[argyllcms] Re: [Possible bug in Spyd2.c] Inconsistant readings from Spyder3

  • From: howdy555@xxxxxxxxx
  • To: Graeme Gill <argyllcms@xxxxxxxxxxxxx>
  • Date: Fri, 6 Mar 2009 16:05:42 +0100

> The spyder 3 produces values of exactly 0.0 all the time for black on my CRT.
So even if there is a problem of erroneous readings of something close
to zero, it would be indistinguishable from valid measurement...
> The manufacturers driver produces the same reading.
Could I ask you to try to measure very dark grey (I tried using XYZ: 0.196480
0.200497 0.384248) instead. Maybe you would be able to reproduce the problem.
Please make at least 20 measurements before giving up :)

Also, could you make the same test but with full white and about 20
measurements? Does the result decrease, increase or stays more or less
the same?

> Even with your modification (bumping the time up to 32 seconds),
The whole measurement takes about 19.5 seconds (tested with spotread
> [For comparison the i1pro produces XYZ values of 0.048 0.051 0.064,
> and the Spyder 2 values of 0.035 0.042 0.043 ]
So the error is 0.064 -> perfectly acceptable for me :) I was
referring to errors of about 0.200 when measuring a value of about
0.200 :).

Other related posts: