I'm trying to print color separations as a Postscript file from Illustrator CS5 and the halftone areas keep showing up as grayscale instead of the specified frequency and angle. I've tried usiing multiple PPDs and options but I'm having no luck.
Not sure what you are saying here. A separation is for all intents and purposes just a greyscale representation of the ink's intensity/ saturation and distribution on the plate. The actual rasterization is applied by whatever is interporeting the file on the other end, i.e. a RIP hardware/ printer. If the printer supports custom screening angles, it will read the meta info attached to the objects and rasterize them accordingly, if noit, it will simply use its default screen.
I've been trying to print actual halftone separations as a postscript file. I've tried using multple PPDs, the host-based separation option, and halftone settings but the postscript file only gives me a multipaged grayscale document.
This used to work just fine, but for some reason, it recently changed. I'm not sure if it was when I upgraded to CS5 or the new MacOS.
Sounds like you were expecting to get each seperation in it's respective color not in grayscale. The tags are still there for color information, so there is nothing wrong with your separations being in grayscale, sounds like you are having trouble with controlling the angle.
Something has changed in either how you are viewing you PS files, or how you are creating them.
How are you previewing the PS files? On the scitex for example you could preview seperation in either grayscale or their own channel, there was a settign to change. really helped on yellow plates which are hard to see against white.
How exactly are you making your PDFs, need to be able to trace your exact steps?
Nope, I have no expectation to see anything except what I've been seeing for several years now—halftone separations. I, and an art department of almost 20 people, have been viewing (in Preview and Acrobat) and printing (to several different laser printers) postscript files as seps with the correct frequency and angles. This has been an integral step in our proofing process that somehow changed with either the latest version of Illustrator or MacOS. We have had to change our print settings to rely on the rip for our frequency and angle but our print process rely needs to be Host-Based. Unfortunately, Host-Based no longer yields the correct frequency and angles but gives us grayscale.
It's my understanding that the postscript settings changed somehow in either the program or the OS. How do I change or override the Adobe Postscript printer settings to allow Host-Based halftone separations, like have been possible for many many years.
I'm having this exact same problem. I'm on a Mac running Lion (OS 10.7.4), working in Adobe Illustrator CS5, and trying to print color seps to our Epson Stylus Pro 9900. Since I can no longer print to PDF (as with older versions of Illustrator), I print to Adobe PostScript File using my Epson 9900 PPD. I then select Output on the left-hand sidebar menu, which gives me the list of inks available to print. I'm outputting positive film for tshirt screen printing, so for the ink I need I'm setting the Frequency to 40 and the Angle to 17.5. I then save the postscript file, put it through Distiller, and print to the Epson from the resulting PDF.
When the film is finally out (this is a lot of time and too many steps, IMHO), the screened areas of ink are not halftone dots, they are solid greys. This means that the Frequency and Angle settings I input for the postscript file were ignored when printed. Is this a PPD issue? A driver issue? An Illustrator issue? An operating system issue?
No, we have no RIP software. Never needed it until the CS5 + Mac OS 10.7.4 combo came along. I'm trying to figure out whether I can expect Adobe to release an updated PPD that will fix this, or whether now I have to go buy RIP software because Illustrator no longer functions as it did previously.
When I use that method and try to save as a PDF, I get "The Save as PDF options in the Printer dialog are not supported." I can save as a postscript file by that method, but I can do that right from the main print dialog box. :-(
No news on my end. I'm calling Adobe support again and will post if I get any good news, such as, "We heard you and made a new PPD - download it here!" This is maddening. Not an issue on PCs, of all things.