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Print Contrast Signal. A measurement of the ratio of the reflectiveness between the bars and spaces of a symbol, commonly expressed as a percent. PCS is calculated as:

PCS = (Rw – Rb) / Rw

Rw = reflectance of the white bar
Rb = reflectance of the black barThe minimum value of PCS differs by the value of Rw (reflection rate in this case is against red light at 660 nanometer wave length.)

(See MRD)

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