c# - Convert color scan image to grayscale image for PDF417 decoder xzing -


i'm decoding pdf417 2d barcode in scanned image using zxing.net library. far, have found gray-scale scanned image(8bit depth) working fine , color scanned image(24 bit depth) not working. tried covert color scanned image gray-scale image using below method. 

 private bitmapsource convertgray(bitmapsource bi)     {         formatconvertedbitmap newformatedbitmapsource = new formatconvertedbitmap();         newformatedbitmapsource.begininit();         newformatedbitmapsource.source = bi;         newformatedbitmapsource.destinationformat = pixelformats.gray8;         newformatedbitmapsource.endinit();          return newformatedbitmapsource;      }

but, zxing.net not detect pdf417 2d barcode in converted gray-scale image. how can convert color scanned image gray-scale image same format gray-scale scanned image.


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