qr_barcode.md

QR Codes and Barcodes

• Creating a QR Code step by step

• Picture to QR code converter - Color QR picture QR codes and animated QR

• qr_image - A web app to generate valid QR codes with readable images.

• Why are QR Codes with capital letters smaller than QR codes with lower-case letters?

  • Uppercase takes less bytes!

My js decoder https://github.com/GothAck/HP-WebOS-Hack-Weekend/blob/master/server/public/javascripts/barcode.js

• Libre Barcode Project Font

  • try live on the page
  • Libre Barcode fonts enable you to write barcodes in the
    • Code 39,
    • Code 128, and
    • EAN/UPC

• Everything is an input device (fun with barcodes) Video 30min

• QRFrame - JS code-based qr code generator

• The weird history of the barcode

• The Backdooms: Running DOOM on a QR Code

  • A self-contained game that fits inside a QR code inspired by DOOM 1993 and The Backrooms

  • [minification]
  • [compression]

DATA="http://test.com" echo "data:image/png;base64,$(qrencode '$DATA' -o - | base64)"

See https://github.com/calaldees/sanicQR/tree/main

from io import BytesIO
import base64

# pip install qrcode pypng
import qrcode
from qrcode.image.pure import PyPNGImage

def get_qr_png_bytes(data: str) -> bytes:
    buffer = BytesIO()
    qrcode.make(data, image_factory=PyPNGImage).save(buffer)
    return buffer.getvalue()

def get_qr_png_base64(data: str) -> bytes:
    return b"data:image/png;base64," + base64.encodebytes(
        get_qr_png_bytes(data)
    ).replace(b"\n", b"")