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How-to Guides - Read Barcodes with Different Colours
Common barcodes are black and white. However, some barcodes could be in different colors such as the below left barcode. Also, in some cases, a QR code may appear with an image or a logo inside as shown below right. Dynamsoft can decode such special barcodes as well.
In some other cases, the barcodes can be white with a dark background color as shown on the right part of the image below:
To decode such kind of barcodes, the default runtime settings may fail. You can adjust the PublicRuntimeSettings like below:
char sError[512];
TextResultArray* paryResult = NULL;
PublicRuntimeSettings* runtimeSettings = new PublicRuntimeSettings();
CBarcodeReader* reader = new CBarcodeReader();
//Initialize license prior to any decoding
//Replace "<Put your license key here>" with your own license
reader->InitLicense("<Put your license key here>");
//Change the runtime settings to read both normal and inverted barcodes
reader->GetRuntimeSettings(runtimeSettings);
runtimeSettings->furtherModes.grayscaleTransformationModes[0] = GTM_ORIGINAL;
runtimeSettings->furtherModes.grayscaleTransformationModes[1] = GTM_INVERTED;
reader->UpdateRuntimeSettings(runtimeSettings, sError, 512);
//Replace "<Put your file path here>" with your own file path
reader->DecodeFile("<Put your file path here>", "");
// If succeeds
reader->GetAllTextResults(&paryResult);
CBarcodeReader::FreeTextResults(&paryResult);
delete runtimeSettings;
delete reader;
See Image Scale and Colour Conversion for more information about what you can do during image pre-processing.
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