seems to work

though the srgb fallback is not working

```
$ vips icc_import k2.jpg x.v --input-profile=srgb
vips__file_open_read: unable to open file "srgb" for reading
unix error: No such file or directory
icc_import: no input profile
```

perhaps padding issues?

libvips/colour/icc_transform.c

@@ -151,7 +151,9 @@ typedef struct _VipsIcc {
 	VipsPCS pcs;
 	int depth;
 
+	VipsBlob *in_blob;
 	cmsHPROFILE in_profile;
+	VipsBlob *out_blob;
 	cmsHPROFILE out_profile;
 	cmsUInt32Number in_icc_format;
 	cmsUInt32Number out_icc_format;
@@ -181,6 +183,16 @@ vips_icc_dispose( GObject *gobject )
 	VIPS_FREEF( cmsCloseProfile, icc->in_profile );
 	VIPS_FREEF( cmsCloseProfile, icc->out_profile );
 
+	if( icc->in_blob ) {
+		vips_area_unref( (VipsArea *) icc->in_blob );
+		icc->in_blob = NULL;
+	}
+
+	if( icc->out_blob ) {
+		vips_area_unref( (VipsArea *) icc->out_blob );
+		icc->out_blob = NULL;
+	}
+
 	G_OBJECT_CLASS( vips_icc_parent_class )->dispose( gobject );
 }
 
@@ -581,98 +593,72 @@ vips_image_expected_sig( VipsImage *image )
 	return( expected_sig );
 }
 
-static cmsHPROFILE
+/* Get from a filename, including loading a fallback.
-vips_icc_load_profile_image( VipsImage *image )
+ */
+static VipsBlob *
+vips_icc_get_profile_file( const char *filename )
 {
 	void *data;
-	size_t data_length;
+	size_t size;
-	cmsHPROFILE profile;
+
+	if( (data = vips__fallback_profile_get( filename, &size )) ) 
+		/* We have a fallback profile of this name.
+		 */
+		return( vips_blob_new( NULL, data, size ) );
+	else if( (data = vips__file_read_name( filename, 
+		vips__icc_dir(), &size )) )
+		/* Load from the named file. 
+		 */
+		return( vips_blob_new(
+			(VipsCallbackFn) vips_free, data, size ) );
+	else
+		return( NULL );
+}
+
+/* Get from an image.
+ */
+static VipsBlob *
+vips_icc_get_profile_image( VipsImage *image )
+{
+	void *data;
+	size_t size;
 
 	if( !vips_image_get_typeof( image, VIPS_META_ICC_NAME ) )
 		return( NULL ); 
-
+	if( vips_image_get_blob( image, VIPS_META_ICC_NAME, &data, &size ) )
-	if( vips_image_get_blob( image, VIPS_META_ICC_NAME, 
-		&data, &data_length ) ||
-		!(profile = cmsOpenProfileFromMem( data, data_length )) ) {
-		g_warning( "%s", _( "corrupt embedded profile" ) );
 		return( NULL ); 
-	}
 
-	if( vips_image_expected_bands( image ) != 
+	return( vips_blob_new( NULL, data, size ) );
-		vips_icc_profile_needs_bands( profile ) ) {
-		VIPS_FREEF( cmsCloseProfile, profile );
-		g_warning( "%s", 
-			_( "embedded profile incompatible with image" ) );
-		return( NULL );
-	}
-	if( vips_image_expected_sig( image ) != cmsGetColorSpace( profile ) ) {
-		VIPS_FREEF( cmsCloseProfile, profile );
-		g_warning( "%s", 
-			_( "embedded profile colourspace differs from image" ) );
-		return( NULL );
-	}
-
-	return( profile );
 }
 
-static void *
+/* Load a profile from a blob and check compatibility.
-vips_icc_get_profile_file( const char *filename, size_t *data_length )
-{
-	void *data;
-
-	/* See if we have a fallback profile of this name.
  */
-	if( (data = vips__fallback_profile_get( filename, data_length )) ) 
-		return( data ); 
-
-	/* Try to load as a filename.
-	 */
-	if( (data = vips__file_read_name( filename, 
-		vips__icc_dir(), data_length )) )
-		return( data ); 
-
-	return( NULL );
-}
-
-static void *
-vips_icc_get_profile_image( VipsImage *image, size_t *data_length )
-{
-	void *data;
-
-	if( !vips_image_get_typeof( image, VIPS_META_ICC_NAME ) )
-		return( NULL ); 
-
-	if( vips_image_get_blob( image, VIPS_META_ICC_NAME, 
-		&data, data_length ) _) {
-		g_warning( "%s", _( "corrupt embedded profile" ) );
-		return( NULL ); 
-	}
-
-	return( data );
-}
-
 static cmsHPROFILE
-vips_icc_load_profile( const char *domain, 
+vips_icc_load_profile_blob( VipsBlob *blob, VipsImage *image )
-	VipsImage *image, void *data, size_t *data_length )
 {
+	const void *data;
+	size_t size;
 	cmsHPROFILE profile;
 
-	if( !(profile = cmsOpenProfileFromMem( data, data_length )) ) {
+	data = vips_blob_get( blob, &size );
+	if( !(profile = cmsOpenProfileFromMem( data, size )) ) {
 		g_warning( "%s", _( "corrupt profile" ) );
 		return( NULL ); 
 	}
 
-	if( vips_image_expected_bands( image ) != 
+	if( image &&
+		vips_image_expected_bands( image ) != 
 			vips_icc_profile_needs_bands( profile ) ) {
 		VIPS_FREEF( cmsCloseProfile, profile );
-		g_warning( _( "profile \"%s\" incompatible with image" ),
+		g_warning( "%s", _( "profile incompatible with image" ) );
-			filename );
 		return( NULL );
 	}
-	if( vips_image_expected_sig( image ) != cmsGetColorSpace( profile ) ) {
+	if( image &&
+		vips_image_expected_sig( image ) != 
+			cmsGetColorSpace( profile ) ) {
 		VIPS_FREEF( cmsCloseProfile, profile );
-		g_warning( _( "profile \"%s\" colourspace "
+		g_warning( "%s", 
-			"differs from image" ), filename );
+			_( "profile colourspace differs from image" ) );
 		return( NULL );
 	}
 
@@ -695,23 +681,25 @@ vips_icc_import_build( VipsObject *object )
 	 *	1		0		image
 	 *	0		1		file
 	 *	1		1		image, then fall back to file
-	 *	
-	 * see also import_build.
 	 */
 
 	if( code->in &&
 		(import->embedded ||
 			!import->input_profile_filename) )
-		icc->in_profile = vips_icc_load_profile_image( code->in );
+		icc->in_blob = vips_icc_get_profile_image( code->in );
 
-	if( !icc->in_profile &&
+	if( !icc->in_blob &&
-		code->in &&
 		import->input_profile_filename ) {
-		icc->in_profile = vips_icc_load_profile_file( class->nickname,
+		icc->in_blob = vips_icc_get_profile_file( 
-			code->in, import->input_profile_filename );
+			import->input_profile_filename );
 	 	import->used_fallback = TRUE;
 	}
 
+	if( icc->in_blob &&
+		code->in )
+		icc->in_profile = 
+			vips_icc_load_profile_blob( icc->in_blob, code->in );
+
 	if( !icc->in_profile ) {
 		vips_error( class->nickname, "%s", _( "no input profile" ) ); 
 		return( -1 );
@@ -733,23 +721,19 @@ vips_icc_import_build( VipsObject *object )
 		return( -1 );
 
 	/* If we used the fallback profile, we need to attach it to the PCS
-	 * image since the PCS image needs to know about a route back to 
+	 * image, since the PCS image needs a route back to device space.
-	 * device space.
 	 *
 	 * In the same way, we don't remove the embedded input profile on
 	 * import.
 	 */
-	if( import->used_fallback ) {
+	if( import->used_fallback &&
-		char *data;
+		icc->in_blob ) {
-		size_t length;
+		void *data;
-
+		size_t size;
-		if( !(data = vips__file_read_name( 
-			import->input_profile_filename, 
-			vips__icc_dir(), &length )) )
-			return( -1 );
 
+		data = vips_blob_get( icc->in_blob, &size );
 		vips_image_set_blob( colour->out, VIPS_META_ICC_NAME, 
-			(VipsCallbackFn) vips_free, data, length );
+			NULL, data, size );
 	}
 
 	return( 0 );
@@ -897,32 +881,18 @@ vips_icc_export_build( VipsObject *object )
 		icc->in_profile = cmsCreateXYZProfile();
 
 	if( code->in &&
-		!export->output_profile_filename &&
+		!export->output_profile_filename )
-		vips_image_get_typeof( code->in, VIPS_META_ICC_NAME ) ) {
+		icc->out_blob = vips_icc_get_profile_image( code->in );
-		void *data;
-		size_t data_length;
 
-		if( vips_image_get_blob( code->in, VIPS_META_ICC_NAME, 
+	if( !icc->out_blob &&
-			&data, &data_length ) ||
+		export->output_profile_filename ) {
-			!(icc->out_profile = cmsOpenProfileFromMem( 
+		icc->out_blob = vips_icc_get_profile_file( 
-				data, data_length )) ) {
-			vips_error( class->nickname,
-				"%s", _( "unable to load embedded profile" ) );
-			return( -1 );
-		}
-	}
-	else if( export->output_profile_filename ) {
-		if( !(icc->out_profile = cmsOpenProfileFromFile(
-			export->output_profile_filename, "r" )) ) {
-			vips_error( class->nickname,
-				_( "unable to open profile \"%s\"" ), 
 			export->output_profile_filename );
-			return( -1 );
-		}
-
 		colour->profile_filename = export->output_profile_filename;
 	}
-	else {
+
+	if( !(icc->out_profile = 
+		vips_icc_load_profile_blob( icc->out_blob, NULL )) ) {
 		vips_error( class->nickname, "%s", _( "no output profile" ) ); 
 		return( -1 );
 	}
@@ -1115,13 +1085,17 @@ vips_icc_transform_build( VipsObject *object )
 	if( code->in &&
 		(transform->embedded ||
 			!transform->input_profile_filename) )
-		icc->in_profile = vips_icc_load_profile_image( code->in );
+		icc->in_blob = vips_icc_get_profile_image( code->in );
 
-	if( !icc->in_profile &&
+	if( !icc->in_blob &&
-		code->in &&
 		transform->input_profile_filename ) 
-		icc->in_profile = vips_icc_load_profile_file( class->nickname,
+		icc->in_blob = vips_icc_get_profile_file( 
-			code->in, transform->input_profile_filename );
+			transform->input_profile_filename );
+
+	if( icc->in_blob &&
+		code->in )
+		icc->in_profile = 
+			vips_icc_load_profile_blob( icc->in_blob, code->in );
 
 	if( !icc->in_profile ) {
 		vips_error( class->nickname, "%s", _( "no input profile" ) ); 
@@ -1129,15 +1103,18 @@ vips_icc_transform_build( VipsObject *object )
 	}
 
 	if( transform->output_profile_filename ) {
-		if( !(icc->out_profile = cmsOpenProfileFromFile(
+		icc->out_blob = vips_icc_get_profile_file( 
-			transform->output_profile_filename, "r" )) ) {
-			vips_error( class->nickname,
-				_( "unable to open profile \"%s\"" ), 
 			transform->output_profile_filename );
-			return( -1 );
+		colour->profile_filename = transform->output_profile_filename;
 	}
 
-		colour->profile_filename = transform->output_profile_filename;
+	if( icc->out_blob )
+		icc->out_profile = 
+			vips_icc_load_profile_blob( icc->out_blob, NULL );
+
+	if( !icc->out_profile ) { 
+		vips_error( class->nickname, "%s", _( "no output profile" ) ); 
+		return( -1 );
 	}
 
 	vips_check_intent( class->nickname,