Hello all,
Management wants to create new compensation curves by printing P2P charts for CMYKOGV and they want to output the OGV as stochastic (FM). Just wondering if running P2P’s as stochastic is common practice? Aren't they supposed to be printed with an AM screen?
Thanks
Hello all,
Management wants to create new compensation curves by printing P2P charts for CMYKOGV and they want to output the OGV as stochastic (FM). Just wondering if running P2P’s as stochastic is common practice? Aren't they supposed to be printed with an AM screen?
Thanks
It's more complicated than just building curves.
A few thoughts:
- If you intend to print the OGV inks FM then why not print the CMYK inks FM? - I believe the main purpose is to avoid moiré patterns
- Are you using the extra inks to enhance images or simulate spot colors or both? - just to simulate spot colors
- Most offset shops that I've worked with do not load the press with all 7 inks. Instead, they use 6 and just replace one of the 6 as needed by the job. - we combo our runs, so usually we’re running orange violet and green.
- You need to make sure that the inks used for OGV are designed to run as "process" colors (i.e. be screened and wet trapped). This is a major point of failure and can be exacerbated with FM screening.
Examples of inks (solid and screened) formulated correctly (left) for the O printer vs inks not properly formulated (right) and just the screen (badly formulated) - as much as I would love to be, I am not involved in the formulation of the inks so I can only assume they are correct. We have an ink department within the press room, occupied by a representative from the ink company so I have to assume they know what they are doing.
Thanks
Thank you all for the detailed info.
I knew the word “assume” would cause some sparks lol...
Since we run a lot of combo runs, there seems to always be one or 2 units that need a little help, ie, bring up the magenta in the midtones by 5%, reduce the yellow in the quarter tone 10%, etc. We are asked quite frequently to make curve adjustments while the job is on press.
Management feels that with a stochastic screen, we won’t be able to make on the fly curve adjustments as easily as with a conventional screen.
That is the reason we don’t plan on going FM on every color. Which leads me back to the direction of my original question... how can a color with an FM screen be manipulated on the fly? Let’s say the violet needs a boost on press, can it be boosted using a compensation curve?
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