fix composition

app.py

@@ -32,7 +32,7 @@ def make_code128(data: str) -> Image.Image:
             "module_width": 0.5,  # bar thickness
             "quiet_zone": 1.0,  # margin on each side
             "font_size": 10,  # text size
-            "text_distance": 1.0,  # gap between bars and text
+            "text_distance": 5.0,  # gap between bars and text
             # you can also pass 'format': 'PNG' here if needed
         },
         text=data,  # explicitly draw your data string under the bars
@@ -59,15 +59,36 @@ class PrintRequest(BaseModel):
 
 
 def compose_label(images: List[Image.Image]) -> Image.Image:
+    """
+    Horizontally stack each barcode image with padding,
+    first scaling them all to the same height.
+    """
     border, spacing = 10, 20
-    framed = [ImageOps.expand(img, border=border, fill="white") for img in images]
-    max_h = max(img.height for img in framed)
-    total_w = sum(img.width for img in framed) + spacing * (len(framed) - 1)
 
-    canvas = Image.new("1", (total_w, max_h), 1)
+    # 1) Determine target inner height (max of original heights)
+    inner_h = max(img.height for img in images)
+
+    # 2) Scale each image to inner_h, then frame it
+    framed = []
+    for img in images:
+        w, h = img.size
+        new_w = int(w * inner_h / h)
+        # high-quality up-scaling
+        img_scaled = img.resize((new_w, inner_h), Image.LANCZOS)
+        # add white border
+        framed_img = ImageOps.expand(img_scaled, border=border, fill="white")
+        framed.append(framed_img)
+
+    # 3) Compute final canvas size
+    total_w = sum(img.width for img in framed) + spacing * (len(framed) - 1)
+    final_h = inner_h + 2 * border
+
+    # 4) Create canvas and paste each framed image
+    canvas = Image.new("1", (total_w, final_h), 1)
     x = 0
     for img in framed:
-        y = (max_h - img.height) // 2
+        # vertical center (though they’re all same height now)
+        y = (final_h - img.height) // 2
         canvas.paste(img, (x, y))
         x += img.width + spacing