Detecting white text knockout

Hi all!
I have a question for you. I want to detect white text that doesn't knock out. I already detect overprinting when the text is black, and less then 12px.
Now I think by detecting white text, with OPM set to 1 and OP set to true, that's knockout, right?
The thing is, I have an PDF here that's fully GWG 1.3 certiefied, but I still detect that there is white text that doesn't knockout.
Is there an way to detect if an ExtGState is used or not? Because, if I'm searching an ExtGState that isn't used.... That's just pointless...
Can someone help me?

Sorry about that. I'm currently working on an in houde developed API, that parses an PDF. I think now were're checking for knock out to soon in the procces... How can we check if I have read all ExtGStates (and set them active if that must be done...) that there's knock out? op = true, and OPM is 1?
Of course we check fist if the text color is 0 0 0 0....

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    Message was edited by: Rayden78

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    Message was edited by: Rayden78

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