grey 4bit/pixel

hi, 
 
iam searching a scanner that supports at about 300 dpi and 4
bit /pixel grey 
scanner. i found from the scanner that most of the scanner
support 8/16 bit 
depth in grey mode. 
 
is there any way to modify this code to support 4 bit grey
scale depth per pixel. 
 
all suggestions are welcome 
 
with regards 
 
Shashi krishna 


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