[argyllcms] Re: Green Color Cast with LUT profiles
- From: Pascal de Bruijn <pmjdebruijn@xxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Wed, 16 Sep 2009 12:05:43 +0200
On Wed, Sep 16, 2009 at 8:37 AM, Pascal de Bruijn <pmjdebruijn@xxxxxxxxx> wrote:
> 2009/9/16 Nikolay Pokhilchenko <nikolay_po@xxxxxxx>:
>> Pascal de Bruijn wrote:
>>
>>> > I've noticed, that on some generic LCD displays with classical CCFL
>>> > backlit get a green cast when calibrated with i1 Display 2 (a
>>> > colorimeter). It's because most of consumer colorimeter have far not
>>> > exact spectral sensitivity as in described in CIE standard for standard
>>> > observer. The correction matrix are applied to colorimeter data for every
>>> > kind of display type in software (LCD CCFL, LCD LED, Wide GAMUT LCD,
>>> > Projectors). If Your kind of display wasn't corrected by matrix by
>>> > manufacturer, the results may be quite far from wanted.
>>>
>>> Does this correction happen in hardware? Anyway I though the Huey was
>>> a stupid device... As in just a passive sensor... Since it has no
>>> firmware...
>>>
>>
>> The firmware may mean not only the program code, but the simplest correction
>> coefficient for certain device with certain filters and sensors.
>> The PC software may reads that coefficients from device memory (firmware)
>> and use the coefficients to interpret the sensors data. The every type of
>> display should have it's own coefficients in a colorimeter.
>>
>>>
>>> Please note that only the single shaper matrix profile looks good on
>>> my screen... Even the multiple shaper matrix looks a bit greenish..
>>>
>>
>> I'm glad to read it! :) So I'm right.
>>
>>> I'd appreciate any pointers to what might be the issue...
>>>
>>
>> The problem is in the Huey firmware coefficients, which are non-correct for
>> Your display (and may be for other displays too). The device sensor may be
>> just dirty. Or the devise may be broken.
>> Do You insured, that You have select the correct display type while dispcal
>> and dispread?
>
> I ran dispread with -y l yes, I did not run dispcal, I'm not using the
> VideoLUT...
Anybody any comments of the quality of the Color Munki vs a 1i? For
creating high detail profiles?
Also, the silly bit, if this was to blame on my Huey... Why am I
seeing this as well when I'm profiling my camera from an IT8 shot...
Regards,
Pascal de Bruijn
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