[argyllcms] Re: Monitor calibration
- From: adam k <aak1946@xxxxxxxxx>
- To: "argyllcms@xxxxxxxxxxxxx" <argyllcms@xxxxxxxxxxxxx>
- Date: Tue, 23 Mar 2010 20:10:38 -0400
So much said about monitor calibration and I still don't know how to
proceed other than resetting to defaults and starting there thru all
the steps applicable.
Thank you!
Sent by AAK from iPhone 3Gs
On Mar 23, 2010, at 8:04 PM, Steffen <mail@xxxxxxxxxxxxxx> wrote:
> Am 23.03.2010 16:53, schrieb Adrian Mariano:
>> On 3/23/2010 11:45 AM, Pascal de Bruijn wrote:
>>> On Tue, Mar 23, 2010 at 3:59 PM, Adrian Mariano<adrian@xxxxxxxxx>
>>> wrote:
>>>
>>>> So you mean setting the RGB channels to equal values as reported
>>>> by the
>>>> display (e.g. all of them are set to "80") as opposed to setting
>>>> the RGB
>>>> values to achieve a target white point?
>>>>
>>> Yes... Why would you do that?
>>>
>>> Why have the display digitally correct the whitepoint, and then
>>> load a
>>> VideoLUT to correct it some more...
>>>
>>> It seems logical to me to have the correction in one place... But
>>> maybe I'm mistaken...
>>>
>>
>> If you had a continuous control of R, G, and B, as I believe you
>> may on
>> a CRT, then adjusting these channels on the monitor could improve
>> your
>> calibration because it's not limited by bit depth. I can imagine
>> some
>> kind of display with a 3 color backlight that could also behave
>> this way
>> (though I don't know if such a thing exists).
>>
>> In any case, I didn't know there were monitors that had for the
>> factory
>> default unequal settings on the RGB channels. I had read that you
>> should assume the factory default is the minimally adjusted
>> configuration, adjust only the brightness as desired, and then
>> proceed
>> from there. When you said that RGB should be adjusted to be equal, I
>> assumed that must mean to change the white point---perhaps to remove
>> some bad color cast---since I assumed that equal values was the
>> starting
>> configuration.
>>
>
> There are indeed monitors with unequal RGB gain values from factory,
> like the Eizo S2433. Whatever works best, I suppose.
>
> And there is a distinct advantage when working with the gain
> controls on
> the monitor to achieve a starting point as close to the target as
> possible. Most of the higher grade monitors have a 10 bit deep LUT.
> That
> means, that unlike the 8 bit available through ordinary LUTs for the
> software correction on the graphics card, changing values in the
> display
> won't "throw away" as much information as a correction on the software
> side would. I hope this is what the discussion was about, if not, I
> apologize for my lazy reading habits ;-).
>
> Cheers,
> Steffen
>
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