Re: [Gimp-print-devel] print-3.1.3/Ghost + GS 6.01 + Epson 740

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

   Date: Wed, 26 Apr 2000 23:16:05 +0200
   From: Frank van Maarseveen <F.v...@in...>

   I like the result. For photographs with pale areas the result
   is definately better than ghostscript 6.01 uniprint. Still, I
   think it could be improved.

   For epson 740, the following -dQuality has been tested:

   4  720 DPI Highest Quality		(doesn't work)
   5  1440 x 720 DPI Microweave		(doesn't work)
   6  1440 x 720 DPI Softweave		(ok)
   7  1440 x 720 DPI Highest Quality	(doesn't work)

   "doesn't work" means the printout was completely white or
   completely black, nothing in between so far.

If I remember right, none of the variable dot size printers will work
correctly with modes 4, 7, 8, or 9.  However, that's not a serious
problem; mode 6 is equivalent to mode 7 on other printers (same number
of passes).  I'm not too concerned with the microweave on that
printer, either (it's probably extremely slow).

   -dDither tested:
   0  Hybrid Floyd-Steinberg		(minor artifacts)
   2  Random Floyd-Steinberg		(good)
   4  Adaptive Random Floyd-Steinberg	(good)

   2 and 4 are practically identical.
   Common parameters: -sDEVICE=stp -dModel=12 -dDensity=0.8 -r1440 -dImageType=2

Random and adaptive random should be almost identical, except in very
light areas, where the random Floyd-Steinberg gradually switches to
ordered dithering.  Likewise hybrid and adaptive hybrid.

   In the source I saw a papersize mentioned "4x6". GS bails out at the end
   reporting that it's an unknown paper size however. Same happens for
   "Postcard".

Ghostscript may not support them, but these paper sizes do exist, and
in the form of the Gimp plugin it can certainly support them.

   An SMP enabled dithering would be nice ;-)

For ordered dithering that wouldn't be too hard, although it would
require a fair bit of reorganization.  For Floyd-Steinberg it would be
very tricky, though, because of the error feedback.

   Thanks for the good work!

You're welcome!

-- 
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