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[Jean-Marc V. <ver...@if...>]

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From: "Jean-Marc Verbavatz" <jm...@ra...>
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Date: Sun, 21 May 2000 01:02:29 +0000
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Subject: Epson 870 shot 2
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Hi,

I've been working on the epson 870 and this is my second shot. I think it's
much better than the first one.

Again, I've put my files (print.h, print-escp2.c and print-dither.c) at
"ftp://perse.saclay.cea.fr/pub/incoming/verbavatz" for testing and comments.
They're based on the version of May 18th of gimp-print. Robert, I knew you
couldn't help playing with dithering but I understand that :)

Again this will only work for epson 870s and the like.

In this version, I've fixed a few problems, worked on all of the inks again and
implemented a variable threshold for the inks as previously discussed.

I've tried colors.tif this time and it looks good to me.

I've compared the rendering with the current repository (from May 19th) and:

- it looks a lot better to me as far as grain and dithering is concerned.

- the density is much lower. This is because my color values are quite
different. I've tried to work out each of them separately so that they would
give the same output (on my printer). I think the current repository yields a
much lower gamma because values are decreasing (from darkest to lightest) much
faster than what I've done. I believe we should just set a higher density for
this printer instead.

- I've also tried printing on my old Epson Photo 700 today and for the exact
same values (where applicable) the density was much higher. Same conclusion as
above as far as I'm concerned.

- I have, from what I've seen, a better balance between light and dark inks, at
least at higher qualities, which should increase the lifetime of cartridges.

- Black (k) values may need some additional work.

Thanks for giving this another try,



-- 
--
Jean-Marc Verbavatz		<ver...@if...>
5, rue La Fontaine		"http://perso.cybercable.fr/verbavat"
F-75016 Paris