Proofing for Stochastic Printing
Proofing for Stochastic Printing
- Subject: Proofing for Stochastic Printing
- From: "Barry Berenson" <email@hidden>
- Date: Wed, 29 Mar 2006 15:03:12 -0800
- Thread-topic: Proofing for Stochastic Printing
Is anyone doing inkjet proofing for stochastic printing and if so are
they using SWOP (tr001) as a standard or something else?
Thanks.
Barry Berenson
REI Photography Manager
email@hidden
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Today's Topics:
1. Re: New RIP, old RIP and device-link profiles (Tyler Boley)
2. Re: The color purple (Liz Day)
3. Ray Froude/Central/NECTECH/US is out of the office.
(email@hidden)
4. CMYK-CMYK (NOI)
----------------------------------------------------------------------
Message: 1
Date: Tue, 28 Mar 2006 12:09:01 -0800
From: Tyler Boley <email@hidden>
Subject: Re: New RIP, old RIP and device-link profiles
To: email@hidden
Message-ID: <email@hidden>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> From: Douglas Rhiner <email@hidden>
...
>
> We are switching to ErgoSoft StudioPrint shortly. And will be
> profiling via PMP & Eye-One.
>
> My question is, how would I go about creating a device-link profile
> so I can repeat the output that occurred under the previous RIP
> (ColorChoice) even though the "canned" profiles are so "secret-saucy"?
I have no experience with DL profiles, they may be the best answer for
all I know. I do know, however, that StudioPrint has a place to enter a
simulation profile and intent, no doubt cross rendering for proofing
purposes, but it may be useful for you as well by entering your old
profiles.
Tyler
------------------------------
Message: 2
Date: Tue, 28 Mar 2006 21:20:05 -0500
From: Liz Day <email@hidden>
Subject: Re: The color purple
To: email@hidden
Message-ID: <email@hidden>
Content-Type: text/plain; charset="us-ascii"; format=flowed
>The error in this companies presentation is the fact that they
represent
>purple as a spectral color at the blue end of the spectrum. Their
>"purple" is made up of the following RGB values:
>
>99R 57G 186B
Ah hah. I was always taught that the reason some purples and blues did
not register properly on film was the films' ability to respond to UV
light
which the eye did not see. This must be something other than that.
>This is a non spectral color in the magenta family. This means that
it
>is a color that cannot be produced by a single spectral frequency.
This
>is a color that is an illusion in the brain when you stimulate the
long
>wave cone and the short wavelength cone with very little stimulation
of
>the mid wavelength cone. I have always used this as an illustration
of
>how the eye has only three overlapping channels and is not good at
>discriminating multiple frequencies of light..... if you mix
>the light from a red and blue LED, the eye sees one color which is
>magenta. It is like saying that when you play a cord of spectral
>frequencies your eye only sees one note.
I think this is called "trichromatic" vision. An ornithologist
explained
this to me, because he was trying to find out whether birds have
tetrachromatic vision (i.e., does their brain blend the info from their
UV
cone in with all the rest, or see it separately). I have not heard
what
his results were yet.
>Now back to the tribecalabs...I think they are showing a short coming
in
>the RAW to color space conversion rather that the fact that digital
>cameras are blind to purple. It may also be a problem with the LCD in
>the camera. For their claims to be true, the camera would have to be
>blind to red, green, and blue as show from the data values above.
Sounds pretty dubious.
Aren't you glad that none of your clients are birds, so printing only
deals
with CMYK and not UV?
(Or does it?)
:-)
Liz Day
Indianapolis IN USA
------------------------------
Message: 3
Date: Wed, 29 Mar 2006 01:00:19 -0600
From: email@hidden
Subject: Ray Froude/Central/NECTECH/US is out of the office.
To: email@hidden
Message-ID:
<email@hidden>
Content-Type: text/plain; charset=us-ascii
I will be out of the office starting 03/27/2006 and will not return
until
04/03/2006.
I will be out of the office and will not be checking messages - please
contact Ron Willie or Todd Fender for pricnig. I will return your
E-mail
as soon as possible.
------------------------------
Message: 4
Date: Wed, 29 Mar 2006 16:38:26 +0300
From: NOI <email@hidden>
Subject: CMYK-CMYK
To: email@hidden
Message-ID: <email@hidden>
Content-Type: text/plain; charset=US-ASCII; format=flowed
Hello,
I have a problem when doing a CMYK to CMYK conversion : the file is a
raster and vector based image and I must convert from a sheetfeed press
profile to a web press profile. My concern is with the vector based
image : the sheetfeed profile is a ISO one and I know the dot gain, but
the web profile is a custom one. How to proceed for estimating the web
dot gain ? In your opinion how is the best procedure in such a case (
conversions from sheetfeed to web ) do to gamut difference ?
Thanks,
Salo
------------------------------
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