Update app.py

app.py

@@ -14,13 +14,13 @@ MIN_SIZE = 200
 def calc_size(payload_bytes):
     total_bits = (len(payload_bytes) + 4) * 8
     pixels_needed = math.ceil(total_bits / 6)
-    side = max(MIN_SIZE, math.ceil(math.sqrt(pixels_needed * 1.15)))
+    side = max(MIN_SIZE, math.ceil(math.sqrt(pixels_needed * 1.6)))
     return side, side
 
 def make_base_image(w, h):
     img = Image.new("RGB", (w, h), BG_COLOR)
     draw = ImageDraw.Draw(img)
-    font_size = max(20, min(w, h) // 5)
+    font_size = max(10, int(min(w, h) * 0.40))
     try:
         font = ImageFont.truetype("/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf", font_size)
     except:
@@ -70,7 +70,7 @@ def embed(payload):
     data = header + payload
     bits = bits_from_bytes(data)
     if len(bits) > len(carriers) * BITS_PER_CHANNEL * 3:
-        raise ValueError("Data too large even for max canvas.")
+        raise ValueError("Data too large even after sizing. Try compressing your file.")
     pixels = img.load()
     bit_idx = 0
     for (x, y) in carriers:
@@ -138,10 +138,7 @@ def encode_file():
     if len(raw) > MAX_BYTES:
         return jsonify({"error": f"File too large: {len(raw)/1024/1024:.2f}MB. Max is 5MB."}), 400
     fname = f.filename or ""
-    if fname.endswith(".pdf"):
-        mode = b'\x02'
-    else:
-        mode = b'\x01'
+    mode = b'\x02' if fname.lower().endswith(".pdf") else b'\x01'
     payload = mode + raw
     try:
         img = embed(payload)