[argyllcms] Re: Need help with error message...
- From: Graeme Gill <graeme@xxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Sat, 11 Apr 2009 15:07:24 +1000
Raul Torres wrote:
I was able to calibrate the monitor white & black level\point with my
spyder2, however when moving on to the calibration process this is
what I get after 64 of 64 patches complete.
Initial native brightness target = 3.107830 cd/m^
Target white value is XYZ 7.489355 3.107830 41.295990
^^^^^^^^ ^^^^^^^^^
There's something badly wrong with your readings. A color
with such an XYZ value isn't even possible.
Adjusted target black XYZ 0.00 0.20 0.16, Lab 30.29 -130.55 46.15
Target black after min adjust: XYZ 0.00 0.20 0.16, Lab 30.29 -130.55 46.15
dispcal: Warning - Computing effective gamma and input offset is
inaccurate (0.000665)
Gamma curve input offset = 0.999000, output offset = 0.000000, power =
3226.405708
So you get silly numbers as things progress.
Total Iteration 3, Final Samples = 64 Final Repeat threshold = 0.600000
Creating initial calibration curves...
dispcal: Error - Mcv fit conjgrad failed
And then the maths fails.
Use spotread to figure out what's going on, and to get
a reasonable white value (XYZ's approximately equal
and a Y values somewhere between 50 and 400 depending
on whether this is a dull CRT of a bright LCD).
You can put up a white test window using "dispwin -m".
If you're always getting nonsense, even after the usual things like
unplugging and re-plugging the instrument, run with diagnostics
on (spotread -D5), and send me an email of it.
Graeme Gill.
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