Datacolor User to User Support Group.

Haven't tried it lately, so I can't make any guarantees, but thats the  
theory.

There is no such thing as "native gamma", as the native tone response  
curve will never be exactly a perfect gamma curve, nor will it be  
identical in all channels. It would be less misleading to call it  
something like "native tone response" or perhaps "native stock market  
graph" as it may well look more like that then like a gamma curve.

To leave the gamma untouched means making no adjustments to the  
videocard VLUTs. So these should be "null" in such an instance, though  
there will still be a tag for them in the profile.

Such a method leaves the screen off color, and may bias the eye in  
such a way that profiled images in colormanaged apps will not look  
correct.

C. D. Tobie
Global Product Technology Mngr.
Digital Imaging & Home Theater
Datacolor.com
CDTobie@...

On Jun 10, 2009, at 9:23 AM, "Doug Kerr" <doug.kerr@...> wrote:

> Hi, David,
>
> --- In datacolor_group@yahoogroups.com, Cdtobie <CDTobie@...> wrote:
>>
>> Native gamma means profiling without calibration. This is really only
>> for scientific purposes, but you can turn calibration off, and run  
>> the
>> measure function in that state to produce a profile without
>> calibration.
>
> As I recall from my testing with OptiCAL, there, if one selects  
> "profile" [only - not calibrate as well], the resulting profile file  
> still includes a vcgt tag (ordinarily carrying the LUT load for the  
> calibration process). I have assumed that this is essentially a  
> "null" vcgt tag, such that an LUT loader, dealing with the profile,  
> will not implant anything into the LUT.
>
> 1. Is that indeed so?
>
> 2. Is the situation the same for the "profile only" mode in  
> Spyder3Elite?
>
> Thanks.
>
> Best regards,
>
> Doug
>
>
>
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