Re: Real world experience w/ GMG and Oris RIPs
Re: Real world experience w/ GMG and Oris RIPs
- Subject: Re: Real world experience w/ GMG and Oris RIPs
- From: Andre Schützenhofer <email@hidden>
- Date: Tue, 30 Nov 2004 10:27:05 +0100
Am 29. Nov 2004 um 15:01 schrieb Graeme Gill:
I'm not following you at all. Why would you test the B2A table with
it's own
grid points ? For almost all reasonable inversion algorithms, the B2A
grid
point values will be perfectly accurate. They are the inverse of the
A2B table.
There is nothing to tune. (in my profiler, the inversion is generally
accurate to
about 1 part in 10e6 or better).
Tuning only has any meaning at all, if you are concerned about values
that
fall between the B2A grid points. Because of interpolation errors,
such values
will not be perfectly accurate. They might be made more accurate by
moving the
grid point values around, trading off decreased accuracy at the grid
points,
for improved accuracy between the grid points. If the "between the
grid point"
values are a particular test set (say an ECI2002 charts values), then
the
rendering for those particular chart test values might be improved, at
the cost
of poorer accuracy in other areas.
Graeme,
from my understanding, the profile grid points have been computed
already - they were interpolated form say an ECI2002 chart. If we send
LAB ECI2002-testchart values or others through the profile, those
initial "grid points" (specific test chart values) most likely do not
exist anymore and have to be interpolated form an interpolated profile
grid. Therefore, tweaking grid points seems to make sense to me.
Best regards,
Andre Schuetzenhofer
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