Re: Spectro as a densitometer
Re: Spectro as a densitometer
- Subject: Re: Spectro as a densitometer
- From: Neil Barstow <email@hidden>
- Date: Sat, 16 Nov 2002 18:41:08 +0000
Hi Graeme,
thanks for your very informative posts.
I wonder - IS it possible to ascertain correct density values from the
eyeOne Pro? [eg: For inkjet prints].
It would be very useful for pre and post profiling comparison of output
densities. [And manual rip linearisations too] There seems to have been
some disagreement here about the use of a spectro [I guess the eyeOne
qualifies as it can do spectral readings with PMP4.1] for density
readings.
Graeme,
it sounds as if you're saying it can be done.
On 29/8/02 at , Graeme Gill <email@hidden> wrote:
>
Densitometers apply various filters to the reflected light in front
>
of their 3 sensors. The spectral shape of those filters determines
>
what sort of density readings you get (status ABC etc). Lab
>
readings are determined using yet another set of 3 spectral
>
filters. You can't accurately convert from one set of filters
>
to another, without the original spectral (pre-filtered) data.
>
>
With a spectrometer, you are reading the spectral (pre-filtered)
>
light values, and you can therefore apply any filter set you like
>
mathematically, to end up with whatever density or other 3 component
>
colorspace you like.
>
>
Graeme Gill.
Chris Murphy wrote:
<< it's possible to derive density with an appropriate formula. I just
have no idea what that would be, and I'm not a programmer so I don't
know what it would take to make a plug-in/module for Eye One Share to
do this. I'd like to have it though. >>
me too
all the best
neil
Neil Barstow
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