[argyllcms] Re: NEC monitor controls

I got the impression from the Argyll documentation that the LCD displays are doing something similar to a calibration if you change the temperature or the RGB settings. The advice seemed to be to set the display into the most native possible state and then do all your own calibration once, which would get the most out of the available bits. Is this not true? I set my display to native whitepoint and turned the brightness setting down to get 170 cd/m^2, and then calibrated it to sRGB (6500K) rather than using the sRGB setting on the display. Would I be better off to switch the display to sRGB? (How would I tell which approach is better?) Another note is the proper choice for the "sharpness" setting. Someone in an earlier message said "use the factory default" based on a vague reference. I encountered the following test pattern: 

http://www.lagom.nl/lcd-test/sharpness.php
and when I tuned the sharpness based on this test pattern I set it to 8.3%, which is significantly below the factory default setting around 26%. (I have a NEC 20WMGX2.) Of course, I don't have a real understanding of what this setting is doing and whether this particular calibration direction is right, but the effect on this test pattern is very clear. 
Roger Breton wrote:

Black point you don't have access on this monitor. So leave it a default.
Brightness you have access. I'd try 120 to 140 cd/m2.
Contrast? I don't know for sure.
Color temp, go for 6500 first.
Don't use native or presets.
Your monitor must have RGB controls?

as you might know from one of my last mails, I'm using two NEC
Multisync LCD1990FXp to do my work.
These monitors are capable of displaying the whole sRBG gammut (even a
little more tha this for red and green values) and offer some controls,
that other displays don't have.
My problem is, that I can't match those controls to the settings I need
to adjust before calibration. Maybe you could help me out, which setting
means which parameter in dispcal:

- Brightness
- Contrast
- Black-Point
- Color-Temp (Settings can be:
* sRBG (6500k) (which I use)
* original colors (means native colors of the LCD)
* several presets (9300, 8200, 7500)
* or RBG-Settings for each channel

The latter (Color-Temp) is clear.
But how do I use Brightness,  Contrast and Black-Point for adjusting?

Regards
Volker
Roger Breton

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