How to read an inverted barcode?

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Version 10

this can be achieved by setting the value of the grayscaleTransformationModes array of furtherModes to use GTM_INVERTED

let settings = await router.getSimplifiedSettings("ReadSingleBarcode");
settings.barcodeSettings.grayscaleTransformationModes[0] = Dynamsoft.Core.EnumGrayscaleTransformationMode.GTM_INVERTED;
await router.updateSettings("ReadSingleBarcode", settings);

Version 9

Typically, normal barcode images include a dark barcode on a light background. An inverted image in this case would have a light barcode on a dark background instead. In order to read those types of barcodes, the grayscaleTransformationModes array of furtherModes must prioritize GTM_INVERTED like shown in the below example.

settings.furtherModes.grayscaleTransformationModes[0] =
  Dynamsoft.DBR.EnumGrayscaleTransformationMode.GTM_INVERTED;
await scanner.updateRuntimeSettings(settings);