Re: [Gimp-print-devel] Latest stuff

[Thomas T. <tt...@bi...>]

Robert L Krawitz wrote:

> 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.

Rsuluts for the Epson Stylus Color 600 with Random Floyd-Steinberg:

Much better dark tones. Black-to-white wedge also prints a lot better,
and photos are indeed improved a lot in dark areas. Also took the time
to test 720 softweave, 1440 High Quality, 1440 Enhanced and the 2880x720
resolutions. All work, but the high resolutions have strange artefacts.
The 720 softweave, which does not show the artefacts, and the 2880x720
version, both printed with Random FLoyd Steinberg, can be found here:

http://people.a2000.nl/ztonino/dither/2880x720RandomFS.jpg
http://people.a2000.nl/ztonino/dither/720SoftweaveRandomFS.jpg

The cyan in the top right of the 720 version is a scanner problem.
Problems I see with the 2880 version:

The light wedge at the top has streks where yellow is missing (you
cannot see this with the bare eye). Under the 80 of 2880 there is a bit
of overshoot of magenta at the top, and in the top left corner at the
top there is some magenta where not other colors were printed.

The biggest issue is the face. That dark areas become very red is not
that bad, but look at the cyan line at the top right of the head that is
set just a little bit inside the hair, and the eyebrows that look like
they're painted in. Seems something is shifting around here.

The original is:

http://people.a2000.nl/ztonino/dither/me2.jpg


Thomas