RE: [ECI-EN] ECIRGB versus LstarRGB
Bestmann, Guenter RD-PN32
31 May
2005
31 May
'05
11:18 a.m.
Hello,
the gamma function of eciRGB is
f(x) = x ^ 1/1.8,
the gamma function of LstarRGB is
f(x) = 1.16 * x ^ 1/3.0 - 0.16.
The chromaticity coordinates are in both cases the same.
The advantage of LstarRGB is a better distribution of the RGBs with respect to the visual
appearance. The advantage of eciRGB is a more even distribution of the RGBs with respect
to the CMYKs of a printing process like offset or gravure with TVI in the range of ~ 13 to
~ 20 %.
The eciRGB was developed by members of ECI. This is also true for LstarRGB but this
profile is not officially released by the ECI and is not a new revision of eciRGB.
Kind regards,
Guenter Bestmann
Heidelberger Druckmaschinen AG
Research & Development
Dr.-Hell-Straße
D-24107 Kiel, Germany
-----Original Message-----
From: eci-en-admin(a)lists.transmedia.de [mailto:eci-en-admin@lists.transmedia.de] On Behalf
Of Paul Sherfield
Sent: Tuesday, May 31, 2005 10:24 AM
To: eci-en(a)lists.transmedia.de
Subject: Re: [ECI-EN] ECIRGB versus LstarRGB
Joakim Eskildsen
am an artist photographer who make fine art ink-jet
print & CMYK
books. I have use the fine ECIRGB workspace and it works fine, but now
I have read about and also used LstarRGB and I am starting a large
printing of exhibition work (both ink-jet print and CMYK books) and I
wounder if there are anybady who can tell me if this newer gammer free
RGB space will be better than the EciRGB. I have tryed to read and
find info about on the web but there is not much. I work in
16 bit. I would be moust great full for any help regarding this.
I am using the ISO coted cmyk profile
Hi Joakim
Apart from the 'gamma' issue I believe that LStarRGB is very similar to ECIRGB. In
fact the same people created both.
Regards
Paul Sherfield
The Missing Horse Consultancy Ltd
Telephone: 01442 871752
Mobile: 07899 906385
Apple Solutions Expert-Print & Publishing
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