diff --git a/scour/scour.py b/scour/scour.py
index 362180e..1a75f25 100644
--- a/scour/scour.py
+++ b/scour/scour.py
@@ -2245,6 +2245,9 @@ def convertColor(s):
     """
        Converts the input color string and returns it to the shortest known format for it.
     """
+    if s[0] == '#':
+        # Normalize #RGB into lower case early as our lookup relies on the lower case name
+        s = s.lower()
     color = colors.get(s)
     # Short cut: if we know the color (either by name or hex code) then skip the
     # parsing logic.  This makes
@@ -2255,7 +2258,6 @@ def convertColor(s):
         # If it is in #RGB/#RRGGBB format already, then we can also avoid
         # the regex parsing code.  Notably, if it is not a known hex code,
         # then at best we can truncate #RRGGBB into #RGB.
-        s = s.lower()
         if len(s) == 7 and s[1] == s[2] and s[3] == s[4] and s[5] == s[6]:
             s = '#' + s[1] + s[3] + s[5]
         return s
diff --git a/unittests/color-formats.svg b/unittests/color-formats.svg
index 7e28c7c..2889ea0 100644
--- a/unittests/color-formats.svg
+++ b/unittests/color-formats.svg
@@ -9,6 +9,6 @@
   <rect id="rect" width="100" height="100" fill="rgb(15,16,17)" stroke="darkgrey" />
   <circle id="circle" cx="100" cy="100" r="30" fill="url(#g1)" stroke="url(#c1)" />
   <ellipse id="ellipse" cx="100" cy="100" rx="30" ry="30" style="fill:#ffffff" fill="black" />
-  <rect id="short_color" width="100" height="100" fill="rgb(255,0, 0)" stroke="#ff0000" />
+  <rect id="short_color" width="100" height="100" fill="rgb(255,0, 0)" stroke="#FF0000" />
   <rect id="tied_color" width="100" height="100" fill="blue" stroke="rgb(0, 0, 255)" />
 </svg>