[Openicc] Printing Plans GhostScript / sRGB / ICC

[Graeme Gill]

Kai-Uwe Behrmann wrote:
> What is not clear to me is, how does the measurement of a uncalibrated
> driven test chart can be converted into calibration data? Would that be
> a device link profile, which contains just the channel curves for
> linearisation on top of more basic settings like density?

You can do it any way you like. Currently Argyll produces CGATS style
calibration curves, but they could be saved as device link ICC profiles
as an alternative. The latter would also cope with the per-channel
separation files too (ie. composite black to light/medium/dark black).

Graeme Gill.
>> between native device channels (light black, medium black, black)
>
> thats DeviceN
>
>> and composite device channels (light/medium/full blended into
>> a single black channel). If you don't want to have to go
>
> thats DeviceCMYK

Yes, there are ways of doing this in PS and PDF, but it would help
a lot if there was a convention about how the RIP it attached to
the printer, so that a reliable test chart could be produced
for these different calibration and profiling cases. Ideally
the end user shouldn't have to change anything about the printer
config, they should just say "print" and the different types
of test charts should be processed appropriately, because they
are marked appropriately.
(In the Colorbus RIP we used a very simple and crude mechanism -
  a "magic keyword" in the PS comments at the top of the file).

Graeme Gill.