i1 Pro2 / dark calibration timer

[t***@public.gmane.org]

Hi,

the i1 Pro 2 spectrophotometer reportedly has a dynamic "dark calibration timer", that can be read out by software and tells if the device is still usable or has to be calibrated again.

When using dispcalGUI with ArgyllCMS 1.6.1, I get asked to calibrate my device before every single task (like calibrating, profiling, veryfing, etc.), which gets pretty annoying over time - especially when calibrating a projector - since one has to move the meter everytime and hope to get it in the exact same position again after black-point-calibration.
The developer of dispcalGUI said that this "dark-calibration-timer"-feature has to be implemented in the Argyll drivers to overcome that behaviour.

So my question is, if there are any plans to do so, or if there is any other way to prevent dispcal from forcing me to calibrate my meter everytime before doing measurements?
 
Thanks.

[Graeme Gill]

tilman_temp-***@public.gmane.org wrote:

Hi,

Post by t***@public.gmane.org
the i1 Pro 2 spectrophotometer reportedly has a dynamic "dark calibration timer", that
can be read out by software and tells if the device is still usable or has to be
calibrated again.

not that I'm aware of, no. Some calibration time info can be stored in the EEProm,
so the OEM software can use that to set a timeout. The ArgyllCMS drivers do a similar
thing, but they save the calibration info to a file, rather than writing to the
device.

Post by t***@public.gmane.org
When using dispcalGUI with ArgyllCMS 1.6.1, I get asked to calibrate my device before
every single task (like calibrating, profiling, veryfing, etc.), which gets pretty
annoying over time - especially when calibrating a projector - since one has to move
the meter everytime and hope to get it in the exact same position again after
black-point-calibration.
So my question is, if there are any plans to do so, or if there is any other way to
prevent dispcal from forcing me to calibrate my meter everytime before doing
measurements?

The -N flag is intended specifically for this purpose.

Graeme Gill.

[Tilman Hager]

Hi,

those are the posts I'm referring to when talking about that built-in timer:
http://www.avsforum.com/t/1423300/i1pro-vs-i1pro2/30#post_22376593
http://www.avsforum.com/t/1403754/new-i1pro-2-spectrophotometer/30#post_21895371

Since I don't have that SDK, I cannot verify their claims though.


And thanks for the hint on that -N option! I have seen it in the Argyll documentation, but thought that dispcalGUI would set it automatically when having "Allow skipping of spectrometer self-calibration" checked - it didn't.

Post by Graeme Gill
Hi,

Post by t***@public.gmane.org
the i1 Pro 2 spectrophotometer reportedly has a dynamic "dark calibration timer", that
can be read out by software and tells if the device is still usable or has to be
calibrated again.

not that I'm aware of, no. Some calibration time info can be stored in the EEProm,
so the OEM software can use that to set a timeout. The ArgyllCMS drivers do a similar
thing, but they save the calibration info to a file, rather than writing to the
device.

Post by t***@public.gmane.org
When using dispcalGUI with ArgyllCMS 1.6.1, I get asked to calibrate my device before
every single task (like calibrating, profiling, veryfing, etc.), which gets pretty
annoying over time - especially when calibrating a projector - since one has to move
the meter everytime and hope to get it in the exact same position again after
black-point-calibration.
So my question is, if there are any plans to do so, or if there is any other way to
prevent dispcal from forcing me to calibrate my meter everytime before doing
measurements?

The -N flag is intended specifically for this purpose.
Graeme Gill.

 

[Graeme Gill]

Post by Tilman Hager
http://www.avsforum.com/t/1423300/i1pro-vs-i1pro2/30#post_22376593
http://www.avsforum.com/t/1403754/new-i1pro-2-spectrophotometer/30#post_21895371
Since I don't have that SDK, I cannot verify their claims though.

It's technically possible. I haven't implemented this particular approach in the
ArgyllCMS driver at the moment though - I'm just using the covered cell data to
correct the black drift, same as the ColorMunki. What they are doing is setting
a threshold on it, and triggering a calibration request when it reaches the threshold.

Post by Tilman Hager
And thanks for the hint on that -N option! I have seen it in the Argyll documentation,
but thought that dispcalGUI would set it automatically when having "Allow skipping of
spectrometer self-calibration" checked - it didn't.

Sounds like that's what it should do.

Sometimes I have bugs in the driver that stop this working properly
- it's complicated and hard to test. For the i1pro2 in hi-res mode
I need a reflective calibration to improve the interpolation of the
emission calibration data, further complicating things.

Graeme Gill.