Re: [Gimp-print-devel] stylus 660, gs 6.01

[Robert L K. <rl...@al...>]

   Date: Sun, 23 Apr 2000 21:54:13 +0200
   From: Hrafnkell Eiriksson <he...@kv...>

   Hi

   On Sun, Apr 23, 2000 at 01:34:18PM -0400, Karl Heinz Kremer wrote:
   > > Could I find something out by taking the output from the windows
   > > or printpro driver and try to parse that into escp2 commands?
   > 
   > You can use the unprint command to "dis-assemble" the ESC/P2 code.

   hmm.. It just coredumped :) Also on the ghostscript output.  I went
   through the output from the windows driver when letting in print in
   360dpi and the output looked very much like what the print-escp2.c
   driver should generate (some differences though).  Do we have
   access anywhere to documentation on the commands used in REMOTE
   mode?

We don't have any doc on the Remote mode stuff.  I don't think that
that affects printing very much.  Could you take the first 200 or so
lines of output from parse-escp2 run on the Windows output and send
that to me?  That would help tremendously.

   I used hybrid floyd steinberg dithering and in both cases
   the image looked veeerrry grainy and way to bright.
   I was printing a photograph of me and around my head I could
   see strange artifacts, like a outline drawed around it.
   I have dark hair and the background is white. It looks like
   the quantization error is being diffused in a very regular manner
   to those pixels (it is a mix between floyd steinberg and ordered 
   dithering?).

Try using random Floyd-Steinberg and ordered, and then try the
adaptive modes.  Yes, the hybrid Floyd-Steinberg is using partially
ordered dithering and partially error diffusion.

   Hmm I just checked.. this effect is even worse when using ordinary
   floyd steinberg with 720dpi microweave. 
   Now it looks like an edge-detect filter is
   used on the image first, then the edges are shifted from their
   correct place and added to the image and then it is printed.
   The printout is also very bright (brightness setting 100 in 
   adjust color).

What's the density and gamma set to?

-- 
Robert Krawitz <rl...@al...>      http://www.tiac.net/users/rlk/

Tall Clubs International  --  http://www.tall.org/ or 1-888-IM-TALL-2
Member of the League for Programming Freedom -- mail lp...@uu...
Project lead for The Gimp Print --  http://gimp-print.sourceforge.net

"Linux doesn't dictate how I work, I dictate how Linux works."
--Eric Crampton