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metafloor / bwip-js

Barcode Writer in Pure JavaScript
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the quality of result png is not right for a gs1-128 barcode #22

Closed leafred closed 8 years ago

leafred commented 8 years ago

I tried this: http://api-bwipjs.rhcloud.com/?bcid=gs1-128&text=(019931265099999891SHW400000101000600206)&scaleX=1&scaleY=2

I also used my own nodejs in ubuntu server, got the same result.

I printed the barcode, the quality is poor in thermal printer, cannot be scanned, Is there anything to be configured?

Thanks.

terryburton commented 8 years ago

The library takes care of encoding the data into GS1 Application Identifier standard format so you should provide the input with the brackets around the AIs, as follows:

(01)99312650999998(91)SHW400000101000600206

leafred commented 8 years ago

Thanks for your reply, this is good point for me, however the quality I mentioned is that the PNG barcode image is too rough in printing, I tried to convert it to JPG, then it solved the problem. I don' t know the reason.

metafloor commented 8 years ago

PNG is a lossless image format whereas JPEG is lossy, so the image format is most likely not the cause. Are you using a browser for printing? Or some other 3rd party software that might understand the JPEG format better than PNG? Are you setting the size of the image when printing or letting it default to the image's native size?

leafred commented 8 years ago

I did not resize the image, used php tcpdf to insert barcode image as a part of PDF shipping label. I also tried print from Chrome browser, the result is the same.

leafred commented 8 years ago

I realised it happened in Chrome browser, there is no problem if I save the pdf to computer disk then open with pdf reader and print in Windows. For our case we have to print in Chrome, bswip-is is very good indeed, it is not perfect for us as we have to convert png to jpg.

metafloor commented 8 years ago

Closing this issue as I believe it is resolved.