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

  • From: Graeme Gill <graeme@xxxxxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Wed, 26 Dec 2007 12:26:22 +1100

lee scratchy wrote:
I never use both at the same time, and I would like to somehow force the LUT in my dualhead
> ATI HD2600 PCI-E videocard......so the CRT lut would be forced on the primary 
VGA output and
> the DLP lut would be forced on the secondary DVI output.......I guess this is 
quite impossible ?

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

If the two outputs are visible to the operating system, then you should
see them listed with "dispwin -?", and you can simply chose the
display you want to install the calibration curve to with the -d parameter.

   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 ?

Yes, with red being the dominant adjustment needed. Naturally
this will alter your brightness level too.

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

It's just the direction each primary drags the white point in x,y space.

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

They're the chromaticity co-ordinates. They are used quite widely to describe
an arbitrary white point. The various D (Daylight) white points or
Black Body white points, as well as white points not on these
two locus's can be described by the x,y co-ordinates.

See <http://en.wikipedia.org/wiki/CIE_1931_color_space> for instance.

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 

It should be OK for all devices except the HCFR instrument.

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

You can always install the driver provided with Argyll, it just isn't
a filter driver. (I found the filter driver stuffed up device
removal on my system, so I don't use it). This means you have to
switch between drivers if you want to use the vendors software.

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...

Well, the reason it behaves as it does is to minimize the possibility
of the measurements accidentally being messed up. If it is set to
be a normal window, it may not be at the top, or could accidentally
be covered by something else. The -p parameters give you
some measure of control. Other calibration applications in fact
cover the whole screen and don't allow anything else to be seen
or done wile taking readings. There are good reasons for this
with a CRT, since the colors of other windows near the
test window quite noticeably affects the black level.

Graeme Gill.

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