PDFBOX-5989: more initialization of softmask processing

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1925107 13f79535-47bb-0310-9956-ffa450edef68

Author: THausherr

pdfbox/src/main/java/org/apache/pdfbox/contentstream/PDFStreamEngine.java

@@ -67,6 +67,7 @@
 import org.apache.pdfbox.contentstream.operator.OperatorName;
 import org.apache.pdfbox.contentstream.operator.OperatorProcessor;
 import org.apache.pdfbox.pdmodel.graphics.blend.BlendMode;
+import org.apache.pdfbox.pdmodel.graphics.color.PDDeviceGray;
 
 /**
  * Processes a PDF content stream and executes certain operations.
@@ -202,6 +203,10 @@ protected void processSoftMask(PDTransparencyGroup group) throws IOException
         getGraphicsState().setCurrentTransformationMatrix(softMaskCTM);
         getGraphicsState().setTextMatrix(new Matrix());
         getGraphicsState().setTextLineMatrix(new Matrix());
+        getGraphicsState().setNonStrokingColorSpace(PDDeviceGray.INSTANCE);
+        getGraphicsState().setNonStrokingColor(PDDeviceGray.INSTANCE.getInitialColor());
+        getGraphicsState().setStrokingColorSpace(PDDeviceGray.INSTANCE);
+        getGraphicsState().setStrokingColor(PDDeviceGray.INSTANCE.getInitialColor());
 
         try
         {