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

From: Rajiv Mehra <to_rajivmehra@xxxxxxxxx>
To: argyllcms@xxxxxxxxxxxxx
Date: Tue, 19 Aug 2008 12:59:21 -0700 (PDT)

I looked into my old HCFR files.........the best reading on a 100% white window 
is around 40cd/m²  :-(
Since this is a 3 gun CRT projector I really cant point the meter towards the 
PJ. The convergence of the three guns needs to be spot on (on the diffuser) in 
order to get accurate readings. That means I will have to keep the diffuser on 
the screen's plane.......not possible without actually moving the PJ back or 
reconverging just for calibration.
Also I want to take the screen into account too........unless there is a way to 
adjust for the screen within Argyll.
Thanks
Rajiv

----- Original Message ----
From: Frédéric <frederic.mantegazza@xxxxxxxxxxx>
To: argyllcms@xxxxxxxxxxxxx
Sent: Tuesday, August 19, 2008 12:01:15 PM
Subject: [argyllcms] Re: Multiple issues with Argyll, please help

On mardi 19 août 2008, Rajiv Mehra wrote:

> I am using Argyll to calibrate an LCD monitor, a Plasma TV and a CRT
> Projector (a Sony G70). My meter is a X-Rite Display 2 LT. But after
> playing around with Argyll for quite some time I have some issues. I was
> hoping people who are well versed with Argyll may be able to help me. 

Did you check the values the sensor returned? With projectors, you have to 
be carefull to be in a realistic range, to avoid clipping or too low 
levels, which both lead to strange results. Try to move the sensor 
from/toward the screen (or the projector, depending how you are taking 
measures, direct or reflected), to get white value arround 100cd/m², as 
for standard monitors.

I think it is very difficult to get such value with a reflected measure; 
that's why we put the sensor toward the projector, using the diffusor for 
ambiant light measurement. This gives good results.

Hope this helps...

-- 
    Frédéric

    http://www.gbiloba.org

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

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