When I use 'gen_data.py' to generate data, why do I get a black logo_resisize. png?

[MtYCNN]

The code in 'gen_data.py' is as follows:
img_logo = Image.new('L', (opts.logo_size, opts.logo_size))
img_logo.save(os.path.join(opts.output_dir, opts.split, cid, 'logo_resized.png'))

See what this means is that it just saves a black image and doesn't add anything else. But in the data set, logo_sized.png is just an image with white text on a black background

Is there any part left out？