Update

app.py

@@ -138,6 +138,9 @@ def line_color(image, mask, new_color):
 
 
 def main(image, lineart):
+    if image.mode != 'RGBA':
+        image = image.convert('RGBA')
+
     lineart = lineart.point(lambda x: 0 if x < 200 else 255)
     lineart = ImageOps.invert(lineart)
     kernel = np.ones((3, 3), np.uint8)
@@ -149,7 +152,7 @@ def main(image, lineart):
     new_color_1 = generate_distant_colors(major_colors, 100)
     filled_image = line_color(image, mask, new_color_1)
     replace_color_image = replace_color(filled_image, new_color_1, 2).convert('RGB')
-    return replace_color_image 
+    return replace_color_image
 
 
 # Gradioインターフェース用のメイン関数