Image turning into a black square.

[bsprengelmeijer]

When I try to convert the barcode below I just get a black square as ZPL

^XA ^FO294,0 ^GFA,840,840,28,!::::::::::::::::::::::::::::: ^FS ^XZ

But when I do this via labelary I do get the correct ZPL

^XA ^FO50,50^GFA,840,840,28,F30C030FC3CCFCFF3F3CFCFCFCF33F3C0C3FCC3F3C0CC033C3C0FCC!:::::::::::::::::::::::::::::^FS ^XZ

[brads07]

Did you find a solution for this? I am having the same issue when converting PNG files.

[jszczypk]

@bsprengelmeijer White areas on your image are not white, but transparent. You should convert PNG to non-transparent by adding white background as this library apparently is adding black background by default.

[parallels999]

https://github.com/andersonls/zpl

That package does it

https://github.com/andersonls/zpl/blob/b59e18dfc30171f4549c89cdaff0692beee11d24/src/Commands/GraphicField.php#L49-L50