Workflow for ‘remote’ profiling a non-colormanaged printer as a ‘back-box’
Workflow for ‘remote’ profiling a non-colormanaged printer as a ‘back-box’
- Subject: Workflow for ‘remote’ profiling a non-colormanaged printer as a ‘back-box’
- From: "Miles, Peter via colorsync-users" <email@hidden>
- Date: Thu, 15 Jul 2021 01:45:08 +0000
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- Thread-topic: Workflow for ‘remote’ profiling a non-colormanaged printer as a ‘back-box’
Hi color sync users.
This is a question about my workflow for ‘remote’ profiling a non-colormanaged
printer as a ‘back-box’.
And if you can see any obvious mistakes in my workflow / thinking.
One of our staff is using an external non-colormanaged print provider. And I'm
wanting to help him prepare work for it. Test prints to this printer are in
AdobeRGB1998 and prints come out over saturated.
So I am attempting to profile the print process ‘remotely’ using i1 profiler.
And to do the color conversion ourselves.
I am familiar with profiling inkjet and laser printers where I work using
i1Profiler, FieryXF and ColorBurstRIP.
I thought it would be a fairly straight forward process, but I’m getting some
unexpected results.
I am not in a position to control this external printer in any way.
I have already had TC918 RGB patches printed on this printer (patches assigned
AdobeRGB1998) and I created a printer RGB ICC profile of this process.
When I assign this printer profile to the original AdobeRGB1998 test image we
printed I get a very good approximation of the over saturated test print we
got. So far so good.
So I Imagined I just needed to use Convert-to-Profile on our AdobeRGB1998 test
image, to convert it into the printer color space that I built. Then to ensure
it gets handled by the external printer in exactly the same way as before, I
just assign it AdobeRGB1998 again.
When I do that, the test image now appears less saturated than it was before.
Great, that’s just what I would expect. With the boost of saturation of this
print process it should return back to normal when printed.
But what I did not expect was that the blackest pixels in the converted test
image that started out as RGB 4,4,9 are now RGB 30,29,28 after conversion. That
sounds crazy to me!
I have not printed this converted test image yet. I don’t want to waste my
money printing this converted file if I have got this wrong. But everything
else looks like what I would expect.
Anyone else familiar with profiling printers as a 'Black-box'?, is this kind of
thing with the high black point normal?
Thanks
Peter Miles
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