https://github.com/ameisso found an issue (probably on MacOS?)

The script keeps crashing when I export PNG from photoshop even if the finder gives me the right size.
This is correcting the issue
https://github.com/jnweiger/led-name-badge-ls32/pull/20

I am picking the one line important line, that should fix it.

led-badge-11x44.py

@@ -335,7 +335,7 @@ def bitmap_img(file):
       for bit in range(8):      # [0..7]
         bit_val = 0
         x = 8*col+bit
-        if x < im.width:
+        if x < im.width and row < im.height:
           pixel_color = im.getpixel( (x, row) )
           if isinstance(pixel_color, tuple):
             monochrome_color = sum(pixel_color[:3]) / len(pixel_color[:3])