Re: Changing inks
Re: Changing inks
- Subject: Re: Changing inks
- From: Jim Rich <email@hidden>
- Date: Wed, 01 Mar 2006 10:56:15 -0500
- Thread-topic: Changing inks
One of the first places I would suggest to start would be to use colorimetry
to measure the LCH values of the solid inks of all processes to find out how
they compare. If you have a spectro this will take about 10 minutes to take
all of the measurements.
Specifically, you want the Chroma of each CMY color of the proofers to be
slighter higher than the Chromas of each CMY ink on your press. And the L-
luminance and Hues should be similar on the proofers and the press.
Also, you should look at the lowest L values of the blacks to see how they
compare. What you might find is that the Fuji Final Proof might have a very
low L value say of 5. And the press might have a low L value of 10. And the
Inkjet printer might have a low l value of 12. In that case, the inkjet
printer cant give you the same visual match in blacks for the press or the
Fuji proofer. One solution would be to use better paper in the inkjet
printer, but that might only get the L value to 8 or 9.
Once you find out this information then to help you make better decisions
about the relationship of the proofers ink sets to your press.
Also, I am just curious as to why it matters if your company uses exact
halftone dot values on a prepress proof? I can understand why a press person
might care about having exact dot values on a prepress proof but, it seems
to me that it is the appearance of the proof is what matters.
However, I find that a number of printing companies are moving away from dot
proofs because all they care about is the appearance of the proof and they
are cheaper to create.
Any thoughts on that?
Jim Rich
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| | >Changing inks (From: Patrick Donigain <email@hidden>) |