>> I presume that postscript supports transparency for both pens and brushes? >> I have a postscript greenbook somewhere IIRC, I have to find it :) > > Display PostScript (DPS) might be able to deal with it (but nobody uses > DPS since the decline and fall of SunView), but standard PostScript > doesn't---a serious fault of Adobe's which I have never been able to > understand.
I've done some more digging and found "Full Transparency From Raw PostScript" <http://www.tinaja.com/glib/pstrans2.pdf> and from my favorite Guru Lair, no less. I like many of Don's writings, and have got the green PostScript Language Program Design from him (I've finally found it on the bookshelf). Basically, any recent postscript renderer will support the /SetTransparency PDFMark operator. For devices that don't support it, we can add a blurb that approximates transparency by using an on-the-fly-generated mask. But this would be simply a matter of adding some code to the postscript output, that would define pdfmark if it's absent (perhaps on older printers). The pdfmark is documented at: <http://partners.adobe.com/public/developer/en/acrobat/sdk/pdf/pdf_creation_apis_and_specs/pdfmarkReference.pdf> Cheers, Kuba _______________________________________________ Xcircuit-dev mailing list [email protected] http://www.opencircuitdesign.com/mailman/listinfo/xcircuit-dev
