Set Image DPI

Image Resolution can only be modified, or set, after a TWAIN Session has been opened (OpenSession), and prior to initiating the scanning session (StartSession).

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.

It is important to set the ICAP_UNITS capability equal to TWUN_INCHES prior to setting the resolution capabilities.

C# Example	Copy Code
// This code demonstrates how to set the DPI of scanned images to 300 DPI Accusoft.TwainProSdk.CapabilityContainerOneValueFloat myCap = new CapabilityContainerOneValueFloat(Capability.IcapUnits); myCap.Value = (float)Accusoft.TwainProSdk.CapabilityConstants.TwunInches; twainDevice.SetCapability(myCap); myCap = new CapabilityContainerOneValueFloat(Capability.IcapXResolution); myCap.Value = 300; twainDevice.SetCapability(myCap); myCap = new CapabilityContainerOneValueFloat(Capability.IcapYResolution); myCap.Value = 300; twainDevice.SetCapability(myCap);

C# Example

Copy Code

// This code demonstrates how to set the DPI of scanned images to 300 DPI
Accusoft.TwainProSdk.CapabilityContainerOneValueFloat myCap = new CapabilityContainerOneValueFloat(Capability.IcapUnits);
myCap.Value = (float)Accusoft.TwainProSdk.CapabilityConstants.TwunInches;
twainDevice.SetCapability(myCap);
 
myCap = new CapabilityContainerOneValueFloat(Capability.IcapXResolution);
myCap.Value = 300;
twainDevice.SetCapability(myCap);
 
myCap = new CapabilityContainerOneValueFloat(Capability.IcapYResolution);
myCap.Value = 300;
twainDevice.SetCapability(myCap);