Can not trace exactly QRcode Image

[huynhnhathoangit]

Can not trace exactly QRcode Image, there is an error inside QRCODE image when trace it.

[jankovicsandras]

Hi,

I tested this command below and it gave me an acceptable SVG of the QR code. Can you please explain the problem with more details?

java -jar ImageTracer.jar qr.png

[huynhnhathoangit]

Hello @[jankovicsandras]
Thanks for your reply.
I problem is the output SVG file of QR code was broken and can not SCAN,
As you can see, the left side is origin QR code can Scan with camera: value: 0, but the right side have error some part inside, so can not scan.

[jankovicsandras]

Yes, I see your problem: some white square "holes" are filled black on the right side, which destroys the QR code. I guess the problem is with the colors: the source might have transparency instead of white, and despite ImageTracer probably can trace these "hole" squares correctly, this older Java version is using stack based rendering, which means transparent on top of black is still black.

See also imagetracerjs Issue Seven
This is fixed in imagetracerjs 1.2.0 , but this Java version is 1.1.2 . I'm planning to port this fixes to the Java versions, but I don't know when I will have time.

Despite all of this, I still got acceptable result by saving your left side PNG, and tracing with the command above, so you might be able to fix this also with another color palette.

Can you please upload this right side image as the SVG result from ImageTracer (so do not convert it to PNG)?