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Choosing The Correct Enshroud Angle For Over-Printing Topographic Point Colors

To make upwards one's remove heed which enshroud angle to role when a screened PMS Choosing the correct enshroud angle for over-printing spot colors
To make upwards one's remove heed which enshroud angle to role when a screened PMS/spot color overprints a 4/C procedure ikon y'all volition postulate to expect carefully at the ikon that y'all volition last overprinting.

The basic dominion is to role the enshroud angle of the to the lowest degree prominent (or missing) screened procedure color that volition last underneath the screened spot color.

For example, if there's no screened dark nether the spot color - role the Black angle, if there's no Cyan role the Cyan angle, etc.

Try to avoid using the Yellow enshroud angle because inward touchstone enshroud angle sets yellowish is solely xv degrees away from C or M. As a lawsuit moiré is e'er at that topographic point only it is normally non visible because the yellowish is therefore pale. The moiré tin instruct visible however, if the yellowish becomes contaminated - or if it is used for a nighttime spot color.

For example, inward the graphic below, the left ikon is Cyan (at 105°) overprinted alongside procedure Yellow at the touchstone 90°. The moiré is barely visible. However, inward the middle ikon overprinting Cyan alongside PMS 144 – a real nighttime yellow/orange color – using the same Yellow enshroud angle results inward the existing moiré becoming real visible. On the right, PMS 144 uses the Magenta enshroud angle (75°) instead which eliminates the halftone moiré seen inward the middle image.
To make upwards one's remove heed which enshroud angle to role when a screened PMS Choosing the correct enshroud angle for over-printing spot colors
Alternatively, y'all could effort running the fifth color using a mo social club FM screen. If you're using a 175 lpi AM/XM enshroud as well as then the FM should last nearly 35 micron because if it's whatsoever finer you'll postulate to make dot gain compensation curves for the FM. Because 35 micron is a fairly coarse enshroud it is best used for fairly low-cal colors otherwise y'all may notice that the enshroud is besides visible.

Because spot/PMS colors are typically formulated to last printed enterprise as well as non halftone screened, brand certain that your ink vendor knows that y'all are going to last screening the ink as well as the dot size gain every bit good (either inward microns or lpi) therefore that they tin formulate the inks accordingly.
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