diff --git a/eris/eris/__main__.py b/eris/eris/__main__.py
index 1f1b9d8..b405a0d 100755
--- a/eris/eris/__main__.py
+++ b/eris/eris/__main__.py
@@ -165,14 +165,10 @@ def highlight_str(line, highlight_color, transparency):
 
     @functools.lru_cache(maxsize=500)
     def blend_style(style):
-        fg_color = (style.fg_color if type(style.fg_color) == tuple
-                    else termstr.XTERM_COLORS[style.fg_color])
-        bg_color = (style.bg_color if type(style.bg_color) == tuple
-                    else termstr.XTERM_COLORS[style.bg_color])
         return termstr.CharStyle(
-            termstr.blend_color(fg_color, highlight_color, transparency),
-            termstr.blend_color(bg_color, highlight_color, transparency), is_bold=style.is_bold,
-            is_italic=style.is_italic, is_underlined=style.is_underlined)
+            termstr.blend_color(style.fg_rgb_color, highlight_color, transparency),
+            termstr.blend_color(style.bg_rgb_color, highlight_color, transparency),
+            is_bold=style.is_bold, is_italic=style.is_italic, is_underlined=style.is_underlined)
     return termstr.TermStr(line).transform_style(blend_style)
 
 
diff --git a/termstr/termstr.py b/termstr/termstr.py
index a82e192..0d390ea 100644
--- a/termstr/termstr.py
+++ b/termstr/termstr.py
@@ -147,14 +147,20 @@ class CharStyle:
         return "".join([ESC, NORMAL, fg_termcode, bg_termcode, bold_code,
                         italic_code, underline_code])
 
+    @functools.cached_property
+    def fg_rgb_color(self):
+        return self.fg_color if type(self.fg_color) == tuple else XTERM_COLORS[self.fg_color]
+
+    @functools.cached_property
+    def bg_rgb_color(self):
+        return self.bg_color if type(self.bg_color) == tuple else XTERM_COLORS[self.bg_color]
+
     def as_html(self):
         bold_code = "font-weight:bold; " if self.is_bold else ""
         italic_code = "font-style:italic; " if self.is_italic else ""
         underline_code = "text-decoration:underline; " if self.is_underlined else ""
-        fg_color = self.fg_color if type(self.fg_color) == tuple else XTERM_COLORS[self.fg_color]
-        bg_color = self.bg_color if type(self.bg_color) == tuple else XTERM_COLORS[self.bg_color]
-        return (f"<style>.S{id(self)} {{font-size:80%%; color:rgb{fg_color!r};"
-                f" background-color:rgb{bg_color!r}; "
+        return (f"<style>.S{id(self)} {{font-size:80%%; color:rgb{self.fg_rgb_color!r};"
+                f" background-color:rgb{self.bg_rgb_color!r}; "
                 f"{bold_code}{italic_code}{underline_code}}}</style>")