Re(2): color management implementation, was: Embedding CMYK profiles
Re(2): color management implementation, was: Embedding CMYK profiles
- Subject: Re(2): color management implementation, was: Embedding CMYK profiles
- From: Olaf Drümmer <email@hidden>
- Date: Mon, 7 Jun 2004 09:22:23 +0200
email@hidden wrote Sun, 6 Jun 2004 21:55:17 -0400
>
One could even argue what really constitutes "printing what you gave
>
me" or "printing the numbers in the file". If a printer doesn't perform
>
a profile conversion but if they're using plate curves before it gets
>
to press, are they technically still printing to the numbers in the
>
file? IOW, if my image asks for 50% but the plate curve has bumped the
>
50% dot to 54% to compensate for dot gain/loss, then have they printed
>
my image "untouched"?
You are always preparing for a printing condition, not for just a plate
setter, or just a press, or just a paper type. It's the combination of
many aspects that contribute to a printing condition:
- press
- paper
- ink
- plate
- ...
For most of the officially specified (SWOP) or standardized (ISO 12647)
printing conditions, tone value increase is between 15 (commercial) and
30 (news print) percent. That means that if you are printing according to
them, you are never ever getting the percent value you have in the file
on the output (except for 0 and 100 %). There is always a well specified
TVI involved.
Main point: it does not matter at all what gradation curve as such
happens to be active in a RIP. It's rather that the overall behavior of
the printing process must meet a chosen specification/definition. Setting
up gradation curves properly is just one aspect of that, choosing the
right ink or what have you is another aspect.
Olaf Druemmer
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