How to Determine Scanner DPI

[Anonymous]

Hi all
Iam wrapping twain32.dll via VB.NET 2003
I need help how to calculated DPI that supported by scanner device.
I used Canoscan N650u
I have already get value from YRESOLUTION and XRESOLUTION, and get XRESOLUTION value below :
Default : 75
MaxValue:9600
MinValue:25

and YRESOLUTION value below:
Default : 75
MaxValue:9600
MinValue:25

but on CanoScan application DPI only supported between 75DPI to 1200DPI. So i need help how to list DPI that supported by scanner device.

Thanks

[Author]

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