Date: Sat, 17 May 1997 11:38:56 +0200 From: Stefan Esser <se@FreeBSD.ORG> To: Sxren Schmidt <sos@sos.freebsd.dk> Cc: Chuck Robey <chuckr@mat.net>, dave@persprog.com, jgrosch@sirius.com, randyk@ccsales.com, freebsd-hardware@FreeBSD.ORG Subject: Re: What Printer To Get - Postscript Message-ID: <19970517113856.07573@x14.mi.uni-koeln.de> In-Reply-To: <199705162101.XAA19676@sos.freebsd.dk>; from S\xren Schmidt on Fri, May 16, 1997 at 11:01:47PM %2B0200 References: <Pine.BSF.3.91.970516140512.7298A-100000@Journey2.mat.net> <199705162101.XAA19676@sos.freebsd.dk>
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On May 16, "S\xren Schmidt" <sos@sos.freebsd.dk> wrote: > In reply to Chuck Robey who wrote: > > On Fri, 16 May 1997, Stefan Esser wrote: > > > > > 3) From what I've heard, there is no documentation about high > > > resolution graphics commands available for any HP printer. > > > The printer's manual does not even tell about the graphic > > > compression modes supported (but you can easily find them > > > by trying all of them). This limits printing to 300dpi, while > > > the actual physical resolution (pixel size on paper) appears > > > to be better, even on plain photo-copier paper (I did not yet > > > try printing on special color inkjet paper). > > > > Stefan, I thought all the inkjets used PCL5 as their language. If that's > > true, it's completely documented in stuff available from HP. > > No, the 870 uses PCL3+ whatever superset of PCL3 that might be... > I bought one a month or so ago, and it is endeed a nice printer. Well, Søren said it better than I ever could (and with less words :) The problem is, that while the HP-PCL manuals I have (from nearly ten year old HP printers) still apply, but in order to use the high-reolution graphics modes, you need undocumented ESC sequences, that appear to be common to the HP560C and newer printers. I sent the printer a PCL file meant for a 600DPI LaserJet, and it gave significantly better output than what Ghostscript had produced for a DeskJet 500. But the 600DP picture contained a few bad spots, possibly because of differences in the graphics compression algorithms supported. This should be easy to sort out, but I didn't have time, yet. > The only matter I still persue is that it prints much too colored > images, its like the color saturation has been set too high in > ghostscript. However it can probably be corrected by fiddeling > with ghostscript.... Did you try to apply Gamma correction ? There was a comment somewherei in the Ghostscript sources, that indicates the dots are too big on many ink jet printers, and I seem to remember, that a Gamam of 0.333 was suggested. I haven't tried, yet ... Regards, STefan
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