Each of the option provide different result and has its own setting.
Static Threshold - Brightness, Threshold and Contrast are allowed to change
SDTC mode - Only Brightness and Contrast are allowed to change. Threshold is disabled
Advanced DTC - Only Threshold are allowed to change. Brightness and Contrast is disabled
Is it possible to control which option to use for Twain acquisition? Please advise.
Unfortunately this feature is not defined in TWAIN specification.
What you can do is to contact the scanner provider to ask which capability ID they are using to control this feature. Then,you will be able to manage it through the TwainSetCapCurrentNumeric method.
With best regards,
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