libvips/iofuncs/init.c
index db153192..07ab3e25 100644
--- a/libvips/iofuncs/init.c
+++ b/libvips/iofuncs/init.c
@@ -227,6 +227,8 @@ vips_init( const char *argv0 )
 	vips__interpolate_init();
 	im__format_init();
 
+	vips__cache_init();
+
 	/* Start up packages.
 	 */
 	vips_arithmetic_operation_init();
diff --git a/po/vips7.pot b/po/vips7.pot
index ea95a5e4..9ff2a50c 100644
--- a/po/vips7.pot
+++ b/po/vips7.pot
@@ -9,7 +9,7 @@ msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: http://bugzilla.gnome.org/enter_bug.cgi?"
 "product=glib&keywords=I18N+L10N&component=general\n"
-"POT-Creation-Date: 2012-07-05 12:04+0100\n"
+"POT-Creation-Date: 2012-07-09 13:07+0100\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -333,7 +333,7 @@ msgstr ""
 #: ../libvips/arithmetic/measure.c:236 ../libvips/conversion/extract.c:214
 #: ../libvips/conversion/black.c:128 ../libvips/conversion/copy.c:331
 #: ../libvips/conversion/embed.c:536 ../libvips/foreign/rawload.c:122
-#: ../libvips/iofuncs/image.c:847
+#: ../libvips/iofuncs/image.c:858
 msgid "Width"
 msgstr ""
 
@@ -344,7 +344,7 @@ msgstr ""
 #: ../libvips/arithmetic/measure.c:243 ../libvips/conversion/extract.c:221
 #: ../libvips/conversion/black.c:135 ../libvips/conversion/copy.c:338
 #: ../libvips/conversion/embed.c:543 ../libvips/foreign/rawload.c:129
-#: ../libvips/iofuncs/image.c:854
+#: ../libvips/iofuncs/image.c:865
 msgid "Height"
 msgstr ""
 
@@ -783,7 +783,7 @@ msgid "cast an image"
 msgstr ""
 
 #: ../libvips/conversion/cast.c:482 ../libvips/conversion/copy.c:352
-#: ../libvips/iofuncs/image.c:868
+#: ../libvips/iofuncs/image.c:879
 msgid "Format"
 msgstr ""
 
@@ -819,7 +819,7 @@ msgstr ""
 
 #: ../libvips/conversion/im_grid.c:164
 #: ../libvips/convolution/im_contrast_surface.c:140
-#: ../libvips/iofuncs/sinkscreen.c:1082 ../libvips/iofuncs/image.c:712
+#: ../libvips/iofuncs/sinkscreen.c:1082 ../libvips/iofuncs/image.c:710
 #: ../libvips/morphology/im_rank.c:342
 msgid "bad parameters"
 msgstr ""
@@ -887,23 +887,23 @@ msgstr ""
 
 #: ../libvips/conversion/black.c:129 ../libvips/conversion/copy.c:332
 #: ../libvips/conversion/embed.c:537 ../libvips/foreign/rawload.c:123
-#: ../libvips/iofuncs/image.c:848
+#: ../libvips/iofuncs/image.c:859
 msgid "Image width in pixels"
 msgstr ""
 
 #: ../libvips/conversion/black.c:136 ../libvips/conversion/copy.c:339
 #: ../libvips/conversion/embed.c:544 ../libvips/foreign/rawload.c:130
-#: ../libvips/iofuncs/image.c:855
+#: ../libvips/iofuncs/image.c:866
 msgid "Image height in pixels"
 msgstr ""
 
 #: ../libvips/conversion/black.c:142 ../libvips/conversion/copy.c:345
-#: ../libvips/foreign/rawload.c:136 ../libvips/iofuncs/image.c:861
+#: ../libvips/foreign/rawload.c:136 ../libvips/iofuncs/image.c:872
 msgid "Bands"
 msgstr ""
 
 #: ../libvips/conversion/black.c:143 ../libvips/conversion/copy.c:346
-#: ../libvips/foreign/rawload.c:137 ../libvips/iofuncs/image.c:862
+#: ../libvips/foreign/rawload.c:137 ../libvips/iofuncs/image.c:873
 msgid "Number of bands in image"
 msgstr ""
 
@@ -919,59 +919,59 @@ msgstr ""
 msgid "Swap bytes in image between little and big-endian"
 msgstr ""
 
-#: ../libvips/conversion/copy.c:353 ../libvips/iofuncs/image.c:869
+#: ../libvips/conversion/copy.c:353 ../libvips/iofuncs/image.c:880
 msgid "Pixel format in image"
 msgstr ""
 
-#: ../libvips/conversion/copy.c:359 ../libvips/iofuncs/image.c:875
+#: ../libvips/conversion/copy.c:359 ../libvips/iofuncs/image.c:886
 msgid "Coding"
 msgstr ""
 
-#: ../libvips/conversion/copy.c:360 ../libvips/iofuncs/image.c:876
+#: ../libvips/conversion/copy.c:360 ../libvips/iofuncs/image.c:887
 msgid "Pixel coding"
 msgstr ""
 
-#: ../libvips/conversion/copy.c:366 ../libvips/iofuncs/image.c:882
+#: ../libvips/conversion/copy.c:366 ../libvips/iofuncs/image.c:893
 msgid "Interpretation"
 msgstr ""
 
-#: ../libvips/conversion/copy.c:367 ../libvips/iofuncs/image.c:883
+#: ../libvips/conversion/copy.c:367 ../libvips/iofuncs/image.c:894
 msgid "Pixel interpretation"
 msgstr ""
 
 #: ../libvips/conversion/copy.c:373 ../libvips/foreign/tiffsave.c:251
-#: ../libvips/iofuncs/image.c:889
+#: ../libvips/iofuncs/image.c:900
 msgid "Xres"
 msgstr ""
 
 #: ../libvips/conversion/copy.c:374 ../libvips/foreign/tiffsave.c:252
-#: ../libvips/iofuncs/image.c:890
+#: ../libvips/iofuncs/image.c:901
 msgid "Horizontal resolution in pixels/mm"
 msgstr ""
 
 #: ../libvips/conversion/copy.c:380 ../libvips/foreign/tiffsave.c:258
-#: ../libvips/iofuncs/image.c:896
+#: ../libvips/iofuncs/image.c:907
 msgid "Yres"
 msgstr ""
 
 #: ../libvips/conversion/copy.c:381 ../libvips/foreign/tiffsave.c:259
-#: ../libvips/iofuncs/image.c:897
+#: ../libvips/iofuncs/image.c:908
 msgid "Vertical resolution in pixels/mm"
 msgstr ""
 
-#: ../libvips/conversion/copy.c:387 ../libvips/iofuncs/image.c:903
+#: ../libvips/conversion/copy.c:387 ../libvips/iofuncs/image.c:914
 msgid "Xoffset"
 msgstr ""
 
-#: ../libvips/conversion/copy.c:388 ../libvips/iofuncs/image.c:904
+#: ../libvips/conversion/copy.c:388 ../libvips/iofuncs/image.c:915
 msgid "Horizontal offset of origin"
 msgstr ""
 
-#: ../libvips/conversion/copy.c:394 ../libvips/iofuncs/image.c:910
+#: ../libvips/conversion/copy.c:394 ../libvips/iofuncs/image.c:921
 msgid "Yoffset"
 msgstr ""
 
-#: ../libvips/conversion/copy.c:395 ../libvips/iofuncs/image.c:911
+#: ../libvips/conversion/copy.c:395 ../libvips/iofuncs/image.c:922
 msgid "Vertical offset of origin"
 msgstr ""
 
@@ -1153,7 +1153,7 @@ msgstr ""
 msgid "command failed: \"%s\""
 msgstr ""
 
-#: ../libvips/conversion/embed.c:430 ../libvips/iofuncs/image.c:1779
+#: ../libvips/conversion/embed.c:430 ../libvips/iofuncs/image.c:1790
 msgid "bad dimensions"
 msgstr ""
 
@@ -1293,7 +1293,7 @@ msgstr ""
 #: ../libvips/foreign/jpegload.c:245 ../libvips/foreign/rawload.c:115
 #: ../libvips/foreign/matload.c:128 ../libvips/foreign/fitssave.c:128
 #: ../libvips/foreign/radsave.c:119 ../libvips/foreign/vipssave.c:125
-#: ../libvips/foreign/pngsave.c:166 ../libvips/iofuncs/image.c:917
+#: ../libvips/foreign/pngsave.c:166 ../libvips/iofuncs/image.c:928
 msgid "Filename"
 msgstr ""
 
@@ -1706,11 +1706,11 @@ msgstr ""
 msgid "load raw data from a file"
 msgstr ""
 
-#: ../libvips/foreign/rawload.c:143 ../libvips/iofuncs/image.c:945
+#: ../libvips/foreign/rawload.c:143 ../libvips/iofuncs/image.c:956
 msgid "Size of header"
 msgstr ""
 
-#: ../libvips/foreign/rawload.c:144 ../libvips/iofuncs/image.c:946
+#: ../libvips/foreign/rawload.c:144 ../libvips/iofuncs/image.c:957
 msgid "Offset in bytes from start of file"
 msgstr ""
 
@@ -1856,7 +1856,7 @@ msgid "save image to vips file"
 msgstr ""
 
 #: ../libvips/foreign/fits.c:178 ../libvips/foreign/matlab.c:106
-#: ../libvips/iofuncs/vips.c:143 ../libvips/mosaicing/global_balance.c:1181
+#: ../libvips/iofuncs/vips.c:147 ../libvips/mosaicing/global_balance.c:1181
 #: ../libvips/mosaicing/global_balance.c:1516
 #, c-format
 msgid "unable to open \"%s\""
@@ -1876,7 +1876,7 @@ msgstr ""
 msgid "unsupported bitpix %d\n"
 msgstr ""
 
-#: ../libvips/foreign/fits.c:576 ../libvips/iofuncs/vips.c:171
+#: ../libvips/foreign/fits.c:576 ../libvips/iofuncs/vips.c:175
 #, c-format
 msgid "unable to write to \"%s\""
 msgstr ""
@@ -2282,57 +2282,57 @@ msgstr ""
 msgid "write failed"
 msgstr ""
 
-#: ../libvips/iofuncs/vips.c:286
+#: ../libvips/iofuncs/vips.c:290
 #, c-format
 msgid "\"%s\" is not a VIPS image"
 msgstr ""
 
-#: ../libvips/iofuncs/vips.c:374
+#: ../libvips/iofuncs/vips.c:378
 msgid "unable to read history"
 msgstr ""
 
-#: ../libvips/iofuncs/vips.c:407
+#: ../libvips/iofuncs/vips.c:411
 msgid "more than a 10 megabytes of XML? sufferin' succotash!"
 msgstr ""
 
-#: ../libvips/iofuncs/vips.c:455
+#: ../libvips/iofuncs/vips.c:459
 msgid "incorrect namespace in XML"
 msgstr ""
 
-#: ../libvips/iofuncs/vips.c:579
+#: ../libvips/iofuncs/vips.c:583
 msgid "error transforming from save format"
 msgstr ""
 
-#: ../libvips/iofuncs/vips.c:680
+#: ../libvips/iofuncs/vips.c:684
 #, c-format
 msgid "unable to set property \"%s\" to value \"%s\"."
 msgstr ""
 
-#: ../libvips/iofuncs/vips.c:728
+#: ../libvips/iofuncs/vips.c:732
 msgid "error transforming to save format"
 msgstr ""
 
-#: ../libvips/iofuncs/vips.c:776 ../libvips/iofuncs/vips.c:973
+#: ../libvips/iofuncs/vips.c:780 ../libvips/iofuncs/vips.c:985
 #: ../libvips/iofuncs/window.c:237
 msgid "file has been truncated"
 msgstr ""
 
-#: ../libvips/iofuncs/vips.c:890 ../libvips/iofuncs/vips.c:899
-#: ../libvips/iofuncs/vips.c:922
+#: ../libvips/iofuncs/vips.c:894 ../libvips/iofuncs/vips.c:903
+#: ../libvips/iofuncs/vips.c:926
 msgid "xml save error"
 msgstr ""
 
-#: ../libvips/iofuncs/vips.c:959
+#: ../libvips/iofuncs/vips.c:971
 #, c-format
 msgid "unable to read header for \"%s\""
 msgstr ""
 
-#: ../libvips/iofuncs/vips.c:972 ../libvips/iofuncs/window.c:236
+#: ../libvips/iofuncs/vips.c:984 ../libvips/iofuncs/window.c:236
 #, c-format
 msgid "unable to read data for \"%s\", %s"
 msgstr ""
 
-#: ../libvips/iofuncs/vips.c:984
+#: ../libvips/iofuncs/vips.c:996
 #, c-format
 msgid "error reading XML: %s"
 msgstr ""
@@ -2350,7 +2350,7 @@ msgstr ""
 msgid "unknown band format %d"
 msgstr ""
 
-#: ../libvips/iofuncs/header.c:611 ../libvips/iofuncs/generate.c:343
+#: ../libvips/iofuncs/header.c:611 ../libvips/iofuncs/generate.c:358
 msgid "too many images"
 msgstr ""
 
@@ -2364,134 +2364,134 @@ msgstr ""
 msgid "field \"%s\" is of type %s, not %s"
 msgstr ""
 
-#: ../libvips/iofuncs/image.c:293
+#: ../libvips/iofuncs/image.c:290
 msgid "unable to close fd"
 msgstr ""
 
-#: ../libvips/iofuncs/image.c:373
+#: ../libvips/iofuncs/image.c:370
 #, c-format
 msgid "%dx%d %s, %d band, %s"
 msgid_plural "%dx%d %s, %d bands, %s"
 msgstr[0] ""
 msgstr[1] ""
 
-#: ../libvips/iofuncs/image.c:403
+#: ../libvips/iofuncs/image.c:400
 #, c-format
 msgid " %s, %d band, %s"
 msgid_plural " %s, %d bands, %s"
 msgstr[0] ""
 msgstr[1] ""
 
-#: ../libvips/iofuncs/image.c:531
+#: ../libvips/iofuncs/image.c:528
 #, c-format
 msgid "%s %s: %d threads, %d x %d tiles, groups of %d scanlines"
 msgstr ""
 
-#: ../libvips/iofuncs/image.c:544
+#: ../libvips/iofuncs/image.c:541
 #, c-format
 msgid "%s %s: %d%% complete"
 msgstr ""
 
 #. Spaces at end help to erase the %complete message we overwrite.
 #.
-#: ../libvips/iofuncs/image.c:561
+#: ../libvips/iofuncs/image.c:558
 #, c-format
 msgid "%s %s: done in %ds          \n"
 msgstr ""
 
-#: ../libvips/iofuncs/image.c:740
+#: ../libvips/iofuncs/image.c:738
 #, c-format
 msgid "unable to open \"%s\", file too short"
 msgstr ""
 
-#: ../libvips/iofuncs/image.c:750
+#: ../libvips/iofuncs/image.c:748
 #, c-format
 msgid "%s is longer than expected"
 msgstr ""
 
-#: ../libvips/iofuncs/image.c:767
+#: ../libvips/iofuncs/image.c:765
 #, c-format
 msgid "bad mode \"%s\""
 msgstr ""
 
-#: ../libvips/iofuncs/image.c:822
+#: ../libvips/iofuncs/image.c:832
 msgid "image class"
 msgstr ""
 
-#: ../libvips/iofuncs/image.c:918
+#: ../libvips/iofuncs/image.c:929
 msgid "Image filename"
 msgstr ""
 
-#: ../libvips/iofuncs/image.c:924
+#: ../libvips/iofuncs/image.c:935
 msgid "Mode"
 msgstr ""
 
-#: ../libvips/iofuncs/image.c:925
+#: ../libvips/iofuncs/image.c:936
 msgid "Open mode"
 msgstr ""
 
-#: ../libvips/iofuncs/image.c:931
+#: ../libvips/iofuncs/image.c:942
 msgid "Kill"
 msgstr ""
 
-#: ../libvips/iofuncs/image.c:932
+#: ../libvips/iofuncs/image.c:943
 msgid "Block evaluation on this image"
 msgstr ""
 
-#: ../libvips/iofuncs/image.c:938
+#: ../libvips/iofuncs/image.c:949
 msgid "Demand style"
 msgstr ""
 
-#: ../libvips/iofuncs/image.c:939
+#: ../libvips/iofuncs/image.c:950
 msgid "Preferred demand style for this image"
 msgstr ""
 
-#: ../libvips/iofuncs/image.c:952
+#: ../libvips/iofuncs/image.c:963
 msgid "Foreign buffer"
 msgstr ""
 
-#: ../libvips/iofuncs/image.c:953
+#: ../libvips/iofuncs/image.c:964
 msgid "Pointer to foreign pixels"
 msgstr ""
 
-#: ../libvips/iofuncs/image.c:1217
+#: ../libvips/iofuncs/image.c:1228
 #, c-format
 msgid "killed for image \"%s\""
 msgstr ""
 
-#: ../libvips/iofuncs/image.c:1817
+#: ../libvips/iofuncs/image.c:1828
 msgid "bad image descriptor"
 msgstr ""
 
-#: ../libvips/iofuncs/image.c:1875 ../libvips/iofuncs/generate.c:682
+#: ../libvips/iofuncs/image.c:1886 ../libvips/iofuncs/generate.c:697
 #, c-format
 msgid "unable to output to a %s image"
 msgstr ""
 
-#: ../libvips/iofuncs/image.c:1930
+#: ../libvips/iofuncs/image.c:1950
 #, c-format
 msgid "auto-rewind for %s failed"
 msgstr ""
 
-#: ../libvips/iofuncs/image.c:1993 ../libvips/iofuncs/image.c:2188
-#: ../libvips/iofuncs/image.c:2205
+#: ../libvips/iofuncs/image.c:2006 ../libvips/iofuncs/image.c:2201
+#: ../libvips/iofuncs/image.c:2218
 msgid "no image data"
 msgstr ""
 
-#: ../libvips/iofuncs/image.c:2061 ../libvips/iofuncs/image.c:2228
+#: ../libvips/iofuncs/image.c:2074 ../libvips/iofuncs/image.c:2241
 msgid "image not readable"
 msgstr ""
 
-#: ../libvips/iofuncs/image.c:2082 ../libvips/iofuncs/image.c:2258
-#: ../libvips/iofuncs/image.c:2267
+#: ../libvips/iofuncs/image.c:2095 ../libvips/iofuncs/image.c:2271
+#: ../libvips/iofuncs/image.c:2280
 msgid "image already written"
 msgstr ""
 
-#: ../libvips/iofuncs/image.c:2106 ../libvips/iofuncs/image.c:2279
+#: ../libvips/iofuncs/image.c:2119 ../libvips/iofuncs/image.c:2292
 msgid "image not writeable"
 msgstr ""
 
-#: ../libvips/iofuncs/image.c:2152
+#: ../libvips/iofuncs/image.c:2165
 msgid "bad file type"
 msgstr ""
 
@@ -2781,11 +2781,11 @@ msgstr ""
 msgid "too much data"
 msgstr ""
 
-#: ../libvips/iofuncs/generate.c:606
+#: ../libvips/iofuncs/generate.c:621
 msgid "demand hint not set"
 msgstr ""
 
-#: ../libvips/iofuncs/generate.c:625 ../libvips/iofuncs/generate.c:650
+#: ../libvips/iofuncs/generate.c:640 ../libvips/iofuncs/generate.c:665
 msgid "generate() called twice"
 msgstr ""
 
@@ -2841,67 +2841,67 @@ msgstr ""
 msgid "unable to mmap \"%s\" to same address"
 msgstr ""
 
-#: ../libvips/iofuncs/init.c:366
+#: ../libvips/iofuncs/init.c:368
 msgid "evaluate with N concurrent threads"
 msgstr ""
 
-#: ../libvips/iofuncs/init.c:369
+#: ../libvips/iofuncs/init.c:371
 msgid "set tile width to N (DEBUG)"
 msgstr ""
 
-#: ../libvips/iofuncs/init.c:372
+#: ../libvips/iofuncs/init.c:374
 msgid "set tile height to N (DEBUG)"
 msgstr ""
 
-#: ../libvips/iofuncs/init.c:375
+#: ../libvips/iofuncs/init.c:377
 msgid "set thinstrip height to N (DEBUG)"
 msgstr ""
 
-#: ../libvips/iofuncs/init.c:378
+#: ../libvips/iofuncs/init.c:380
 msgid "set fatstrip height to N (DEBUG)"
 msgstr ""
 
-#: ../libvips/iofuncs/init.c:381
+#: ../libvips/iofuncs/init.c:383
 msgid "show progress feedback"
 msgstr ""
 
-#: ../libvips/iofuncs/init.c:384
+#: ../libvips/iofuncs/init.c:386
 msgid "leak-check on exit"
 msgstr ""
 
-#: ../libvips/iofuncs/init.c:387
+#: ../libvips/iofuncs/init.c:389
 msgid "images larger than N are decompressed to disc"
 msgstr ""
 
-#: ../libvips/iofuncs/init.c:390
+#: ../libvips/iofuncs/init.c:392
 msgid "disable vectorised versions of operations"
 msgstr ""
 
-#: ../libvips/iofuncs/init.c:393
+#: ../libvips/iofuncs/init.c:395
 msgid "cache at most N operations"
 msgstr ""
 
-#: ../libvips/iofuncs/init.c:396
+#: ../libvips/iofuncs/init.c:398
 msgid "cache at most N bytes in memory"
 msgstr ""
 
-#: ../libvips/iofuncs/init.c:399
+#: ../libvips/iofuncs/init.c:401
 msgid "allow at most N open files"
 msgstr ""
 
-#: ../libvips/iofuncs/init.c:402
+#: ../libvips/iofuncs/init.c:404
 msgid "trace operation cache"
 msgstr ""
 
-#: ../libvips/iofuncs/init.c:405
+#: ../libvips/iofuncs/init.c:407
 msgid "dump operation cache on exit"
 msgstr ""
 
-#: ../libvips/iofuncs/init.c:428
+#: ../libvips/iofuncs/init.c:430
 msgid "VIPS Options"
 msgstr ""
 
-#: ../libvips/iofuncs/init.c:428
+#: ../libvips/iofuncs/init.c:430
 msgid "Show VIPS options"
 msgstr ""