Re: basiccolor INPUT
Re: basiccolor INPUT
- Subject: Re: basiccolor INPUT
- From: edmund ronald <email@hidden>
- Date: Mon, 07 Nov 2011 00:50:51 +0100
I dunno, but it seems to me that any information obtained by means of a
testchart with a limited number of pigments under a certain light source is
not necessarily very significant; information obtained by shining a
monochromator at the sensor, or using Image Engineering's device will be
more complete. As to ICC being a standard format, yes that is true but
nowadays it is pretty much a useless format because DNG is what the most
used Raw renderer employs to reinvent the colors.
Edmund
On Sun, Nov 6, 2011 at 10:35 PM, Graeme Gill <email@hidden> wrote:
> email@hidden wrote:
>
>> well I'm displaying a misconception then on my part. I hate to stray more
>> from the topic... but I assume then that input profiling has some method
>> of determining device performance, and therefore space size and
>> limitations, beyond the sample data sent and returned from the device?
>>
>
> Hi,
>
> I'm not sure what you mean by "device performance", but profiling isn't
> magic.
> A profiler simply takes the correspondence implied for each sample point
> between device values (ie. RGB) and PCS values (ie. CIE XYZ) and casts them
> into a standard format (ie. ICC). This implies casting it into a continuous
> rather than discrete (sample point) form. Naturally the continuous mapping
> will be most accurate when it is close to, or between sample points
> (interpolation),
> and less accurate the further it gets from any sample points
> (extrapolation),
> but fundamentally there are no limits to the domain or range of the
> mapping.
> When cast into a particular representation such as an ICC profile, there
> will
> be limits imposed by the encoding of the RGB and PCS values though,
> implying a
> certain gamut, but this limit is not related to the test chart.
> The gamut of reasonable accuracy will be largely set by the test chart, but
> something like an ICC profile has no way of representing this, even if
> there
> was a criteria for computing it.
>
>
> Graeme Gill.
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