diff -ur VTK.orig/IO/vtkBMPReader.cxx VTK/IO/vtkBMPReader.cxx
--- VTK.orig/IO/vtkBMPReader.cxx	2006-02-15 21:21:48.000000000 +0100
+++ VTK/IO/vtkBMPReader.cxx	2006-02-15 21:23:52.000000000 +0100
@@ -496,11 +496,11 @@
         outPtr0 += outIncr[0];
         }
       // move to the next row in the file and data
-      self->GetFile()->seekg(static_cast<long>(self->GetFile()->tellg()) + streamSkip0, ios::beg);
+      self->GetFile()->seekg(static_cast<long>(self->GetFile()->tellg()) + (ios::pos_type)streamSkip0, ios::beg);
       outPtr1 += outIncr[1];
       }
     // move to the next image in the file and data
-    self->GetFile()->seekg(static_cast<long>(self->GetFile()->tellg()) + streamSkip1, ios::beg);
+    self->GetFile()->seekg(static_cast<long>(self->GetFile()->tellg()) + (ios::pos_type)streamSkip1, ios::beg);
     outPtr2 += outIncr[2];
     }
 
diff -ur VTK.orig/IO/vtkImageReader.cxx VTK/IO/vtkImageReader.cxx
--- VTK.orig/IO/vtkImageReader.cxx	2006-02-15 21:21:47.000000000 +0100
+++ VTK/IO/vtkImageReader.cxx	2006-02-15 21:24:19.000000000 +0100
@@ -376,7 +376,7 @@
       // if that happens, store the value in correction and apply later
       if (filePos + streamSkip0 >= 0)
         {
-        self->GetFile()->seekg(static_cast<long>(self->GetFile()->tellg()) + streamSkip0, ios::beg);
+        self->GetFile()->seekg(static_cast<long>(self->GetFile()->tellg()) + (ios::pos_type)streamSkip0, ios::beg);
         correction = 0;
         }
       else
@@ -386,7 +386,7 @@
       outPtr1 += outIncr[1];
       }
     // move to the next image in the file and data
-    self->GetFile()->seekg(static_cast<long>(self->GetFile()->tellg()) + streamSkip1 + correction, 
+    self->GetFile()->seekg(static_cast<long>(self->GetFile()->tellg()) + (ios::pos_type)streamSkip1 + correction, 
                       ios::beg);
     outPtr2 += outIncr[2];
     }