Article View: comp.lang.postscript
Article #2600Re: How to super-impose images ?
From: Glenn Reid
Date: Tue, 24 Jul 1990 19:49
Date: Tue, 24 Jul 1990 19:49
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1255 bytes
In article <31377@eerie.acsu.Buffalo.EDU> cchang@acsu.buffalo.edu writes:
>But instead of getting the desired result, our second image
>completely overwrites the first one. Does anyone know how
>to do an OR operation on two images ?
There is no "OR" operation in PostScript, but you can probably get
the result you want by using the "imagemask" operator instead of
the "image" operator. This operator only writes the bits that
correspond to the mask you specify, which sounds like what you want.
However, it doesn't support gray-scale images, only black and white.
But that doesn't sound like a problem in your case.
/Glenn
--
Glenn Reid PostScript/NeXT consultant
glenn@heaven.woodside.ca.us Independent Software Developer
..{adobe,next}!heaven!glenn 415-851-1785
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rutgers!ucsd!sdd.hp.com!decwrl!adobe!heaven!glenn From: glenn@heaven.woodside.ca.us (Glenn Reid) Newsgroups: comp.lang.postscript Subject: Re: How to super-impose images ? Message-ID: <219@heaven.woodside.ca.us> Date: 24 Jul 90 19:49:40 GMT References: <31377@eerie.acsu.Buffalo.EDU> Reply-To: glenn@heaven.UUCP (Glenn Reid) Distribution: usa Organization: Skyline Press, Woodside CA Lines: 18