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 10:28:25 -0300
Hi Dan,
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.
I assume it would map the colours from the original colour space to the
target colour space (relative colorimetric) reducing the TAC in the process.
Yes, in the first transformation described in the previous paragraph. If
you want to simulate the newspaper paper color, the match will be
absolute colorimetric, if not, relative colorimetric.
I understand the file has not changed and will need to be adjusted later
(maybe with a device link) to be suitable for the newspaper press.
The conversion from CMYK to CMYK using a device link profile have more
flexibility as you can preserve individual channels, preserve black
generation, etc.
Best regards,
Lorenzo
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