I have not been able to find out why, but sometimes when I generate QR codes of a certain size and with the rounded squares I get these white lines between the cells. It only happens when I use the RoundedModuleDrawer to change the shape of the cells. Here are examples of the same QR code, just different Box_size:
Box size 23
Box size 24
Here are the functions I made:
def generate_qr_code(self):
text = self.input_box.toPlainText()
save_path = self.save_path_field.text()
box_size = self.box_size_slider.value()
# Define QR code settings
qr = qrcode.QRCode(
version=1,
error_correction=qrcode.constants.ERROR_CORRECT_H,
box_size=box_size,
border=2, # Set the border size here. Smaller value = smaller border.
)
icon_path = os.path.join(bundle_dir, 'resources', 'MunuAppLogo-1500x.png')
for i, line in enumerate(text.split('\n'), start=1):
if line: # Skip empty lines
qr.clear() # Clear the previous QR code
qr.add_data(line)
qr.make(fit=True)
img = qr.make_image(
fill_color="black",
back_color="white",
image_factory=StyledPilImage,
module_drawer=RoundedModuleDrawer(),
eye_drawer=RoundedModuleDrawer(),
).convert('RGB')
# Load the icon image
icon = Image.open(icon_path)
# Resize icon to fit in the QR code
img_w, img_h = img.size
factor = 3 # Factor to size down the icon, adjust as needed.
icon_w = img_w // factor
icon_h = img_h // factor
icon = icon.resize((icon_w, icon_h), Image.Resampling.LANCZOS)
# Calculate position to place the icon (center)
w_pos = (img_w - icon_w) // 2
h_pos = (img_h - icon_h) // 2
# Paste the icon onto the QR code
img.paste(icon, (w_pos, h_pos), icon)
file_path = os.path.join(save_path, f'qr_code_{i}.png')
img.save(file_path)
QMessageBox.information(self, "Success", "QR codes generated successfully!")
def update_box_size_label(self):
input_text = self.input_box.toPlainText() # Get the current text input
first_line = input_text.split('\n', 1)[0] if input_text else "" # Get only the first line
input_length = len(first_line) # Calculate the length of the input
estimated_version = self.estimate_qr_version(input_length) # Estimate the QR version
if estimated_version is None:
self.box_size_label.setText("Input too long for estimation")
return
# Assuming a fixed border size of 4 modules
border_size_modules = 4
box_size = self.box_size_slider.value()
# Calculate the number of modules for the estimated version
qr_code_version_modules = 21 + (estimated_version - 1) * 4
image_size_pixels = ((qr_code_version_modules * box_size) + (2 * border_size_modules * box_size))
print(f"Box size = {box_size}")
print(f"Input length = {input_length}")
# Update the label to display the estimated total image size in pixels
self.box_size_label.setText(f'Estimated Image Size: {image_size_pixels}x{image_size_pixels} pixels')
def estimate_qr_version(self, input_length, error_correction='H'):
# Simplified capacity for alphanumeric mode with error correction level H
capacities = [
(15, 1), (25, 2), (35, 3), (45, 4), (59, 5),
(65, 6), (85, 7), (99, 8)
]
for capacity, version in capacities:
if input_length + 1 <= capacity:
return version
return None # Return None if input is too long for estimated capacities
I have not been able to find out why, but sometimes when I generate QR codes of a certain size and with the rounded squares I get these white lines between the cells. It only happens when I use the RoundedModuleDrawer to change the shape of the cells. Here are examples of the same QR code, just different Box_size:
Box size 23
Box size 24
Here are the functions I made: