Re: DS-RX1HS color shift when print via Gutenprint/CUPS vs Windows

Solomon Peachy <[email protected]> Sat, 18 Dec 2021 13:07:11 -0500

Newsgroups	gmane.linux.printing.gimp-print.devel
Message-ID	<[email protected]>

On Wed, Dec 08, 2021 at 09:57:28AM -0500, David Loy wrote:
> I am a relatively new owner of a DNP DS-RX1HS printer. I've been using it
> for about six months with all printing via Windows 10. Now, I am trying to
> add some automation to my workflow, and I set up a print server on a
> raspberry pi using CUPS/Gutenprint. Unfortunately, the color of the 4x6
> prints differs between Windows 10 and CUPS via raspberry pi. I'm using
> default configurations of each.

I suspect the problem here is that the version of Gutenprint you are 
using is outdated -- about two years ago we fixed a long-standing bug in 
the dyesub gamma correction code but I don't believe that this fix has 
shipped in any Raspbian OS version.

These instructions should suffice for rebuilding Gutenprint on a RPi:

  https://www.peachyphotos.com/blog/stories/building-modern-gutenprint/

 (Since you're using an RX1, you can stop after the 'service cups restart' 
  step in those instructions)

Once you have that updated version installed, make sure the 'Legacy 
Dyesub gamma curve" option is set to False (double-check in the CUPS 
user interface) -- Then the color output will be indistinguishable from 
Windows. Note that you will still need to use DNP's provided ICC profile 
with profile-aware image processing/printing flows in order to get the 
best results.

 - Solomon
-- 
Solomon Peachy			      pizza at shaftnet dot org (email&xmpp)
                                      @pizza:shaftnet dot org   (matrix)
High Springs, FL                      speachy (libra.chat)

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