[argyllcms] Re: Multiple issues with Argyll, please help

From: Rajiv Mehra <to_rajivmehra@xxxxxxxxx>
To: argyllcms@xxxxxxxxxxxxx
Date: Fri, 29 Aug 2008 11:17:20 -0700 (PDT)

Thanks for the tips, I will run the -r and -R switches and report back soon.
This is a Windows Vista Ultimate PC which I use as a HTPC. 
The video player is Vista Media center and Power DVD. These apps handle the 
PC-Video brightness issue differently. However the nVidia card driver lets me 
force all video players in either 0-255 or 16-235 mode.
Forcing 0-255 gives me good black level in movies but clipping at the white 
end (high IREs). I cannot differenciate between 98, 99 and 100.
Forcing 16-235 gives me elevated black levels but no problems at the white end.
I think I should keep it at 0-255 and run Argyll again.
 Regards,
Rajiv Mehra

----- Original Message ----
From: Graeme Gill <graeme@xxxxxxxxxxxxx>
To: argyllcms@xxxxxxxxxxxxx
Sent: Wednesday, August 27, 2008 9:52:34 AM
Subject: [argyllcms] Re: Multiple issues with Argyll, please help

Rajiv Mehra wrote:
> It clearly tells me that the display is closely tracking the reference 
> luminance
> curve...........that means my blacks should be totally black and I should 
> have all the
> shadow-detail as is intended.

One way of checking if it's the calibration is to do a dispcal -R and then
a dispcal -r with the calibration curve loaded, and compare the contrast
ratio and black level.

> I think now it is a matter of the age-old problem of 16-235 or 0-255. 
> Something in my
> HTPC is keeping the desktop levels at 0-255 and the video player (media 
> center) is
> changing the video levels. I am not sure which one is which one , 
> yet...........but
> will find out soon enough by experimenting.

Yes, that could be a "gotcha". What sort of system are you playing back on ?

If it's an intel motherboard running X11, then this thread may be of interest:
<http://lists.freedesktop.org/archives/xorg/2007-October/029731.html>.

Graeme Gill.

[argyllcms] Re: Multiple issues with Argyll, please help

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