@@ -426,7 +426,7 @@ class XDotAttrParser:

             p.append((x, y))

         return p

-    def read_color(self):

+    def read_color(self, fallback=(0,0,0,1)):

         # See http://www.graphviz.org/doc/info/attrs.html#k:color

         c = self.read_text()

         c1 = c[:1]

@@ -451,7 +451,7 @@ class XDotAttrParser:

                 color = gtk.gdk.color_parse(c)

             except ValueError:

                 sys.stderr.write("unknown color '%s'\n" % c)

-                return 1, 1, 1, 1

+                return fallback

             s = 1.0/65535.0

             r = color.red*s

             g = color.green*s

@@ -467,9 +467,9 @@ class XDotAttrParser:

         while s:

             op = s.read_code()

             if op == "c":

-                pen.color = s.read_color()

+                pen.color = s.read_color(fallback=pen.color)

             elif op == "C":

-                pen.fillcolor = s.read_color()

+                pen.fillcolor = s.read_color(fallback=pen.fillcolor)

             elif op == "S":

                 style = s.read_text()

                 if style.startswith("setlinewidth("):