diff --git a/src/image.cpp b/src/image.cpp
index 2ae65563..372d8d00 100644
--- a/src/image.cpp
+++ b/src/image.cpp
@@ -131,10 +131,10 @@ namespace {
         { ImageType::tga,  newTgaInstance,  isTgaType,  amNone,      amNone,      amNone,      amNone      },
         { ImageType::bmp,  newBmpInstance,  isBmpType,  amNone,      amNone,      amNone,      amNone      },
         { ImageType::jp2,  newJp2Instance,  isJp2Type,  amReadWrite, amReadWrite, amReadWrite, amNone      },
-        { ImageType::qtime,newQTimeInstance,isQTimeType,amReadWrite, amNone,      amNone,      amNone      },
-        { ImageType::riff, newRiffInstance, isRiffType, amReadWrite, amNone,      amNone,      amNone      },
-        { ImageType::asf,  newAsfInstance,  isAsfType,  amReadWrite, amNone,      amNone,      amNone      },
-        { ImageType::mkv,  newMkvInstance,  isMkvType,  amReadWrite, amNone,      amNone,      amNone      },
+        { ImageType::qtime,newQTimeInstance,isQTimeType,amRead,      amNone,      amRead,      amNone      },
+        { ImageType::riff, newRiffInstance, isRiffType, amRead,      amNone,      amRead,      amNone      },
+        { ImageType::asf,  newAsfInstance,  isAsfType,  amNone,      amNone,      amRead,      amNone      },
+        { ImageType::mkv,  newMkvInstance,  isMkvType,  amNone,      amNone,      amRead,      amNone      },
         // End of list marker
         { ImageType::none, 0,               0,          amNone,      amNone,      amNone,      amNone      }
     };