Справочник Пользователя для Zebra Technologies P640i

980541-001 Rev. A

P640i Card Printer User Guide

63

The Brightness and Contrast controls here have same 
effect on the printed image as do similar controls on 
typical office color printers. Click Reset to restore 
default conditions. 

When the Card Setup screen (page TN8-1) is set for 
YMC (Color) 

 K (Black) on the 

 of a card, a 

process called “Black Extraction” is enabled (see inset 
panel, right). The K (Black) Panel screen, below, 
displays available options for Black Extraction. 

Black extraction has to do with the way the printer 
driver handles the K (black) panel. It applies 

 to 

surfaces of the card on which 

 YMC (color) 

 K 

(black) are to be printed.

Equal amounts of Y, M and C dyes, at maximum 
intensity, deliver a near-black image, but one which is 
not machine readable. For example, a bar code printed 
from YMC (color) will be visible to the eye, but will 
not be detectable by most bar code readers. The 
remedy for this is to “extract the black”; in other 
words to print the same bar code, using the K (black) 
panel, on top of the YMC bar code. (You can also 
choose to print only in K, omitting YMC from that 
region.)  The K (black) panel is not a dye. It is more of 
a paint containing carbon black, which is highly 
visible to infrared-type readers.

Printing Preferences