Re: profiling back-printed plexiglass?
Re: profiling back-printed plexiglass?
- Subject: Re: profiling back-printed plexiglass?
- From: Ben Goren <email@hidden>
- Date: Fri, 19 Aug 2016 13:24:13 -0700
On Aug 19, 2016, at 11:43 AM, Randy Norian <email@hidden> wrote:
> I thought I’d just characterize the output on the plexiglass, however my ES-2000 won’t read the swatches through the plexiglass, for whatever reason — it simply faults out.
You're unquestionably going to need an instrument that can get accurate readings of the swatches.
The geometry of the samples is going to be quite a problem, I should think. If you can print on super-thin plexiglass, that _might_ work -- assuming, of course, that the plexiglass itself is "close enough" to spectrally transparent. Otherwise, having a big chunk of optical material between the illuminant and device when none is anticipated just isn't going to work.
If you've got plenty of money to throw at the problem, you can use a spectroradiometer with a narrow angle of view, combined with careful lighting (being especially concerned about incident reflections). You'd certainly need a blacked-out room (including walls, floor, and ceiling) for the task.
If you're trying to do this on a budget...if you really know what you're doing, you can use a camera in a similar geometrical configuration as a poor man's colorimeter. But that requires having a good spectral model of the camera's sensor response, amongst other challenges.
I think I can pretty confidently predict that, unless the thin plexiglass option pans out, you're either in for quite a challenge or disappointment. The best advice I can offer is for you to brace for either and decide up front how much you're willing to invest in the task.
Or...what would constitute "good enough" for your purposes? Don't shy away from using an H/S/L layer in Photoshop and calling it a day, if that's something you can live with.
Cheers,
b&
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