[argyllcms] Re: More about the Huey that comes with the XL20

On Monday 13 April 2009 01:03:02 pm Gerhard Fürnkranz wrote:
> -------- Original-Nachricht --------
>
> > Datum: Mon, 13 Apr 2009 13:15:07 -0500
> > Von: Leonard Evens <len@xxxxxxxxxxxxxxxxxxxxx>
> > An: argyllcms@xxxxxxxxxxxxx
> > Betreff: [argyllcms] More about the Huey that comes with the XL20
> >
> > Second, the Huey that came with the
> > monitor says `LED' on it.
>
> The same applies to my i1 Display bundled with the XL20, it is labeled "LED
> SyncMaster" (my XL20 was bundled with an i1 Display, and not with a Huey).
>
> > I suspect that this device was produced together with the Natural Color
> > Expert software explicitly for the Samsung LED monitors. It is possible
> > that its readings are not interpreted correctly by the ARgyll software.
>
> I can't speak for the Huey, but with my i1 Display readings taken with NCE
> and readings taken with dispread -yl did agree very closely on the
> chromaticities of white and the three primaries. So I think the readings
> are interpreted correctly by Argyll (at least as correct as they are
> interpreted by Samsung's NCE sofware). I can't of course assess the
> absolute accuracy, and I also don't have any other "regular" monitor
> colorimeter for comparison.
>
> The XL20 calibrated with dispcal looks fine, subjectively judged. My
> feeling is rather that other LCD displays end up with a red/magenta tint,
> if I calibrate them to a D65 WP with displcal -yl, using the i1 Display
> that came with the XL20 (but again, I don't have any other "regular"
> monitor cololorimeter for comparison).
>
> And if I compare the XL20 with my notbeook side by side, both calibrated to
> D65 using my SyncMaster i1 Display, then the tints of white are visually
> significantly different (my feeling is, this must be rather >= 5 dE),
> although the measured white points agree with a tolerance of about 1 dE (at
> least short term, immediately after calibration).
>
>
> Btw, did anybody here ever manage to achieve a really good visual
> sidy-by-side match of the white points of different displays (not the same
> model, but various different ones), using one of the low-cost colorimeters
> available on the market? I had tried a few notebook displays, a CRT, the
> XL20, yet another LCD display, but eventuelly they look all a little bit
> different and there was no pair of two displays, which really did agree
> visually after calibration.

I have an LCD and a CRT that are a close match once I have them calibrated.  
The biggest difference being that the black level of the CRT is somewhat 
darker but I think that I could calibrate for that as well but I have not 
bothered with it yet.   The white point, luminosity and mid tones match up 
nicely.  But I have to jump through a lot of hoops to make it work and I think 
some of the things I am doing for the LCD are vendor/model specific.  Also I 
think it would be harder to match two LCDs than to match an LCD with a CRT 
because I have found no way to actually change the white point on my LCD (the 
RGB controls are more like black point controls) and it is likely that two 
LCDs (at least if they are not the same model and same age) will not have 
matching white points.  This should not be an issue for LED back lite LCDs 
that have adjustable white points.

Hal

Other related posts: