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Dell C1765 Color Quality Ubuntu 14.04
Posted by: polzin ()
Date: December 02, 2014 05:49PM

1. Thanks for the amazing effords! I will make a donation.

2. With standard Ubuntu 14.04's Ghostscript the colors look really bad. With your instructions to install a 8.71 Ghostscript it works.
2.1 Positive: Your instructions for Ubuntu 11.10+ basicly works.
2.2 Negative: The mirror given in the instruction is not active any longer. http://mirror.cs.wisc.edu --> http://ghostscript.googlecode.com/files/ghostscript-8.71.tar.xz
2.3 Undecided: I had to remove "-lstdc++" from the Makefile line with EXTRALIBS

3. The pictures are now okay. Faces have a greenish unnatural color. Is it possible to improve on that?

4. Is it really a bug in GS 9+? Do you think it's possible to fix this incompatibility? I guess a lot of users will run into this problem. E.g. http://foo2zjs.rkkda.com/forum/read.php?86,3911 mentioned this color quality, but did not get a reply on that issue.

Regards,
Polzin

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Re: Dell C1765 Color Quality Ubuntu 14.04
Posted by: rickrich ()
Date: December 02, 2014 06:43PM

It is a lot of work to change the rendering engine from gs 8 to gs 9. Every single ICM has to be recomputed, in addition to the software work. Some printers I don't even have! Sorry, I don't have the time to do it.

Of course, we don't have an ICM for your printer at all. But you can contribute one. See: CUSTOM ICC/ICM COLOR PRINTER PROFILE in the INSTALL file.

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Re: Dell C1765 Color Quality Ubuntu 14.04
Posted by: prodigy7 ()
Date: January 05, 2015 12:55PM

Hi rickrich!

First: Thank you for your great work! I'm using primary linux OS at home and your lib is a great way, using the Dell C1765 printer with it!
Now, I'd made some tests and see also some quality differences between windows and linux. Not big but visible.

You wrote, you need a icm file for supporting the printer better? I looked online and found under the URL http://www.dell.com/support/home/us/en/19/Drivers/DriversDetails?driverId=103KJ the download "Dell C1765nfw Color MFP Software Suite and Drivers". When you extract the file, you'll find inside the file dlthm1z.cab (subdirectory \English\HB\Win_87VistaXP\x64\). It contains some dll's and a file dlthm1zPL.icm. I think thats the file you mean?

So far I understand right, the file only support by computing colours right.

Is there maybe also a way, enhance the driver with some options for the print resolution?

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Re: Dell C1765 Color Quality Ubuntu 14.04
Posted by: rickrich ()
Date: January 05, 2015 01:47PM

Unfortunately, that is a CMYK file. Only RGB files work with ghostscript 8.x.

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