Re: Media Testing for maclife.de
Re: Media Testing for maclife.de
- Subject: Re: Media Testing for maclife.de
- From: Bob Marchant <email@hidden>
- Date: Thu, 11 Sep 2008 00:07:05 +0100
On 10 Sep 2008, at 20:25, Fleisher, Ken wrote:
Yes, we use Sinar here at the National Gallery of Art for capturing
artwork
and I agree that it does very well with the calibration. In that
use, I'd
say accuracy is the greater goal. Nevertheless, we are still not 100%
satisfied with the Sinar results because even when extracting the
raw data,
there is still some pre-processing that is baked into it. It's
pretty much
impossible to get just the raw, linear, cameral signals (after de-
mosaicing,
etc.) out of the file--
Yep...plus some of the problems ( more apparent in the past ) with
the obscure take on colur management and handling of camera profiles.
s, but Hasselblad also does a lot of preprocessing, such as over
sharpening, that is baked into the raw data. They do this so they
can claim
a greater MTF, but it's a false result. I don't know specifically
about
Lightphase in this regard.
Over sharpening and in the case of Lightphase overuse of noise removal.
It's true though, that there is a "reproduction" mode in some of these
systems, but the problem for us is that this repro mode usually
includes
their idea of pre-processing for the purpose of prepress. It's
still not a
scene-referred image capture, which is what we really need. That's
why I
claim that none of them are really aiming for accuracy.
Point taken.
Would it be possible to explain what you mean by spatial non-
uniformities in the lighting ?
Well, just that. Uneven lighting.
But that is a fundamental part of the target capture , and as such
prequisite for the use of the software in most cases.
. In the Sinar
software, this is taken care of when you do a "scene reference".
The camera
basically measures the non-uniformity by asking you to photograph a
white
card that covers your whole active image area, then makes
adjustments to
account for it so that the light is "even" throughout
Yes...I've got a couple of them <BG>
Regards,
Bob Marchant.
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