Re: Weird printer profile
Re: Weird printer profile
- Subject: Re: Weird printer profile
- From: Claudio Wilmanns <email@hidden>
- Date: Thu, 30 Aug 2012 00:41:03 +0200
Hi Matthew,
If you select a profile from the "Profile" section within ColorSync Utility's main window, the displayed gamut is typically calculated from the perceptual table in the A2B0 tag. You can't rely on the colorimetric gamut shape using that tag as the profiling software somehow "optimizes" it in a vendor specific way. This often leads to artifacts in the gamut shape, such as a distorted area in the shadows (which can be seen in your screenshot as well).
Open the profile (using the open button) for further inspection and chose the A2B1 tag. This tag contains relative colorimetric data and should provide a more natural gamut shape of an output device.
But nevertheless, the distortion you can see in your screenshot points to some other problem and is likely to be seen in a similar manner in the A2B1 table. There are several reasons that can cause such problems.
The following are only some ideas:
- ink was not laid/dry when measured (the driver is optimized for Epson inks, and other inks can behave different)
- you measured too fast or maybe held the i1Pro in a way that the aperture was not directed perpendicular over the paper surface
- you measured one or more rows of patches twice or in the wrong order by accident
- your i1Pros' internal light source gets weak or the device itself is defective (i1Pros should be send in for maintenance/recertification on a regular basis, if frequently used, X-Rite recommends every year)
I'd recommend to not use generic L*a*b* values to check your i1Pro against, the deviation to your copy of the chart is probably too high for a qualified answer.
You'd better get the free i1 Diagnostics from X-Rite servers and test your device with it. But even if this utility says your device is OK, it can be defective, but eventually didn't show it on the first test. So run it more than once, twice, thrice…
Do you have a friend who has an i1Pro or know a studio that does. Maybe he/they can measure the chart for you to have a second guess where the issue comes from.
Best
Claudio
Am 29.08.2012 um 16:03 schrieb Matthew Ward:
> Dear all
> I made a printer profile using some cheap Inks
> target printed through Eye one software
> OSX 10.6.8
> Epson R2400
> Eye One Pro
> Eye One Match 3.6.3
> i1 RGB 1.5 target
> Ink: INK
> Paper Epson Archival Matte
>
> The printer results are deeply weird (neutrals are massively cyan, blues are magenta) and looking at the profile in ColorSync Utility it is skewed and from approx 60 through to 100 L it does not even cover the neutral L* axis. I have uploaded a screen grab here
> http://tinyurl.com/c3f26pq
>
> I tested the i1 Pro for repeatability of measurement and against published values of a Colorchecker Target: it had an average error of about 1.5de 1976 - max 3de.
> I printed out nozzle checks of the INK inks and visually compared them against K3 inks - they are slightly different - magenta and cyan but not massively so.
>
> Has anyone got any ideas what to try next?
>
> Best
> Matthew Ward
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