diff --git a/common/plotters/PDF_plotter.cpp b/common/plotters/PDF_plotter.cpp
index cde9f51795..6286bc83e6 100644
--- a/common/plotters/PDF_plotter.cpp
+++ b/common/plotters/PDF_plotter.cpp
@@ -405,12 +405,22 @@ void PDF_PLOTTER::PlotImage( const wxImage & aImage, const wxPoint& aPos,
                 }
             }
 
+            if( aImage.HasMask() )
+            {
+                if( r == aImage.GetMaskRed() && g == aImage.GetMaskGreen() && b == aImage.GetMaskBlue() )
+                {
+                    r = 0xFF;
+                    g = 0xFF;
+                    b = 0xFF;
+                }
+            }
+
             // As usual these days, stdio buffering has to suffeeeeerrrr
             if( colorMode )
             {
-            putc( r, workFile );
-            putc( g, workFile );
-            putc( b, workFile );
+                putc( r, workFile );
+                putc( g, workFile );
+                putc( b, workFile );
             }
             else
             {
diff --git a/common/plotters/PS_plotter.cpp b/common/plotters/PS_plotter.cpp
index 537e89b280..63723f9bda 100644
--- a/common/plotters/PS_plotter.cpp
+++ b/common/plotters/PS_plotter.cpp
@@ -725,6 +725,17 @@ void PS_PLOTTER::PlotImage( const wxImage & aImage, const wxPoint& aPos,
                 }
             }
 
+            if( aImage.HasMask() )
+            {
+                if( red == aImage.GetMaskRed() && green == aImage.GetMaskGreen()
+                        && blue == aImage.GetMaskBlue() )
+                {
+                    red = 0xFF;
+                    green = 0xFF;
+                    blue = 0xFF;
+                }
+            }
+
             if( colorMode )
                 fprintf( outputFile, "%2.2X%2.2X%2.2X", red, green, blue );
             else