-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 The Friday 2004-07-02 at 09:08 +0200, Johannes Meixner wrote:
I didn't follow the whole thread in detail.
Then I'll write a brief explanation: the photos printed when using the recommended "driver", the "Canon BJC-4000 Foomatic/bjc600 (recommended)" (/usr/share/cups/model/Canon/BJC-4000-bjc600.ppd.gz) yields perfect text and some graphics, but the photographs (for example, the one on the cups test page) are horrible. It can be explained as a 16 colours or less posterize in gimp. This has been occurring since I switched to CUPS with 8.1. Text is perfect, some graphics are perfect (non dithered ones, I guess), printing is pretty fast, but photographs come out horrible. I also got an off-list email from user86, with a scanned page printed with a Canon S600 (S600-bj8pa06n.upp.ppd.gz) and the result is very similar to what I get. Er... allow me, I'll send to you just the photo part of the test page (the rest of the page is perfect), scanned at 400 dpi (printer is 360 dpi) as a 195Kb PrintTest_20040701.jpg file. I think you need to see for your self what the problem is, and I suppose you know about printing internals far better than me :-) (unfortunately, I'm unable to post that to "my" tiscali web page)
On Jul 2 02:32 Carlos E. R. wrote (shortened):
5) Only photos are printed wrong, text and other images (not dithered) are ok. Very good, in fact.
If you use the GimPrint driver isn't there an option to choose the dithering algorithm (see "lpoptions -p <queue> -l")?
Yes, I have played a bit with that using the cups configuration web page. The gimp-print gets acceptable output - very slow, though. I'll play again with that.
At least the PPDs /usr/share/cups/model/Canon/BJC-4000-gimp-print.ppd.gz
Yes, that's the one I have to use. But for quality printing, I have to go to windows, print to a file, and then go back to Linux and print raw that file. I'll try again playing with inks densities and dithering algorithms. Thank you for your interest :-) - -- Cheers, Carlos Robinson -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (GNU/Linux) Comment: Made with pgp4pine 1.76 iD8DBQFA5T8ntTMYHG2NR9URAsc1AKCNPzcoOF1a64gkHh2JTNpbtBCChgCfRaCW DO8U9+VS/u+zAkzd/i8Unj0= =r+Lh -----END PGP SIGNATURE-----