zxing- QRCode decoding issue

I installed zxing application in our Linux server. I used that for decoding the qrcode from the scanned copy of the signatu开发者_Python百科re sheet which our tutors uploading through php script. Few picture quality it can decode and few it can not.

Can anybody tell me which format or resolutions it can work 100%.

---

Nothing works 100%. All resolutions are scannable by the library, within reason. The supported formats are:

• UPC-A and UPC-E
• EAN-8 and EAN-13
• Code 39
• Code 93
• Code 128
• QR Code
• ITF
• Codabar
• RSS-14 (all variants)
• Data Matrix
• PDF 417
• Aztec

---

If you have the choice, prefer lossless formats: BMP, GIF, PNG. But this no warranty that it will always work well.