Reading color of stroked lines

[Joel Hirsh]

I am extending PDFGraphicsStreamEngine

and reading stroked lines.  That works fine.

I am also trying to get the color of the lines with code like

@Override
public void lineTo(float x, float y) throws IOException
{

PDGraphicsState gs = super.getGraphicsState();
int rgb = gs.getStrokingColorSpace().getInitialColor().toRGB();

or
int rgb = gs.getStrokingColor().toRGB();

}
rgb is always zero, and if I breakpoint and look at the  PDGraphicsState
structure it seems to have an infinite loop of pointers to ColorSpaces and
InitialColors.

Is there a way to read the stroke color?

What I am trying to do is ignore white on white lines.

Thanks