pointer to a description of how unsharp mask works

diff --git a/design/unsharp_mask.txt b/design/unsharp_mask.txt
new file mode 100644 (file)
index 0000000..8c0bf74
--- /dev/null
+++ b/design/unsharp_mask.txt
@@ -0,0 +1,3 @@
+Just a URL:
+
+http://www.photo.net/bboard/q-and-a-fetch-msg?msg_id=000Qi5