Re: DICOM curve with spectraview
Re: DICOM curve with spectraview
- Subject: Re: DICOM curve with spectraview
- From: David Remington <email@hidden>
- Date: Sat, 5 Apr 2008 08:03:48 -0400
Re-sending just in case the misidentified subject line caused it to
bounce.
Begin forwarded message:
From: David Remington <email@hidden>
Date: April 5, 2008 7:48:47 AM EDT
To: email@hidden
Cc: David Remington <email@hidden>, Koch Karl
<email@hidden>
Subject: *****SPAM***** Re: *****SPAM***** Re: DICOM curve with
spectraview
Thank's Karl. That makes perfect sense. I was mostly curious as to
the shape and intension of the DICOM curve. The description sounds
similar (sort of) to the L * curve, and I have never seen it
discussed here or elsewhere. We use a mixture of sRGB and eciRGB,
and see Adobe files as well. We switched over to using L* on our
Eizos about a year ago. Spectraview is interesting software.
Besides the DICOM stuff and a user selectable gamma range it offers
L* and several video standards including sRGB, NTSC, and SMPTE-240M
as custom curve presets (proper offset and transition included in
all).
--David
On Apr 5, 2008, at 4:35 AM, Koch Karl wrote:
Generally any curve is acceptable, becaus color managed
applications compensate for the calibration curve in the monitor
profile.
If you want to do it absolutely right, you calibrate your monitor
to the exact tone curve of your RGB data. This ensures that the
color management system does not have to transform the tone
values, which – in an 8bpc system – would result in a (potentially
visible) loss of tone values.
So, if you mainly work with AdobeRGB files, calibrate to a gamma
of 2.2, if you mainly work with sRGB diles, calibrate to the sRGB
tone curve (which is NOT gamma 2.2), if you work with eciRGB_v2
(or a mix of the above mentioned) files calibrate to L*. IF and
only IF you work with DICOM (medical) files, calibrate to the
DICOM curve.
Best regards,
Karl Koch
basICColor GmbH
Am 05.04.2008 um 04:26 schrieb David Remington:
So I take it the curve is not optimum for graphic arts display?
On Apr 4, 2008, at 3:03 PM, colorsync-users-
email@hidden wrote:
Message: 6
Date: Fri, 4 Apr 2008 12:05:30 +0200
From: Koch Karl <email@hidden>
Subject: Re: DICOM curve with spectraview
To: "email@hidden Users Mailing List"
<email@hidden>
Cc: David Remington <email@hidden>
Message-ID: <email@hidden>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed;
delsp=yes
Ture,
I fully agree, medical stands today, where the grahpic arts were
pre-
ICC (some time in the late 80s).
Nevertheless it´s their standard, constituted by international
standardization bodies.
These are the reasons, why basICColor made a separate medical
product
for DICOM (and CIE) calibration (basICColor RAY) instead of
confusing
users in the graphic arts with a calibration, nobody (except for
health professionals) will ever need.
Best regards,
Karl Koch
Am 04.04.2008 um 09:57 schrieb Ture Pålsson:
(I used to work in medical imaging, and while it was both fun and
interesting, my spontaneous advice to anyone encountering DICOM
for
the first time is "turn and run!" :-) )
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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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
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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