Re: was - P700 and P900 full channel support

I just got a P900 in-house. I gotta boot a linux machine and start cracking. . .

I’m going to assume the P900 requirements are pretty close to the P800 (2 picoliter SureColor head though so maybe close to P600) but won’t know for sure until I get at it.

Best,
Walker


> On Nov 2, 2021, at 3:00 AM, Oliver Kowalke <[email protected]> wrote:
> 
> I checked out the git repo (branch master) and I started reading "The Developer’s Guide to Gutenprint".
> Unfortunately I can not find the printers.xml as mentioned in the guide - instead ./src/xml/printers/escp2.xml contains the Epson models. Is this the correct file? Maybe the guide is not up-to-date?
> 
> In ./src/xml/printers/escp2.xml the SC-P700 and SC-P900 is not listed. Does this mean that both models are not supported yet or is it the wrong file?
> 
> 
> Am Mo., 1. Nov. 2021 um 23:47 Uhr schrieb Robert Krawitz <[email protected] <mailto:[email protected]>>:
> On 11/1/21 1:29 AM, Oliver Kowalke wrote:
> > 
> >     It should be possible to support this, other than the violet channel.  We could support the violet
> >     channel for raw printing (i. e. the user has to do the separations), but actually supporting the
> >     violet ink for normal printing would be a fair bit of tuning work and would need to be hands-on.  If
> >     you're interested in doing this, be prepared to put a lot of time and a fair bit of consumables
> >     into it.
> > 
> >     The first thing to do would be to look at src/xml/escp2/inks/cmykrb.xml in the Gutenprint source
> >     tree to see an example of what we did for the R1800 and R800, which is CMYK+red+blue (which is
> >     actually closer to purple, but Epson calls it blue).  The most non-standard part of this is the
> >     <Curves> section, which is a set of transfer curves for each ink channel by hue, starting with
> >     blue=0.  I always tested these by printing a rainbow sweep pattern and trying to get as good of a
> >     match as I could with ordinary CMY(K).
> > 
> >     My thought about this is that we should at least at first only support the violet ink in raw mode,
> >     as effectively a spot color.
> > 
> > Your description applies to the violett channel?!
> > Because I'm new to print driver development I'd like to start with supporting the matte black
> > channel. At least I think it should be easier, right?
> > What  would be your advice to start?
> 
> The channel ID for matte black will probably be the same as it is on every other printer that uses
> matte black.
> 
> 
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