Bits/index ; Bits/value (#1, #2, #3) ; 2) Long - Page 146

CHAPTER 3 PCL5C - 8 

♣

Bits/index 



Specifies the palette size at 2

n

. 

n

 indicates bits/index. (

n

=4 



 2

4

=16 palettes) 



When the encoding mode is 0 or 1, the palette size selected by the bits/index value specifies the range of the 
index No., which can be used for raster data. 



The values specified by the encoding mode are listed below; 

Encoding Mode 

Bits/Index 

0 0,1,2,3,4,5,6,7,8 
1 1,2,4,8 
2 1 
3 8 

♣

Bits/value (#1, #2, #3) 

Each value indicates a color as follows; 

#1: red 
#2: green 
#3: blue 



When the encoding mode is 0 or 1, it ignores this setting.    The black/white reference, described later, is set. 



When the encoding mode is 2, it shows the number of planes that are required to send each color. 



When the encoding mode is 3, it shows the number of bits that are required to send each color. 



It sets the black reference to 0.    (Valid when the Encoding mode is 0 or 1.) 



It sets the white reference to 2

n

-1.    (Valid when the Encoding mode is 0 or 1.) 

2) Long 

Format 

 MSB 

LSB 

0 - 1 

Format (0) 

Encoding mode 

2 - 3 

Bits / index 

Bits / value #1 

4 - 5 

Bits / value #2 

Bits / value #3 

6 - 7 

White reference for value #1 

8 - 9 

White reference for value #2 

10 - 11 

White reference for value #3 

12 - 13 

Black reference for value #1 

14 - 15 

Black reference for value #2 

16 - 17 

Black reference for value #3 

The long format allows you make the setting of the white/black reference in addition to the ones available in the 
short format. 

♣

White reference for value #1, #2, #3 



This mode specifies the white value (the lowest level of density). 



Each value indicates a color as follows; 

#1: red 
#2: green 
#3: blue 

Range: -32767 ~ 32767 



When the encoding mode is 2 or 3, this setting is valid.