Re: Total Ink Limit (TAC)
Re: Total Ink Limit (TAC)
- Subject: Re: Total Ink Limit (TAC)
- From: Lorenzo Ridolfi <email@hidden>
- Date: Sat, 10 May 2008 13:55:01 -0300
Terry,
I agree with you. You must have a simulation profile in order to perform
this conversion. Colorburst RIP, for instance, allows this, but I know
other RIPs don't. The simulation profile is very useful for proofing,
but the user must know the data wasn't converted at all (it´s a
simulation). The safe path is convert the file properly to the newspaper
profile first (devicelink preferable) and perform the proofing on the
converted file.
Best regards,
Lorenzo
Terence Wyse wrote:
In a newspaper proofing transformation, the following conversions are
done:
Source profile (RGB or CMYK) -> Lab -> Newspaper profile (CMYK) ->
Lab -> Proofer profile (CMYK)
In the first conversion, from source profile to newspaper profile,
the resultant CMYK values will have the newspaper ink limit. But, the
conversion from Newspaper (CMYK) to Proofer (CMYK) will find the
CMYK colors in the proofer space that matches the newspaper and the
proofer CMYK values may have higher TAC value than the newspaper, but
will match colometrically the newspaper colors.
But...the addition of a simulation profile in a proofing RIP is not
typical. Most of the time you set your press as source profile and
then any image sent to the RIP gets this profile *assigned* to the
image regardless whether the image is tagged or untagged. What you'll
get is a simulation of how an image with 340% TAC will print on a
newspaper press. The addition of the transform to the simulation
profile can give one a false sense of how the image will print UNLESS
the image is eventually converted to the "Newspaper" profile via
either a standard ICC transform or via device links.
Regards,
Terry
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