[argyllcms] Re: Why measure dark level for SpyderX?

  • From: Graeme Gill <graeme@xxxxxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Fri, 24 Apr 2020 18:57:40 +1000

Ruslan Kabatsayev wrote:

Is this calibration done using the Auto_Zero command of AS7264N
instead of (what I initially thought) reading and subtracting the dark
value that would have to be retained on relaunches?

The Datacolor firmware seems to perform an AS7264N zero command
each time, but it is not effective. So the ArgyllCMS driver
does its own recording of the black level.

And what is the actual timeout time?

30 minutes.

What is it computed relative to —
I guess the file ~/.cache/ArgyllCMS/.spydX_60085949.cal contains the
last zeroing timestamp, right?

Yes.

Graeme Gill.

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