Bits/index ; Bits/value (#1, #2, #3) ; Long Format - Page 138

2001/10/02 

CHAPTER 3 "PCL5C" - 8 

♣ 

Bits/index 

• 

Specifies the palette size at 2

n

. 

n

 indicates bits/index. (

n

=4 

à

 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 bla ck 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.