
Epson Research and Development
Page 21
Vancouver Design Center
Programming Notes and Examples
S1D13706
Issue Date: 01/02/23
X31B-G-003-03
4 bpp gray shade
The 4 bpp gray shade mode uses the green component of the first 16 LUT entries. The
remaining indices of the LUT are unused.
8 bpp gray shade
When configured for 8 bpp gray shade mode, the green component of all 256 LUT entries
may be used. However, the green component alone only provides 64 intensities (6 bits).
16 bpp gray shade
The Look-Up Table is bypassed at this color depth, therefore programming the LUT is not
required.
As with 8 bpp there are limitations to the colors which can be displayed. In this mode the
six bits of green are used to set the absolute intensity of the image. This results in 64 gray
shades.
Table 4-4: Suggested LUT Values for 4 Bpp Gray Shade
Index
Red
Green
Blue
00
00
00
00
01
00
10
00
02
00
20
00
03
00
30
00
04
00
44
00
05
00
54
00
06
00
64
00
07
00
74
00
08
00
88
00
09
00
98
00
0A
00
A8
00
0B
00
B8
00
0C
00
CC
00
0D
00
DC
00
0E
00
EC
00
0F
00
FC
00
10
00
00
00
...
00
00
00
FF
00
00
00
Unused entries