Re: i1Pro weirdness & fix
Re: i1Pro weirdness & fix
- Subject: Re: i1Pro weirdness & fix
- From: Ernst Dinkla <email@hidden>
- Date: Mon, 29 Feb 2016 15:13:40 +0100
I had a gut feeling my i1 Pro (UV enabled) is reading too much reflectance
on whites now. I measured a new paper for SpectrumViz recently, the Arca
Proline Vibrant Superior Rag etc, that showed the highest white reflectance
of any paper so far. I know it comes from Felix Schoeller and I have
similar papers from that stable that measure a bit lower in reflectance.
Platine category. There has been a steady improvement in inkjet coatings
whites over the years though. 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 see no
sign of fluorescence in the Teflon. This will not be the same piece of
Teflon tape I used before but I do not expect beyond 100 numbers in any of
them.
I have a license of Patchtool but did not know this restore function.
Checked whatever could be wrong in my calibration of the i1 Pro, calibrated
then and used the restore function of Patchtool. It soon gave the feedback
that no restore was needed, if should be fine. I still measure Lab L 100.3
on that Teflon, climbing to 100.5 on a fresh tape layer. Tested the i1 Pro
on some 3mm thick color acrylate samples I have stored. The new i1 Pro got
initiated on them in 2010 when it arrived and I stored the mesurements with
the samples. Differences at most 0.3 (black) on the Lab L values of the 7
samples where I see 0.2 between measurements today. About 0.4 (0.7-0.1) in
time on the a b values.
Conclusion: Nothing to worry about. This must be a very bright Teflon tape
sample and the i1Pro (UV enabled) is somewhat optimistic near Lab L 100 +
minute content of OBA in the Teflon, Lab b -0.1 in more than half the
measurements. Lab L 94 of the white acrylic sample is unaffected . The i1
Pro calibration white spot is fixed at Lab L 95.7. If it had aged and get
darker the white acrylic sample measurements should have showed that, no
change in the Lab L value though. The Lab b shifted 0.7 though either in
the calibration spot or the acrylic sample or both. I should have made
spectral plots of the two or three calibration whites here six years ago,
not just Lab numbers written down.
Met vriendelijke groet, Ernst
http://www.pigment-print.com/spectralplots/spectrumviz_1.htm
January 2016 update, 700+ inkjet media white spectral plots
On Tue, Feb 23, 2016 at 2:13 AM, Graeme Gill <email@hidden> wrote:
> Alexey Gribunin wrote:
>
> > By the way, just as an idea - is it possible to make special "cleaning"
> utility for i1Pro
> > and Spectrolino, which will turn lamp on forcibly for some seconds to
> "clean" it?
>
> Looks like X-Rite beat me to that -
> someone pointed out that there is a function exposed in BabelColor
> PatchTool
> called "lamp restore" that appears to use a new function in the i1Pro SDK
> (V4.2.2 or
> later). See <http://www.babelcolor.com/index_htm_files/PatchTool_Help.pdf>
> page 87.
> This sounds a lot like it is intended to deal with what I discovered.
>
> [ From my own limited experience with my instruments, I'm wondering if
> i1Pro2's
> are more prone to it ? ]
>
> It's possibly too that a recent copy of X-Rite's i1Diagnostics also
> includes such
> a function, although it doesn't seem obvious what or if it is doing this
> kind
> of thing.
>
> I'll add an option to ArgyllCMS spotread to diagnose and attempt to fix
> this
> problem in i1Pro's as well, and be a bit more up-front about what's going
> on.
>
> Graeme Gill.
>
> _______________________________________________
> Do not post admin requests to the list. They will be ignored.
> Colorsync-users mailing list (email@hidden)
> Help/Unsubscribe/Update your Subscription:
>
>
> This email sent to email@hidden
>
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Colorsync-users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden