Created attachment 11890 [details] Same testpage, once printed with Deb6 and once with deb8 On my old system (6 years old Debian 6 + cups 1.4.4-7+squeeze5 + ghostscript 8.71~dfsg2-9+squeeze1 my zjs-printer Minolta MC2300DL is running perfectly with Rick Richardsons foo2zjs-driver from http://foo2zjs.rkkda.com/ . Now on Debian8 (with cups 1.7.5-11+deb8u1 and ghostscript 9.06~dfsg-2+deb8u1) there is too much toner on printout. Two scanned test-prints are attached. The same test page, printed once with old Debian6 and once with Debian8. The new one is darker and small letters are almost not readable. Rick wrote in an email, that this is a saturation bug occuring in Ghostscript V9 only, however not in Gs V8 (btw: Black areas on Deb-6 testpage are not correct. This is no Gs-bug but an empty toner cartridge). My question as a user: Is there a workaround possible ? Shall I replace a Gs-V9-file by a Gs-V8 file ? Or shall I replace a line in a file ? Thanks for support in advance. Thomas
Adding '-dUseFastColor' to your gs 9 command line may help you get a behavior closer to gs 8's. If that works for you, read what it does in the doc.
Hi Hin-Tak, thanks for quick answer. In Debian8 (with cups 1.7.5-11+deb8u1 and ghostscript 9.06~dfsg-2+deb8u1 I added "dUseFastColor" to /etc/cups/cupsd.conf, followed by /etc/init.d/cups/ restart. testpage-debian8_01.jpg (attached to my comment yesterday) stays unchanged. Same with "-dUseFastColor".
To be honest, I think you mis-filed this. If you had filed this under CUPS driver it would have gone to Till, who has a better chance of seeing what's wrong with the zjs driver's color. BTW, I believe the zjs driver is driven through some shell script wrapper foo2zjs-wrapper and foo2zjs-pstops, and you need to edit those. Editing cups config has not effect on the zjs driver's behavior, as far as I know.
The file /usr/bin/foo2zjs-wrapper contains a line like this: GS="$GSBIN -q -dBATCH -dSAFER -dQUIET -dNOPAUSE -dNOINTERPOLATE" Try to add "-dUseFastColor" here so that you get something like this: GS="$GSBIN -q -dBATCH -dSAFER -dQUIET -dNOPAUSE -dNOINTERPOLATE -dUseFastColor" Does this improve your printouts? Please contact the author of foo2zjs about this.
Adding dUseFasdtColor will not change anything. Saturation problems remains. Btw:-dINTERPOLATE was not part of my /usr/bin/foo2zjs-wrapper. I added (printout becomes slightly smaller) and combined with and without dUseFastColor. Saturation problem stays unchanged.I informed Rick Richardson, author of foo2zjs-driver here: http://foo2zjs.rkkda.com/forum/read.php?13,3922 Maybe he can support you solving the saturation problem.
This bug report is already near three years old. Therefore I am closing it with WONTFIX. If you are still suffering this problem please re-open.