[Gimp-print-devel] Latest stuff

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

I managed to significantly reduce the amount of ink last night.  The
change wasn't all that complicated; to tell the truth, I largely
removed some old code that was duplicating what I was trying to do and
thereby increased the CMY levels too much.  Right now the old code is
still #ifdef'ed out.

It had the side effect of improving the saturation.  I did a test
print on glossy paper last night and found less banding (mostly due to
the reduced amount of ink), too.  At a saturation of 1.1, the result
is slightly more saturated, lighter (which is NOT due to the reduced
amount of ink) and a bit warmer overall than before at a saturation of
1.2.  This hasn't entirely eliminated the greenish cast on some gray
tones, but it's much better.  There are still some problems with
certain dark tones (particularly dark greens and browns) not being
perfectly smooth.

The color settings I'm using right now are all defaults except for red
of 98 (which is probably due to the ink set I'm using), saturation of
1.1, and gamma of 1.177 (which might be a touch too bright).  So it's
quite likely that default settings will actually work quite well right
now.

Also, I've renamed 1440x1440 two-pass to 1440x720 enhanced mode, which
is a more accurate description.  It also does a lot better now, and
seems to be useful to get really high quality.  Unfortunately, many of
the newer printers won't support it, so I'll have to do some work on
the Epson driver for that.

I got one report of very good quality (but less than stellar speed)
from a 900 from 3.1.3.

Could everyone go back and test their printers with the latest
repository?  In particular, could the HP and Canon folks give it a
try?  I've changed a bunch of constants, and it's possible that that
will throw off those printers.

-- 
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