Epson GT-6500 EN - Manual (Page 132)

Explanation:
This command sets the brightness level of the scanned image data.
Seven values for i are available: 00
H
, 01
H
, 02
H
, 03
H
, FF
H
, FE
H,
and
FD
H
.
The graph below shows the differences between the brightness
settings when gamma correction is set for the CRT Display A setting.
Note:
The brightness parameter is not available if a user-defined gamma
correction table (see ESC Z) is selected.
3-38 Command Reference