Re: DICOM curve with spectraview
Re: DICOM curve with spectraview
- Subject: Re: DICOM curve with spectraview
- From: Richard Frederickson <email@hidden>
- Date: Thu, 3 Apr 2008 08:43:34 -0400
DICOM is a commonly used file format for medical images. See
http://www.sph.sc.edu/comd/rorden/dicom.html, among others.
What you describe makes sense since visual perception is logarithmic
and digital is linear. To make a linear black and white image appear
"natural," an S curve adjustment is necessary. My guess is that this
monitor is doing that for the end user to make digital images appear
comparable to film images (e.g., radiographs and X-ray films).
Just a guess,
Richard
Richard Frederickson (Contractor)
Scientific Publications, Graphics & Media (SPGM)
Advanced Technology Program, SAIC-Frederick, Inc.
National Cancer Institute at Frederick
Post Office Box B
Frederick, MD 21702
Phone: (301) 846-1546
FAX: (301) 846-6563
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I've just been setting up and calibrating a couple NEC 2190UXi
monitors using SpectraView 2. I'm still evaluating the systems but
find them to be good screens with very comprehensive software. One
thing I'm curious about is the option to use a DICOM curve for the
tonal response curve. The DICOM curve is described as aiming for a
perceptually linear tonal progression with each step in driving
level resulting in an equal visual step. I'm trying to figure out if
this means linear response or something similar (or identical) to
the perceptual response that the L* curve aims for (which is also
available as an option and what I am using now). Can anyone provide
more information?
Thanks,
David
David Remington
Manager, Digital Imaging and Photography Services
Digital Imaging and Photography Services
D-40 Widener Library
Cambridge, MA 02138
p 617-496-9346
f 617-495-0403
w http://imaging.harvard.edu
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