diff --git a/TODO b/TODO
index 5a373313..1f149acc 100644
--- a/TODO
+++ b/TODO
@@ -1,3 +1,41 @@
+- try:
+
+#!/usr/bin/python
+
+import sys
+
+from gi.repository import Vips
+
+# we can stream the image, turn on sequential access
+#im = Vips.Image.new_from_file(sys.argv[1], access = Vips.Access.SEQUENTIAL)
+im = Vips.Image.new_from_file(sys.argv[1])
+
+text = Vips.Image.text(sys.argv[3], width = 500, dpi = 300)
+text = (text * 0.3).cast("uchar")
+text = text.embed(100, 100, text.width + 200, text.width + 200)
+text = text.replicate(1 + im.width / text.width, 1 + im.height / text.height)
+text = text.crop(0, 0, im.width, im.height)
+
+im = text.ifthenelse([255, 0, 0], im, blend = True)
+
+im.write_to_file(sys.argv[2])
+
+  makes a mono output from a colour input!
+
+	x = c.ifthenelse(a, b)
+
+  	c - mono image
+	a - vector constant
+	b - colour image
+
+  
+  
+
+
+- msb in colour should not touch alpha channel
+
+  ... or should it? should converting RGBA from 8 to 16-bit touch alpha too?
+  probably
 
 - use vips_resize() in vipsthumbnail?
 
diff --git a/test/test_colour.py b/test/test_colour.py
index 24ebc302..9ecf1887 100755
--- a/test/test_colour.py
+++ b/test/test_colour.py
@@ -135,6 +135,7 @@ class TestColour(unittest.TestCase):
 
                 before = test.getpoint(10, 10)
                 after = im3.getpoint(10, 10)
+
                 self.assertAlmostEqualObjects(before, after, places = 1)
 
         # test Lab->XYZ on mid-grey