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Hello list, hello Kai-Uwe, (Question to Mike and Till at the end !!)<br>
If we have a remote CUPS server, I would recommend, that driver
settings, ICC profiles and a PPD representing this setup are managed
centrally at the CUPS server.<br>
This is necessary to make sure, that all user working with the CUPS
server are using the same setup.<br>
As a result, only the people with admin rights for the CUPS server
are allowed to install printer ICC profiles with assignend driver
settings.<br>
<br>
As the CUPS protocol do not allow to pull ICC profiles from the
server, we have to work with the CUPS PPD dependent mechanism for
communicating the available colorsetup to the CUPS clients.<br>
<br>
Concerning the PDF print spool format, it will be easier to
implement a color managed printing path, if the PDF print spool
format transports only the profiles for describing the document
colorspace.<br>
<br>
In the print chooser (e.g. CPD), the user chooses the cupsICC
qualifiers (media, resolution) presented through the PPD, which CPS
has pulled from the CUPS remote server. On CUPS serverside, the
cupsICC qualifiers are intepreted and the printer profile for
pdftoraster is setup through through the cupsICC selection process.<br>
<br>
***********************************************<br>
Questions to Michael Sweet and Till Kamppeter<br>
***********************************************<br>
- Is this is workflow-proposal, which makes sense for a color
managed print path with remote CUPS servers from your point of view
?<br>
- If not, what are the alternatives ?<br>
<br>
Best regards<br>
Jan-Peter<br>
<br>
<br>
<br>
Am 20.05.11 09:45, schrieb Kai-Uwe Behrmann:
<blockquote
cite="mid:alpine.LNX.2.00.1105200926020.5500@roma.rasena"
type="cite">Am 19.05.11, 21:25 -0400 schrieb Robert Krawitz:
<br>
<blockquote type="cite">On Thu, 19 May 2011 15:58:57 +0200,
Jan-Peter Homann wrote:
<br>
<blockquote type="cite">
<br>
I´m not developer, but I´m working regularly together with
<br>
developers. From this experience, the manipulation of pure
ASCII
<br>
files like a PPD is not something very complicated. Is it
really a
<br>
lot of work to create e.g. a basic PPD without color relevant
<br>
entries and update the color relevant entries from profile
Divtype
<br>
metadata, which are installed on on the remote CUPS server ?
<br>
</blockquote>
</blockquote>
<br>
Does CUPS provide an API to manipulate remote PPD files?
<br>
[Please keep in mind a changed PPD will apply to all users of a
print
<br>
queue.]
<br>
<br>
Again, it makes sense to deliver a PPD with fixed settings for a
desired calibration state, add the cupsICCProfile property and
ship and install that PPD with the according ICC print profile.
Thats clearly a CUPS server thing useful for vendors like
GutenPrint and administrators as they have control of packages or
the needed access rights.
<br>
<br>
For user configured profiles that makes not much sense as Hal
already pointed out, because of the static nature of server side
installed PPDs.
<br>
<br>
<blockquote type="cite">For Gutenprint, the first part (creating
PPD files without
<br>
color-relevant entries) is no problem. The rest of it, I'll
leave to
<br>
people with more experience in that area.
<br>
<br>
(Gutenprint's PPD files are all generated based on information
in the
<br>
driver. Since we added information about which options affect
color
<br>
in 5.2.7, it would be a simple matter to generate PPD files
without
<br>
color information.)
<br>
</blockquote>
<br>
Then the defaults would apply, which appears to me different from
the driver settings that have formed the calibration state during
target printing.
<br>
<br>
kind regards
<br>
Kai-Uwe Behrmann
<br>
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