var instance = new Vintasoft.Twain.WebTwainDeviceJS(deviceName, productFamily, manufacturer, driverVersion, twainVersion, deviceManager, is64Bit);

var value; // Type: Vintasoft.Twain.WebTwainCapabilitySupportedValuesJS
value = instance.getSupportedContrastValues();

function getSupportedContrastValues() : WebTwainCapabilitySupportedValuesJS;

Return Value

This function sends a synchronous request to get supported values of WebDeviceCapabilityIdEnumJS.IContrast capability. If you want to use asynchronous request instead of synchronous request, please get information about WebDeviceCapabilityIdEnumJS.IContrast capability using WebTwainDeviceJS.getCapabilityAsync function.

Reference

WebTwainDeviceJS Class
WebTwainDeviceJS Members