Re: basiccolor INPUT
Re: basiccolor INPUT
- Subject: Re: basiccolor INPUT
- From: email@hidden
- Date: Sun, 06 Nov 2011 13:55:58 -0800
I'm creating more confusion than necessary by not stating my questions
well... but you are cutting through.. thanks!
> 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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