Microsoft 9.19 User Manual

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4.7.3  Generic 
 
Figure  Option dialog (Generic) 
♦ Unit/Scaling 
 
This option selects the unit for the scanning area and preview window.  One inch is 
calculated as 25.4 millimeters.  When inches are converted to millimeters, values are 
rounded off.  
Note.  
The TWAIN specifications require that the data width be arranged in units of 32 bits.   
As a result, a difference of up to 31 dots can be included, depending on the value set.