Add transparency support for QR code

app.py

@@ -53,7 +53,7 @@ def resize_for_condition_image(input_image: Image.Image, resolution: int, canvas
     if canvas_height is None:
         canvas_height = H
 
-    canvas = Image.new("RGB", (canvas_width, canvas_height), "white")
+    canvas = Image.new("RGBA", (canvas_width, canvas_height), (255, 255, 255, 0))
 
     # Determine the relative size of the QR code based on the canvas dimensions
     qr_scale_ratio = 768 / min(1024, 768)  # Base ratio (relative to 1024x768)
@@ -66,7 +66,7 @@ def resize_for_condition_image(input_image: Image.Image, resolution: int, canvas
     # Paste the resized QR code 2/3rds of the way over the canvas
     qr_x = int(canvas_width * (2 / 3)) - (W // 2)  # Adjust x-coordinate to 2/3 of the canvas
     qr_y = (canvas_height - H) // 2  # Center the QR code vertically
-    canvas.paste(input_image, (qr_x, qr_y))
+    canvas.paste(input_image, (qr_x, qr_y), input_image)
     return canvas
 
 
@@ -116,8 +116,8 @@ def inference(
         )
         qr.add_data(qr_code_content)
         qr.make(fit=True)
-
-        qrcode_image = qr.make_image(fill_color="black", back_color="white")
+        
+        qrcode_image = qr.make_image(fill_color="black", back_color=None).convert("RGBA")
         qrcode_image = resize_for_condition_image(qrcode_image, 768, width, height)
     else:
         print("Using QR Code Image")