HP qms 4060 Manuale Utente

HP-GL Color 

Encoding

QMS 4060 Print System Reference

5-32

HP-GL Color Encoding

The term “pen” in the HP-GL emulation refers to a logical pen (in 
other words, the current pen position) rather than to a physical pen on 
a plotter. A pen and a pen color are selected to draw images. This 
emulation supports 8 pens and pen colors.

Since your QMS 4060 Print System is a monochrome (black and 
white) printer, the pen colors are converted to shades of gray. The 
default color mappings for the 8 pens are as follows: 

The default color for both pen 1 and pen 2 is black. However, 

the pen width for these two pens is different. Pen 1 is 0.7 mm and pen 
2 is 0.3 mm.

The printer maps each pen to its assigned color, then converts the 
color to a grayscale using the National Television System Committee 
(NTSC) standard equation for encoding color. This equation converts 
a given set of CMYK values to grayscale. For the 8 pen colors 
assigned to pens 1 - 8, the printer uses the designated grayscale; for 
any other pen color, the printer uses the following equation: 

[(C*0.3) + (M*0.59) + (Y*0.11) + K] 

÷

 255

This equation assumes that each grayscale is a byte value that 

ranges from 0 to 255 (100%). If the sum of the left-side (calculation in 
brackets) of the NTSC equation is greater than 255, then the sum is 
set equal to 255. 

v

1
2
3
4
5
6
7
8

Black
Black
Red
Green
Blue
Violet
Orange
Brown

100%
100%
70%
41%
89%
59%
25.8%
50%