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I am trying to use Photoshop 6.0 for four colour seperation printing the angles are very specific for screen printing,they are Yellow 97 degrees,Magenta 37 degrees, Cyan 67 degrees,& Black 7 degrees,is there a tutorial that I can read to help me on this subject?
As Tacit says, the screen angles are normally controlled by the imagesetter, and not by Photoshop. First each page is created by assembling images and text using layout software, such as PageMaker. The resulting pages are sent to a prepress facility, and the screen angles are created by a process called ripping, using a Scitex or similar machine.
http://www.onthemark.com/image.html The resulting films are then arranged, or imposed, to make a plate, and delivered to the printer. These services may be split up in different ways – for example imposition may be combined with imagesetting, with multiple pages per film. Some printers also providing the imagesetting and plate making process.
Having said all that, it is possible to split the CMYK plates to separate files, and convert each file to a bitmap, using the halftone option to set the lpi and angle. This could be useful as a student exercise, or some sort of specialized art project (silkscreen comes to mind) but never as a way to deliver a CMYK image to the printer.
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Mike Russell
www.mike.russell-home.net
