diff --git a/tabulate.py b/tabulate.py
index 9e91f24..b6dd0c5 100644
--- a/tabulate.py
+++ b/tabulate.py
@@ -995,7 +995,7 @@ def _format(val, valtype, floatfmt, missingval="", has_invisible=True):
         if is_a_colored_number:
             print("HIIIIII", val)
             raw_val = _strip_invisible(val)
-            formatted_val = format(Decimal(str(raw_val)), floatfmt)
+            formatted_val = format(float(val), floatfmt)
             return val.replace(raw_val, formatted_val)
         else:
             context = Context(clamp=1, prec=6)
@@ -1003,8 +1003,8 @@ def _format(val, valtype, floatfmt, missingval="", has_invisible=True):
             try:
                 if "f" in floatfmt:
                     if int(Decimal(val)) == Decimal(val):
-                        val = int(Decimal(val, context=context))
-                    val = Decimal(str(val), context=context)
+                        val = int(Decimal(val))
+                    val = Decimal(str(val))
                 else:
                     val = float(val)
             except (OverflowError, ValueError):