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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 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.