The prepress should really look after the screen angles.
Can you ask them what they want you to do?
I did ask on behalf of the client about what they wanted and didn't get a proper answer, so I am perhaps a little worried that they aren't grasping the nature of the problem.
If your printer doesn't know how to set screen angles for a duotone, then you should look for another printer.
If you send plates from ID, it will default that 125 swatch to the same 45 angle as the black which is the worst case scenerio. set the angle to 15 or 75.
Feels like the problem is in communication - it's a publishing house in HK and English isn't the primary language.
My preference was for them to set angles, as it's their machine, but failing that, a simple 'You set it yourself' would have been the go. I did ask what they would like me to set at, and the answer I got second hand was '30 degrees', which I did deduce as black @ 40 degress, PMS 125 30 degrees off.
Steve, we've seen their work and it's pretty good, so pretty sure it's just a communication breakdown.
If I use 'Print' in ID, is that the best way to set angles? Does that hangle image compression and line art as good as the 'Export' function? And does it crop image data to frames, to keep the size managable?
Thanks guys, appreciate the wisdom/warnings.
Personally, I set screen angles for duotones in PS and save out as a DCS EPS and check the appropriate box--and as I always adjust the curves, I also check that box as well. I generally use 45 k and 75 Ptone as Daniel suggests.
Take care, Mike
My postscript printers ignore any screens or transfer curves saved with an EPS file—the angles I set in the print dialog are always used when I print separations. Angles don't get save in print presets, so I don't there's a way to set screen angles and frequencies on your end that would make it through production downstream.
Thanks guys, it seems they are happy to sort that out for us; will double check the proof though! I just thought it might pay to be cautious before we get 1,000 books of mush.