Path: utzoo!attcan!uunet!munnari!otc!softway!stephenf
From: stephenf@softway.oz (Stephen Frede)
Newsgroups: comp.lang.postscript
Subject: Re: Phototypesetter output
Summary: Also check frequency for rasters
Keywords: Linotronic, Camera ready copy
Message-ID: <449@softway.oz>
Date: 24 Jul 88 23:05:24 GMT
References: <4812@gryphon.CTS.COM> <2677@bgsuvax.UUCP>
Reply-To: stephenf@softway.oz (Stephen Frede)
Organization: Softway Pty Ltd, Sydney, Australia
Lines: 29

In article <2677@bgsuvax.UUCP> edwards@bgsuvax.UUCP (Bruce Edwards) writes:
> In article <4812@gryphon.CTS.COM>, richard@gryphon.CTS.COM (Richard Sexton) writes:
> 
> > Sheesh I thought. This is hardly better than the laser output. I can STILL
> > see the dots in the halftones.
> Even at 300dpi the Linotron output will look much better because of the
> density and consistency of the image. I don't know what resolution your
> image was printed at but we typically do our L300 output at 1270 on paper
> and only go to 2540 when we do negative film for plate production.

If you are doing raster images, or in fact anything using
halftones, as you imply, you should be aware that the default
screen frequency is 60, as in the LaserWriter. (Correct me if
I'm wrong - that was the case on a machine we had some work
printed on; it may not have been a 300). You will still
certainly see the dots in the halftones. Try increasing the
screen frequency. Of course, more small dots is not
necessarily better than less larger dots, from a normal visual
viewpoint (as opposed to close examination). Experiment with
different screen frequencies. I believe for the application we
did, we used about 100.

			Regards,

				- Stephen Frede

Softway Pty Ltd, P.O. Box 305, Strawberry Hills, NSW 2012, AUSTRALIA
Phone: +61 2 698 2322; Fax: +61 2 699 9174; Telex: AA27987
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