[argyllcms] Re: Making profile of uncalibrated display

  • From: János, Tóth F. <janos666@xxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Mon, 16 Apr 2012 19:56:16 +0200

What if you use a test chart with 256 patches per primary channels + 100% white?

Isn't this enough to remap the input values to the output values which
are closest to your target tone response and scale these curves
relatively to each other to correct the white point?

2012/4/16, Graeme Gill <graeme@xxxxxxxxxxxxx>:
> Kai-Uwe Behrmann wrote:
>> But given the outlined limitation of measurement values inside a profile
>> on top of a calibrated
>> device,
>> would it be possible to go the other way around and create a profile with
>> VCGT from a complete
>> measurement set without any involved LUT/VCGT
>> calibration?
> Hi,
>       I guess so, but I'm not sure what the point is. There are two main 
> reasons
> for doing calibration. One is to make absolute changes to the device
> behaviour
> that profiling doesn't easily allow. The second is to improve the behaviour
> of
> the device in more detail (because it's done as 3 x 1 dimension measurements
> and tables rather than 1 x N dimensions). Creating a calibration out of a
> samples
> spread throughout N-dimensions is likely to have poor precision compared to
> directly
> making calibration measurements for each device channel.
> In the case of a display calibration the advantage of interactive adjustment
> (finding in practice the device values that are neutral) is also lost.
> Graeme Gill.

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