GS1 defines a huge range of application identifiers that can be used to encode certain information in a barcode. Besides the Global Trade Item Number (GTIN), which is usually the most important part, the production date, packaging component number, count of items and many more application identifiers (AIs) are defined.
Through a cooperation with REA, a renown vendor of barcode verifiers, we were able to grade and improve our barcodes according to the usual ISO standards. Amongst other optimizations we completely changed the rendering algorithm to optionally match the bars exactly to the device pixels, eliminating all rounding effects this way. Typically, at least a grade of "B" is required by barcode consuments. This should now be easily achievable on typical hardware.