Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!mcsun!hp4nl!charon!piring.cwi.nl!jansteen From: jansteen@cwi.nl (Jan van der Steen) Newsgroups: comp.lang.postscript Subject: Re: Patterns Message-ID: Date: 17 Dec 90 10:06:25 GMT References: <1990Dec16.223249.26946@allgfx.agi.oz> Sender: news@cwi.nl Distribution: comp Lines: 85 [I tried to mail you but "cn@allgfx.agi.oz" bounced] cn@allgfx.agi.oz (Con Neri) writes: >I am trying to implement a generalised pattern fill in postscript but am having >a few problems. I am implementing a methods similar to prog 15 in the blue book >but with larger patterns. It seems that with the larger patterns the frequency >passed to the setscreen operator is ignored and some default value is used. >There are no errors generated at all and the point at which the expected >frequency and the true frequency differ is different for a different device of >the same resolution., ie > LaserWriter > LaserWriter + > DataProducts 1200 > Hyphen Software Rip (@300 dpi). >Can someone please shed some light on this phenomena? Has anybody else done >any serious work with patterns? Please either e-mail or send to this group. If >there is enough response I will summarise. (Message inbox:12) (Message inbox:12) From: MAILER-DAEMON@cwi.nl (Mail Delivery Subsystem) Subject: Returned mail: Host unknown Date: Mon, 17 Dec 90 11:04:41 +0100 To: jansteen@cwi.nl ----- Transcript of session follows ----- 554 cn@allgfx.agi.oz... 550 Host unknown (Authoritative answer from name server) ----- Unsent message follows ----- Received: by piring.cwi.nl via EUnet; Mon, 17 Dec 90 11:04:41 +0100 Date: Mon, 17 Dec 90 11:04:41 +0100 From: jansteen@cwi.nl (Jan van der Steen) Message-Id: <9012171004.AA19293@piring.cwi.nl> To: cn@allgfx.agi.oz Subject: Re: Patterns Newsgroups: comp.lang.postscript References: <1990Dec16.223249.26946@allgfx.agi.oz> In comp.lang.postscript you write: >I am trying to implement a generalised pattern fill in postscript but am having >a few problems. I am implementing a methods similar to prog 15 in the blue book >but with larger patterns. It seems that with the larger patterns the frequency >passed to the setscreen operator is ignored and some default value is used. >There are no errors generated at all and the point at which the expected >frequency and the true frequency differ is different for a different device of >the same resolution., ie > LaserWriter > LaserWriter + > DataProducts 1200 > Hyphen Software Rip (@300 dpi). >Can someone please shed some light on this phenomena? Has anybody else done >any serious work with patterns? Please either e-mail or send to this group. If >there is enough response I will summarise. The setscreen operator is *heavily* device dependant. The higher the resolution of the output device the better the results though. To get a nice overview of the capabilities of your specific output device you should obtain (please feel free to mail me) an article + testfile by Margo Schulter titled "Screen test". Jan van der Steen -- -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Jan van der Steen jansteen@cwi.nl Centre for Mathematics and Computer Science (CWI) Kruislaan 413, 1098 SJ Amsterdam, The Netherlands -- -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Jan van der Steen jansteen@cwi.nl Centre for Mathematics and Computer Science (CWI) Kruislaan 413, 1098 SJ Amsterdam, The Netherlands