[argyllcms] Re: Can I calibrate crap?
- From: Leonard Evens <len@xxxxxxxxxxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Mon, 27 Apr 2009 13:57:32 -0500
On Mon, 2009-04-27 at 11:18 -0500, Leonard Evens wrote:
> On Mon, 2009-04-27 at 17:58 +0200, Pascal de Bruijn wrote:
> > On Mon, Apr 27, 2009 at 3:51 PM, Stephen T <stwebvanuatu@xxxxxxxxxxxx>
> > wrote:
> > > I have a fairly new laptop with LED backlit LCD.
> > >
> > > I think my problem in calibration and profiling is a high black level,
> > > about
> > > 3 cd/m2. Contrast-ratio is poor even though brightness is pretty good, 112
> > > cd/m2 at less than max backlight.
> > > Before calibration my LCD has a distinct blueish cast.
> > >
> > > After calibration with -gs option only the native WP is a bit warm and
> > > contrast a bit flat.
> > > Trying to force WP to 6500 results in a sick greenish-yellowish colour
> > > cast.
> > > Using -f1.0 gives a contrasty look but kills the shadow detail, -f0.5 is
> > > better.
> > > Red in a test image looks orangeish, with or without calibration.
> > > Profiling
> > > corrects colors but everything comes out oversaturated.
> > >
> > > Any tips on calibrating crap LCDs would be appreciated. I have tried
> > > this before on an old Dell and gave up. I thought a new laptop would
> > > behave
> > > better. I have also calibrated an old CRT and that was easy enough.
> >
> > Hi,
> >
> > Although I need to revise part of the text of my following post, the
> > procedure has
> > worked wonders for my crappy HP 6730s laptop screen:
> >
> > http://blog.pcode.nl/2009/01/color-profiling-your-screen
> >
> > As you might notice, I'm sticking with the screens native whitepoint.
> >
> > Regards,
> > Pascal de Bruijn
> >
>
> One thing I don't understand about the original question. I'm
> surprised to hear of a laptop with an LED backlit display. It would
> seem surprising for a manufacturer to produce a `crappy' such display.
>
Let me add that were it really LED backlit, then you probably can't use
a colorimeter to calibrate/profile it. You would need a Spectometer of
specialized colorimeter designed for such illumination.
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