Hello Kamil!
Yes, it's possible.
Please take a look on my 2 years old letter below.
Best regards,
Alexey Gribunin, UNIT Color Technologies, Moscow, Russia.
On 04/10/2019 15:10, Klami85 wrote:> Hello,
>
> Can we make icc profiles for backlit applications with argyllcms, i1
> Pro2 and some DIY lightbooth?
> New i1 PRO 3 can do that when using i1 profiler.
> I`ve found a program that can do that with older i1 PRO 2 -
> http://learning.it/lang/eng/FastBL.php
> However they are using some level of aproxymation instead real
measurments.
> Any suggestions what math is behind this or how to do that with argyll?
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On 23/11/2017 09:15, Tony Mah wrote:
> Wondering if this is possible?
> I have an NEC monitor with a 3d LUT set at D65, could I:
> 1. print a sheet of backlit film with color patches
> 2. display white on the monitor
> 3. put the film on my calibrated monitor
> 4. use my i1pro and measure each patch like a piece of paper
For sure, it's possible!
I'm making such profiling from time to time and the quality of such
profiles seems to me almost perfect. It gave very good visual gray
balance, smooth gradients and perfect details in highlights and shadows.
I think it's almost all we want from icc profile for photo reproduction :)))
On 23/11/2017 15:17, Graeme Gill wrote:
> it's much less important what the color temperature is,
> than how spectrally continuous it is, and how uniform it is.
Absolutely agree with Graeme, the color temperature itself is not so
important. I would say, the most important things are uniformity and
stability.
> A good quality light box may be a better bet, or a second hand DTP41T.
In the past I used LCD monitor without matrix (it was damaged, but lamp
itself was good, so I just remove the matrix and used it as a light
table). But the uniformity and stability is not very good, so it was
necessary to calibrate i1Pro every few patches.
Now I'm using iPad (!) and found it much more stable (auto-brightness=off).
But calibration every 10-15 patches is also highly desirable. It's
necessary to get really repeatable and reliable values.
I'm calibrating device during measurements in two different ways:
1. I'm making ArgyllCMS native calibration every 75 patches.
2. I'm measuring white patch every 15 patches and making linear spectral
correction afterwords in EXCEL.
Best regards,
Alexey Gribunin, UNIT Color Technologies, Moscow, Russia.
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