Re: VIGC study on spectrophotometers
Re: VIGC study on spectrophotometers
- Subject: Re: VIGC study on spectrophotometers
- From: RaymondCheydleur <email@hidden>
- Date: Thu, 18 Sep 2008 08:47:59 -0400
- Thread-topic: VIGC study on spectrophotometers
As the standard does, I should probably explain what I mean by self-backing.
Self backing is generally thought of as multiple sheets of the same blank
substrate built up to be essentially opaque. Thick media that is opaque (and
yes the standard has a definition and calculation for this) is a different
matter. It doesn't really matter what you measure over because there is no
change in the data.
As to Graeme's concern I don't quite understand how self backing drives the
best visual result - this is usually the argument for a gray backing similar
to the light booth, but of course this is a pretty wide range of material.
You are free to use any backing you want for internal purposes, but in this
case I believe the issue is the interchange of data and the matching of
standardized reference data.
As far as the other suggestions about improving instrument agreement through
technology - I agree that there are some current and future approaches that
can help. My post was addressing the fact that there are fundamental good
measurement procedures that many people don't engage in which they could
address TODAY and get better results immediately.
RayC
Ray Cheydleur
OEM Project Manager
email@hidden
email@hidden
X-Rite Incorporated
4300 44th Street SE
Grand Rapids Michigan 49512 USA
t +1 616 803 2564 f +1 815 550 1712 c +1 616 560 2426
> From: Cdtobie <email@hidden>
> Date: Wed, 17 Sep 2008 20:43:27 -0400
> To: "email@hidden" <email@hidden>
> Cc: ColorSync <email@hidden>
> Subject: Re: VIGC study on spectrophotometers
>
> Self-backing is also a fact of life with thick media...
>
> C. D. Tobie
> WW Product Technology Mngr.
> Digital Imaging & Home Theater
> DataColor.com
> email@hidden
>
> On Sep 17, 2008, at 8:15 PM, Graeme Gill <email@hidden> wrote:
>
>> RaymondCheydleur wrote:
>>> - Use a standardized backer that fits CGATS.5 or ISO 13655.
>>> Self backing will generally increase noise in the data - sometimes
>>> dramatically, sometimes only a small amount.
>>
>> That seems to lead to a conundrum then, since self backing is
>> needed for profiles to match the visual result. I guess that
>> it's possible to use different backings for profiling and
>> verification,
>> but it's unfortunate then that they are disconnected, making
>> it cumbersome to accurately track verification errors back through the
>> color processing chain.
>>
>> Graeme Gill.
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