Re: basiccolor INPUT
Re: basiccolor INPUT
- Subject: Re: basiccolor INPUT
- From: email@hidden
- Date: Sun, 06 Nov 2011 17:02:34 -0800
understood, I was following a branch off of the thread bringing icc
scanner input profiles as an example of the idea of input device gamut
into the discussion... ignore me...
Tyler
> 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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