[argyllcms] Re: dispcal: Warning - RegOpenKeyEx failed with 2

  • From: lee scratchy <leescratchy@xxxxxxxxxxx>
  • To: <argyllcms@xxxxxxxxxxxxx>
  • Date: Tue, 25 Dec 2007 23:29:43 +0000

my bad, "y" is green and "x" is red......stupid me :)

BTW, could you make the calibration window a bit more user friendly ?
I like to resize it by hand while doing precalibration in order to have it as 
big as possible and still read the results...


From: leescratchy@xxxxxxxxxxx
To: argyllcms@xxxxxxxxxxxxx
Subject: [argyllcms] Re: dispcal: Warning - RegOpenKeyEx failed with 2
Date: Tue, 25 Dec 2007 23:19:19 +0000

ok thanks for the reply, but I run XP SP2 so when you talk about X11 I'm kinda 
lost :)

BTW, I got a question about the precalibration if you don't mind.

I get :

   Target B 0.44, x 0.3128, y 0.3291
\ Current B 0.43, x 0.4055, y 0.3743  DE 22.7  R-- G-  B+

so it says to remove a lot of red, a bit of green and add some blue, right ?

but If add some blue, "B" raises....if I take off some green "x" raises....so 
what's up with that ?

so "B" stands for blue, but "x" and "y" have no direct link with R and G ?

and also, you said that it was a bad idea to install a newer version of 
"libusb-win32-filter-bin" higher than the one you use in the modified 
drivers.....but there's only "libusb-win32-filter-bin-" on the 
official webpage.

and "libusb-win32-filter-bin-" is nowhere to be found :(

any chance you could offer a link to it on your own website ?

Thanks again!


> Date: Mon, 24 Dec 2007 01:09:45 +1100
> From: graeme@xxxxxxxxxxxxx
> To: argyllcms@xxxxxxxxxxxxx
> Subject: [argyllcms] Re: dispcal: Warning - RegOpenKeyEx failed with 2
> lee scratchy wrote:
> > actually I was more wondering about the DE measurements precision on the s2
>  > compared to the i1 display(which is supposedly very close to the i1 pro).
> > when the s2 gives me a 0.8 average DE, does that mean it's completely off..
>  > ..and might just be >10 average if I was to check with a i1 display ?
> You can't tell what the distribution of errors is from the average. 0.8 DE
> average is generally something that would be regarded as good. But it
> says nothing about the absolute accuracy.
> > but you seem to agree that the s2 is quite off on that point ? also with 
> > LCD ?
> It's impossible to say without a reference instrument to compare it to.
> The self check error reports indicate how well the display has been
> made to conform to the target, and how consistent the measurements
> are. But the absolute accuracy can't really be determined without
> something independent to compare with.
> > I'm already VERY happy with the PQ, but the idea of achieving better DE 
> > with a i1
>  > display is starting to grow on me ;)
> It may be slightly more consistent in its readings, and therefore
> give a lower self check report, but the visible effect would be
> hard to predict. Each type of colorimetric instrument will probably
> have a slightly different calibration for a given type of display,
> and therefore if compared side by side, may look slightly
> different. Once again, compared in isolation you may be
> hard pressed to see a difference due to this cause.
> And just to correct myself:
> >> The main advantage of the Eye One Pro is that it is going to be more
> >> accurate with any spectrum that a colorimeter has been specially
>                                                      ^ not
> >> calibrated to. The disadvantage is that it tends to collect less
> >> light than a colorimeter, so you really need a longer integration time
> >> to give a repeatable reading. 
> Graeme Gill.

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