If you have read the chapter on transparency it will be clear how to work with the CA, ca, BM, SMask graphics state parameters. (There is AIS too, but I never find that clear even after repeated rereading).
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If you have read the chapter on transparency it will be clear how to work with the CA, ca, BM, SMask graphics state parameters. (There is AIS too, but I never find that clear even after repeated rereading).