One capability that is often set by the application is the desired DPI of the scanned image. To set the DPI for scanned images, use the TWAIN capabilities: ICAP_XRESOLUTION and ICAP_YRESOLUTION.
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It is important to set the ICAP_UNITS capability equal to TWUN_INCHES prior to setting the resolution capabilities. |
VB Example |
Copy Code
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' This code demonstrates how to set the DPI of scanned images to 300 DPI
TwainPRO1.Capability = ICAP_UNITS
If TwainPRO1.CapSupported Then
TwainPRO1.CapTypeOut = 0
TwainPRO1.CapValueOut = 0
TwainPRO1.SetCapOut
End If
TwainPRO1.Capability = ICAP_XRESOLUTION
If TwainPRO1.CapSupported Then
TwainPRO1.CapTypeOut = 0
TwainPRO1.CapValueOut = 300
TwainPRO1.SetCapOut
End If
TwainPRO1.Capability = ICAP_YRESOLUTION
If TwainPRO1.CapSupported Then
TwainPRO1.CapTypeOut = 0
TwainPRO1.CapValueOut = 300
TwainPRO1.SetCapOut
End If
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Image Resolution can only be modified, or set, after a TWAIN Session has been opened ( OpenSession), and prior to initiating the scanning session ( StartSession).
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See Also