Re: Equal Rights for Named Untagged (Device) Spaces!!!!!!
Re: Equal Rights for Named Untagged (Device) Spaces!!!!!!
- Subject: Re: Equal Rights for Named Untagged (Device) Spaces!!!!!!
- From: Karl Koch <email@hidden>
- Date: Wed, 26 Aug 2009 09:51:02 +0200
Hi Edmund,
I would rather advocate a "switch" that allows for printing tagged,
untagged, wrongly tagged, unknown … data without any color conversion
in the application, the OS, the driver or the RIP. This would provide
for a controlled way of printing color management targets and any
other stuff you want to print "native" for whatever reason.
I think that the application you described has nothing to do with
color management (yuck, curves ;-)) and is so exotic that there is no
need for a general mechanism in a color managed system to handle these
curves. This should be done on application level.
Best regards,
Karl
Am 25.08.2009 um 21:36 schrieb edmund ronald:
Hi Folks,
Color untagged (device) spaces are useful. As an engineer, I'm now
involved in packaging a printing backend based on CUPS/Gutenprint. If
as a print system packager or as a color consultant I load in a set of
ink-curves (C), this backend will print. In some fixed reproducible
but not colorimetrically known way. Now someone may in due course
decide to profile the effect of the set of curves (C) on a given media
on a given sample of the printer; however for engineering purposes,
the backend's behavior is totally defined as soon as the ink curves
are locked in. The only tag I really need to send to the print system
in order to reproduce this behavior is the name of the curves, namely
(C).
I hope this reasoning strikes a chord among some of the people in
charge of designing the print driver interface at Apple. Please offer
users the freedom to send untagged files to a print device, possibly
with some additional "tag name" which can be chosen to be interpreted
as a name rather than enforced as a colorimetric space.
Edmund
PS. This follows up on a private discussion with Robert Krawitz,
principal author of Gutenprint; although Robert is a much more careful
and polite man than I, he does agree there is a necessity for being
able to propagate untagged device data straight through the print
system with no "color management" applied.
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