[argyllcms] Re: Accounting for dot gain in press simulation
- From: Graeme Gill <graeme@xxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Wed, 02 Mar 2011 22:52:49 +1100
Craig Ringer wrote:
It was, but I suspect that the way the press is being run now isn't as
similar to how it was run for the profile as it should be. In fact, the
profile isn't even for the same press, as they've upgraded their
equipment recently and haven't supplied a new profile.
In which case there is little chance that the profile is valid.
In any case, it seems they're not using sensor-feedback controlled ink
flow. They apparently prime the press setup with CIP3 data from the RIP,
but they play with the ink flow by hand as the press runs, using a
combination of manual solid colour densitometer (not spectro) readings
and "by eye" judgement. Needless to say, this doesn't exactly help
produce repeatable and predictable output.
Yup, that sounds like classic "old style" press operation.
One method of synchronising old style press operation with color
management that we used successfully at ColorBus, was to profile the press
under carefully controlled conditions and then to setup our proofing systems
using that profile. Copy would be proofed at the (newspaper)
editorial office using one proofer, then the sent electronically
to the press site, where there was an identical proofer. That proofer
output was used by the press operators to match the press in a more
"old fashioned" way (although I'm sure they used density measurement
and other controls as well).
I'm trying to convince them to use greybar / colour bar
measurement-driven press control for our jobs now, but I'm not sure they
even have the sensors and software to do it.
The above may be a way around that.
Nothing unusual about that. If you were using Argyll to create a proofing
device link, then I would recommend you investigate the collink -w J,a,b
option to fine tune the paper color emulation by eye.
OK, that's a very handy tip. Thanks.
It depends on whether a device link can be used in your workflow.
Graeme Gill.
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