cn@allgfx.agi.oz (Con Neri) (12/17/90)
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. Thanks in advance CON NERI All Graphic R+D e-mail: cn@allgfx.agi.oz.au 49-53 Barry ST tele: +61-3-3471722 Carlton fax : +61-3-3472175 Vic 3053 AUSTRALIA
jansteen@cwi.nl (Jan van der Steen) (12/17/90)
[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