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

  • From: lee scratchy <leescratchy@xxxxxxxxxxx>
  • To: <argyllcms@xxxxxxxxxxxxx>
  • Date: Sun, 23 Dec 2007 04:41:12 +0000

Hi again Graeme,

thanks for the helpful reply ;)

OK so I'm totally in love with the L* gamma.

it makes my HD movies look much more natural, it's just amazing! like watching 
through a window.

picture is a bit too bright though, but I fix it with +4 levels mapping in 
ffdshow to make it a tad darker.

so here's the HCFR diagram with "dispcal -v -yl -t6500 -p0,0,2 -gl -qh test" :

I've never been able to get such a low deltaE with the HCFR app or the 
spyder2pro app

The thing is that the "-qh" made the process take around 90 mins, maybe more :)

I understood the Eye One Display was much more accurate when it comes to deltaE 
measurements(almost similar to the Eye One Pro), and that it was sensitive up 
to 20 IRE with a videoprojector....the spyder2 is sensitive up to 30 IRE, and 
needs much longer integration time as you said...

also the s2 would be quite off when it comes to creating CIE 
diagrams....compared to the eye one display/Pro...but I don't care too much 
about that.

do you think the Eye One Display is more accurate than the s2 when it comes to 
DE measurements ?
I'm still hesitating to upgrade, considering only the red levels are off <30 
IRE when used with argyll with "-qh"....

anyhow I'm really happy with the PQ now, kudos for such a nice little app ;)

Best Regards,


> Date: Sun, 23 Dec 2007 15:06:25 +1100
> From: graeme@xxxxxxxxxxxxx
> To: argyllcms@xxxxxxxxxxxxx
> Subject: [argyllcms] Re: dispcal: Warning - RegOpenKeyEx failed with 2
> lee scratchy wrote:
> > ok so here's the deal :
> > http://img523.imageshack.us/my.php?image=argylltf1.gif
> > 
> > top is argyll, bottom is s2pro software.
> So they are pretty similar in end result then.
> > so I've used "dispcal -v -yc -t6500 -qh test" then "dispwin test.cal"
> Sounds reasonable.
> > BTW, does dispcal reset the LUT before calibrating or should I reset it 
> > with some other app ?
> dispcal takes control of the LUT for the calibration, and should restore the
> contents when it exits.
> > I've used the pre-calibration options(choice 5) of dispcal to set the OSD 
> > properly,
>  > I've played around with R/G/B and brightness....but it didn't ask to 
> change the contrast
>  > setting...did I miss something ?
> Usually for a CRT, the contrast control affects the white level, so you'd
> adjust it in the menu item 3, while the CRT brightness control affects
> the black level (menu item 1).
> For LCD's it's almost impossible to know what a "contrast" control does,
> since it doesn't relate to the display device, but is purely electronic,
> so the best advice is to set it to it's default setting (if you can figure
> this out).
> > I'll try on my DLP projector during the week-end, the s2pro did a pretty 
> > poor job
> <30 IRE...but the spyder2 is notorious for being not too sensitive in dark 
> colors,
>  > which requires to make much longer measurements I think.
> Yes, it's accuracy does improve with longer integration time. I've fiddled
> my driver to do that automatically to some degree, but it's hard to know
> what sort of trade-off is reasonable.
> > do you think I would see some major improvement if I upgraded to a Eye One 
> > Display ?!
> Hard to say. They use what is basically the same sensor, it just comes down
> to the filters, geometry, calibration and drivers. The Spyder is somewhat more
> sophisticated, having seven sensors and filters, but I'm not sure whether
> this turns out to be much benefit in the end or not.
> Graeme Gill.

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