Re: Total Ink Limit (TAC)
Re: Total Ink Limit (TAC)
- Subject: Re: Total Ink Limit (TAC)
- From: Terence Wyse <email@hidden>
- Date: Sat, 10 May 2008 12:31:49 -0400
On May 10, 2008, at 9:28 AM, Lorenzo Ridolfi wrote:
Dan Wilson wrote:
In an ICC transformation does the Total Ink Limit (TAC) get changed?
Example:
On a proofer with a RIP, if I have a file that is being used for
sheetfed
with say 340 ink limit and I want to proof it for newspaper at say
220, does
the ICC transform change the ink limit to 220 so that my proof will
be
accurate for newsprint?
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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