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- Newsgroups: comp.sys.next.programmer
- Path: sparky!uunet!decwrl!adobe!usenet
- From: byer@adobe.com (Scott Byer)
- Subject: Re: NeXT Step 3.0 and PostScript problems!!!!! (maybe I should get a Mac?)
- Message-ID: <1992Sep10.170046.24706@adobe.com>
- Sender: usenet@adobe.com (USENET NEWS)
- Reply-To: byer@adobe.com (Scott Byer)
- Organization: Adobe Systems Incorporated
- References: <BuCKE8.tu@news.cso.uiuc.edu>
- Date: Thu, 10 Sep 1992 17:00:46 GMT
- Lines: 44
-
- Gottfried Mayer-Kress writes
-
- > Some time I got some advertising file about why NeXT is superior to
- > Mac: because NeXT is a PostScript based machine, and therefore you
- > get on the printer "exactly" what you see on the screen, NOT! I found
- > this extremely frustrating when I tried to show off the new NextStep
- > 3.0 with PostScript "Level 2" with some simple graphics: I had a
- > perfect alignment of some elements on the screen, when I printed (even
- > on the new, fancy color printer) I got a consistent offset of about
- > 3mm, a real *&%^$-pain in the neck. This happened both in Create
- > and also in Appsoft Draw!! I really hope that I am just too dumb for
- > PostScript and someone has a nice and simple solution to this problem...
-
- This is an application level problem. Because of the lower resolution
- of the screen, Display PostScript is doing it's best to show the image
- as the application asks it to. If the application asks it to display
- a point and a line very close together, they may not show up on the
- screen as different points, but they may be far enough apart that the
- increased resolution of the printer shows the gap.
-
- Your application needs to have some concept of 'snap' - snap-to-point,
- or snap-to-line. I don't know Create or Draw, but Illustrator has
- just such a feature. By using guides and the snap-to-point feature,
- you are guarunteed that two point that claim to be aligned are aligned.
-
- A temporary solution for many programs is to zoom up the maximum amount
- and check alignment. Usually this extra zoom factor will give you
- the extra alignment you need, and hide the differences at low (300dpi)
- printer resolutions.
-
- Remember, screens have such a pitiful resolution, that it's *impossible*
- to get *exactly* WYSIWYG. The PostScript philosophy is to do the
- closest approximation to the mathematical ideal possible given the
- limits of the displaying device.
-
- Display PostScript allows applications to be device independant, not
- device ignorant.
-
- --
- Scott Byer NeXTMail: byer@mv.us.adobe.com
- Adobe Systems Incorporated These are *my* opinions, and
- 1585 Charleston Road, P.O. Box 7900 do not necessarily reflect
- Mountain View, CA 94039-7900 the opinions of my employer.
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