document on how to create a QR code with qrencode and imagemagick

posts/2024-11-03-create-a-qr-code-from-the-command-line.md

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+Date: 2024-11-03
+Title: Create a QR code from the command line
+Tags: QR code, Tools, TIL
+
+Lindsay, my wife, has been working on her [online shop (gestempelt & gedruckt — unique handicrafts inspired by nature)](https://gestempelt-und-gedruckt.ch/) for the last few months. Now that it’s complete, she's eager to get the word out with flyers. For this, she needed a QR code with the shop's URL to make it easier for people to scan.
+
+So how do you generate a white QR code with the rest being transparent without needing to sign up to a website?
+
+Use [qrencode](https://fukuchi.org/works/qrencode/) and [ImageMagick](https://imagemagick.org/) on the command line.
+
+First, install the applications using:
+
+```bash
+brew install qrencode imagemagick
+```
+
+Then, generate the QR code:
+
+```bash
+# Create the QR code (white on black).
+qrencode -s 20 --foreground=ffffff --background=000000 -l H -o "URL.png" "https://gestempelt-und-gedruckt.ch/"
+
+# Replace black with "transparent".
+convert URL.png -fuzz 10% -transparent black URL_transparent.png
+```