Re: i1Pro weirdness & fix
Re: i1Pro weirdness & fix
- Subject: Re: i1Pro weirdness & fix
- From: Ben Goren <email@hidden>
- Date: Mon, 29 Feb 2016 08:58:59 -0700
On Feb 29, 2016, at 7:13 AM, Ernst Dinkla <email@hidden> wrote:
> I got more alarmed when I measured a
> plumber's Teflon tape stack of 5mm thick and the reflectance gave a Lab L
> 100.+ where 9mm thicker stacks in the past did not go beyond L 99.
I've seen i1s measure PTFE a fractional DE above 100 in the past, too, and never thought about it. A subsequent measurement has been a similar fraction below 100. It was pretty obviously within the margin of error. Indeed, I'd expect surface irregularities to change the angle between instrument and sample that would be sufficient for that sort of variation.
Graphic arts really don't need that sort of precision, anyway. Even in the best viewing environments, moving your head can cause a more substantial difference in perception than what you're measuring here. There are situations for which the i1 family of instruments is woefully inadequate...but, for anything that's going to get printed and viewed by the general public, they're serious overkill (in a very good way).
Of course, the multiple-DE inter-measurement variations Graeme is describing from W deposition...that's a problem, no question. Having your samples go from Zone VIII to Zone IX in a span of a few minutes...not good. But that's also a malfunction of the instrument and one that seems to be both rare and easily enough fixed.
I'd worry much more about how well linearized the printer is. A well-linearized printer can be superbly profiled, at which point you get as-good-as-human-vision reproduction across the printer's gamut. And with a color management engine as good as Argyll, for out-of-gamut colors, the results are still shockingly good. As in, print the same thing on top-quality fine art media and uncoated typewriter bond, look at the two side by side, and even novices intuitively see and understand that the difference is the paper -- there aren't any hue shifts, there's no significant loss of detail, and so on; the paper's just a different color and the darkest areas aren't as dark and the saturation might be toned down, and that's it.
Cheers,
b&
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